JP2012228679A - Porous membrane treatment apparatus - Google Patents

Abstract

To provide a porous membrane processing apparatus capable of simplifying an operation for preventing a chemical solution from coming into contact with a porous membrane when the chemical processing is stopped.
A hollow fiber membrane treatment apparatus of the present invention is used in a chemical solution treatment step of a porous membrane or a porous membrane precursor. A treatment tank 10 containing a chemical solution B and an outer side of the treatment vessel 10 are used. The first guide is installed so that the transport direction of the porous membrane (hollow fiber membrane A) or the porous membrane precursor is rotated and the porous membrane or the porous membrane precursor is run so as to be immersed in the chemical solution B. The second guide for moving the means 12a and the porous film or the porous film precursor traveling in the chemical solution B so as to move the porous film or the porous film precursor so as to be pulled up on the liquid surface. Means 12b and a support member 13 that supports the first guide means 12a and the second guide means 12b, respectively, and is movable up and down.
[Selection] Figure 1

Description

  The present invention relates to a porous film processing apparatus for processing a porous film with a chemical solution containing an oxidizing agent.

In recent years, due to increasing interest in environmental pollution and stricter regulations, a method using a porous membrane filtration membrane excellent in separation completeness and compactness has attracted attention as a water treatment method.
As a method for producing a porous membrane, a non-solvent phase separation method using a non-solvent phase separation phenomenon in which a polymer solution is made to be porous by phase separation with a non-solvent is known.
When producing a porous membrane using a non-solvent phase separation method, a film-forming stock solution containing a hydrophobic polymer, a hydrophilic polymer, and a solvent is discharged from a discharge port (spinning nozzle, T-die, etc.), and a coagulation liquid Solidify in to obtain a porous membrane precursor (hollow fiber etc.).
In the porous membrane precursor formed by the coagulation step, a large amount of hydrophilic polymer and solvent in the solution state remain. If a large amount of the hydrophilic polymer remains in the porous film obtained thereafter, the water permeability is impaired, and if the hydrophilic polymer is dried in the porous film, the mechanical strength of the film may be reduced. is there. Therefore, after the coagulation step, the hydrophilic polymer remaining in the porous membrane is usually immersed in a chemical solution containing an oxidizing agent such as hypochlorous acid, then heated to decompose, washed, and hydrophilic. A treatment for sufficiently removing the polymer is performed (Patent Documents 1 and 2).
In the above treatment method, when the hydrophilic polymer is immersed in the chemical solution, for example, a treatment tank in which the chemical solution is put, a guide roll that runs so that the porous film is immersed in the chemical solution, and the guide roll are supported. A thing provided with a supporting member is widely used.

JP-A-2-302449 JP-A-2005-220202

In the above processing apparatus, the porous film remains immersed in the chemical solution when the chemical solution treatment is stopped. When the porous membrane is immersed in the chemical solution, the chemical solution penetrates into the porous membrane, and therefore, when the operation is restarted, the porous membrane in which the chemical solution is immersed is sent to the next step. For this reason, the oxidant soaked in the porous film may corrode the next process apparatus. Therefore, conventionally, when the treatment is stopped, the porous membrane is cut so that the porous membrane does not come into contact with the chemical solution, and when the treatment is resumed, the porous membrane is applied again to the guide roll. However, the work was complicated.
An object of this invention is to provide the porous membrane processing apparatus which can simplify the operation | work which prevents a chemical | medical solution from contacting a porous membrane at the time of a chemical | medical solution processing stop.

The present invention has the following aspects.
[1] A porous membrane processing apparatus used in a chemical treatment process of a porous membrane or a porous membrane precursor, the treatment vessel containing a chemical solution, and a porous membrane installed outside the treatment vessel Alternatively, the first guide means for moving the porous film precursor in a moving direction by rotating the transport direction of the porous film precursor and soaking the porous film or the porous film precursor in the chemical solution, and the porous film or porous material traveling in the chemical solution A second guide means for rotating the transport direction of the membrane precursor to move the porous membrane or the porous membrane precursor so as to pull up on the liquid surface; the first guide means; and the second guide A porous membrane processing apparatus comprising a supporting member that supports each means and is movable up and down.
[2] The treatment tank includes a partition plate that divides the inside of the treatment tank into a plurality of chambers so that the chemical solution can move, and the chemical solution is upstream from the downstream side in the transfer direction of the porous membrane or the porous membrane precursor. The porous membrane processing apparatus according to [1], which moves toward the side.
[3] The porous membrane processing apparatus according to [2], wherein each of the second guide means is arranged in each cleaning chamber in a processing tank formed by being partitioned by the partition plate. .
[4] The porous material according to any one of [1] to [3], wherein each of the first guide unit and the second guide unit includes a guide roll made of a free roll having a diameter of 80 mm or more. Membrane processing equipment.
[5] The porous membrane treatment according to [4], wherein the bearing attached to the guide roll includes an outer ring and an inner ring made of polyetheretherketone, and a rotary bearing having a retainer whose surface is coated with fluororesin or fluororesin. apparatus.
[6] The porous film processing apparatus according to [5], wherein the rotary bearing has a silicon carbide ceramic ball bearing.
[7] The porous membrane treatment apparatus according to any one of [1] to [6], wherein the treatment tank is made of titanium.
[8] The porous membrane processing apparatus according to any one of [1] to [7], wherein a cooler is provided inside the processing tank.

According to the porous membrane treatment apparatus of the present invention, it is possible to simplify the operation of preventing the chemical solution from coming into contact with the porous membrane when the chemical treatment is stopped.
In the porous membrane treatment apparatus of the present invention, the treatment tank has a partition plate that divides the interior into a plurality of chambers so that the chemical solution can move, and the chemical solution is transferred in the direction of the porous membrane or the porous membrane precursor. If it moves from the downstream side to the upstream side, the chemical solution can be efficiently brought into contact with the porous membrane and permeated.
If one second guide means is arranged in each cleaning chamber in the processing tank formed by partitioning with the partition plate, the chemical solution is more efficiently brought into contact with the porous membrane and permeated. Can do.
Further, when both the first guide means and the second guide means are constituted by guide rolls made of free rolls having a diameter of 80 mm or more, it is possible to prevent the porous film from being deformed, such as thinning and flattening.
If the bearing attached to the guide roll has an outer ring and an inner ring made of polyetheretherketone and a rotary bearing having a retainer made of fluororesin or surface-coated with fluororesin, it is possible to further prevent the porous membrane from being deformed. .
Further, if the rotary bearing has a silicon carbide ceramic ball bearing, wear can be suppressed.
Moreover, if the treatment tank is made of titanium, the generation of rust can be prevented.
Moreover, if a cooler is provided inside the treatment tank, a sufficient amount of active oxidant can be retained in the porous membrane.

It is a schematic diagram which shows one Embodiment of the porous membrane processing apparatus of this invention. It is a top view which shows the processing tank which comprises the porous membrane processing apparatus of FIG. FIG. 2 is a schematic view showing an aspect in which a support member is raised in a chemical solution immersion part that constitutes the porous membrane treatment apparatus of FIG. 1.

An embodiment of the porous membrane treatment apparatus of the present invention will be described as an example of the treatment of the hollow fiber membrane.
In FIG. 1, the schematic diagram of the porous membrane processing apparatus of this embodiment is shown. The porous film processing apparatus 1 of the present embodiment includes a chemical solution immersion unit 10, a heating unit 20, a cleaning unit 30, and a drying unit 40.

(Chemical solution immersion part)
The chemical solution immersion unit 10 in the present embodiment includes a treatment tank 11 in which the chemical solution B is placed, a first guide unit 12a that guides the hollow fiber membrane A so that the hollow fiber membrane A is immersed in the chemical solution a plurality of times, and a first guide unit 12a. 2 guide means 12b, a support member 13 that supports the first guide means 12a and the second guide means 12b, a cooler 14 provided inside the processing tank 11, and a chemical solution B are supplied to the processing tank 11. A chemical solution supply pipe 15 for discharging the chemical solution B from the processing tank 11 is provided.

In this embodiment, the processing tank 11 has a substantially rectangular parallelepiped shape, and has partition plates 11a and 11b that divide the inside thereof into a plurality of cleaning chambers so that the chemical solution B can move, and the chemical solution B is formed of the hollow fiber membrane A. It moves from the downstream side in the transfer direction toward the upstream side. As shown in FIG. 2, the processing tank 11 in this embodiment has a rectangular opening 11c in a top view, and both side walls (first side wall 11d, second side wall) along the longitudinal direction of the opening 11c. A plurality of partition plates 11a and 11b are attached perpendicular to 11e). The length of the partition plates 11a and 11b is shorter than the length between the first side wall 11d and the second side wall 11e. Thereby, the clearance gap is formed between the partition plate 11a and the 2nd side wall 11e, and between the partition plate 11b and the 1st side wall 11d. Further, the partition plates 11a attached to the first side wall 11d and the partition plates 11b attached to the second side wall 11e are alternately arranged.
In such a processing tank 11, the chemical solution B moves from the downstream side in the transfer direction of the hollow fiber membrane A toward the upstream side while meandering along the partition plates 11a and 11b.
Moreover, the processing tank 11 is made of a material having corrosion resistance, and titanium is particularly preferable. If the treatment tank 11 is made of titanium, the corrosion prevention effect is high and the generation of rust can be suppressed. Therefore, the deterioration of the treatment tank 11 can be suppressed, and the hollow fiber membrane A can be prevented from being damaged due to contact with rust.

The first guide means 12a in the present embodiment is a plurality of rolls provided above the liquid surface 11f of the chemical solution B, and is provided above the partition plates 11a and 11b. The second guide means 12b is a plurality of rolls provided so as to be positioned below the liquid surface 11f of the chemical solution B in the processing tank 11, and is a cleaning chamber formed by being partitioned by the partition plates 11a and 11b. 11g inside.
By hollowing the hollow fiber membrane A alternately on the first guide means 12a and the second guide means 12b and reversing the transfer direction, the hollow fiber membrane A is transferred while reciprocating in the vertical direction, The immersion of the hollow fiber membrane A in the chemical solution B and the pulling up of the hollow fiber membrane A from the chemical solution B are repeated. Thereby, the hollow fiber membrane A is immersed in the chemical solution B a plurality of times.

The first guide means 12a and the second guide means 12b in the present embodiment are preferably free rolls having a diameter of 80 mm or more, and more preferably 90 mm or more. Here, the free roll is a roll to which drive means such as a motor is not attached.
If the diameter of the first guide means 12a and the second guide means 12b is 80 mm or more, the tension applied to the hollow fiber membrane A can be suppressed, and the hollow fiber membrane can be deformed such as thinning and flattening. Can be prevented. In terms of practicality, the diameters of the first guide means 12a and the second guide means 12b are preferably 100 mm or less.
The bearings attached to the first guide means 12a and the second guide means 12b are excellent in scratch resistance such as polyether ether ketone (PEEK) resin, polyamide (PA) resin, polyimide (PI) resin, etc. It is preferable to include an outer ring and an inner ring made of the same member, and a rotary bearing having a retainer made of fluororesin or whose surface is coated with fluororesin. Among these, since it is excellent in oxidant resistance, which will be described later, and is difficult to break even when a chemical solution containing an oxidant is used, it is preferable to use a polyether ether ketone resin for the outer ring and the inner ring. It is preferable to use tetrafluoroethylene (PTFE) resin.
If the bearing is as described above, it is difficult to wear, the bearing replacement frequency can be reduced, and an increase in tension due to poor rotation can be suppressed. And flattening) can be further prevented.
Examples of the rotary bearing include a ball bearing. In the case of using a ball bearing, it is preferable to use a ceramic, particularly a silicon carbide ceramic, for the bearing ball from the viewpoint of wear resistance.

  The support member 13 supports the first guide means 12a and the second guide means 12b, and can move up and down. Thereby, the 2nd guide means 12b can be immersed in the chemical | medical solution B in the processing tank 11, or the 2nd guide means 12b can be pulled up from the chemical | medical solution B as shown in FIG. The vertical movement of the support member 13 may be automatic or manual, but is preferably automatic in terms of making the operation easier.

The cooler 14 can be cooled by flowing a coolant such as cooling water. In the present embodiment, the cooler 14, the cleaning chamber 11g ₁ of the most downstream side in the transport direction of the hollow fiber membrane A (the most upstream side of the drug solution B), the partition plate 11a, are mounted in parallel and 11b. The material of the cooler 14 is preferably titanium from the viewpoint of corrosion resistance.
Chemical liquid supply pipe 15 is attached to the cleaning chamber 11g ₁ of the most downstream side in the transport direction of the hollow fiber membrane A, the drug solution discharge tube 16 is attached to the cleaning chamber 11g ₂ of the most upstream side in the transport direction of the hollow fiber membrane A It has been.

(Heating section)
The heating unit 20 in the present embodiment includes a heating container 21, a heating unit 22 provided inside the heating container 21, and a guide unit 23 that guides the traveling direction of the hollow fiber membrane A inside the heating container 21. Prepare.
The heating means 22 in the present embodiment is composed of steam jetting means for jetting heating steam such as steam, and heats the inside of the heating container 21 with steam. As the steam jetting means, one in which a plurality of jet ports 22b are formed in a pipe 22a supplied with steam is used.
The guide means 23 includes an upper guide roll 23 a disposed on the upper side of the heating container 21 and a lower guide roll 23 b disposed on the lower side of the heating container 21. A plurality of upper guide rolls 23a and lower guide rolls 23b are provided, and the hollow fiber membrane A is alternately wound around the upper guide rolls 23a and the lower guide rolls 23b. In such a guide means 23, the hollow fiber membrane A is transferred while reversing the transfer direction of the hollow fiber membrane A so that the transfer direction of the hollow fiber membrane A becomes the vertical direction.

  In the heating unit 20, the inside of the heating container 21 is heated by ejecting steam from the heating means 22, and the hollow fiber membrane A traveling by the guide means 23 can be heated in the gas phase.

(Washing part)
The cleaning unit 30 in this embodiment includes a cleaning tank 31 in which the cleaning liquid C is placed, a first vacuum cleaning unit 32, a pressure cleaning unit 33, a second vacuum cleaning unit 34, and a guide roll 35. The first vacuum cleaning means 32, the pressure cleaning means 33 and the second vacuum cleaning means 34 are immersed in the cleaning liquid C in the cleaning tank 31. Further, the first reduced pressure cleaning means 32, the pressure cleaning means 33, and the second reduced pressure cleaning means 34 are arranged in this order from the upstream side.
Vacuum pumps 32a and 34a are connected to the first vacuum washing means 32 and the second vacuum washing means 34, and the outside of the hollow fiber membrane A is decompressed by the vacuum pumps 32a and 34a, so that the inside of the hollow fiber membrane A can be reduced. A hydrophilic polymer aqueous solution is discharged to the outside of the hollow fiber membrane A.
A pressurizing pump 33a is connected to the pressurizing and cleaning means 33, and the pressurizing pump 33a pressurizes the outside of the hollow fiber membrane A so that the cleaning liquid C is introduced into the hollow fiber membrane A from the outside of the hollow fiber membrane A. It comes to press fit.
The guide roll 35 is arranged so that the hollow fiber membrane A travels in the cleaning tank 31 and travels inside the first reduced pressure cleaning means 32, the pressure cleaning means 33 and the second reduced pressure cleaning means 34.

(Drying part)
The drying unit 40 is for drying the hollow fiber membrane A washed by the washing unit 30. Specifically, a hot air dryer, a vacuum dryer, etc. are mentioned.
A winding means such as a bobbin for winding the hollow fiber membrane A may be provided on the downstream side of the drying unit 40.

(Method of treating hollow fiber membrane)
An example of the processing method of the hollow fiber membrane using the said processing apparatus is demonstrated.
This processing example includes a chemical solution immersion process, a heating process, a cleaning process, and a drying process.

[Chemical processing process]
In the chemical treatment process, the hollow fiber membrane A in which the hydrophilic polymer remains is immersed in the chemical B.
Specifically, through the chemical liquid supply pipe 15 and the chemical solution B was supplied to the cleaning chamber 11g ₁ of the treatment tank 11, the partition plate 11a, while meandering partitioned processing bath 11 by 11b, from the cleaning chamber 11g ₁ It is moved toward the cleaning chamber 11g _2.
At the same time, the support member 13 is lowered to immerse the second guide means 12 b in the chemical solution B in the treatment tank 11. Next, the hollow fiber membrane A is transferred while reciprocating between the first guide means 12a and the second guide means 12b. As a result, while the hollow fiber membrane A is traveling, the immersion of the hollow fiber membrane A into the chemical solution B and the pulling up of the hollow fiber membrane A from the chemical solution B are repeated, so that the chemical solution B penetrates into the hollow fiber membrane A.
When the chemical treatment process is stopped, as shown in FIG. 3, the support member 13 is raised, the second guide means 12b is pulled up from the chemical B in the treatment tank 11, and the hollow fiber membrane A is changed to the chemical B. Avoid immersion.

  Examples of the oxidizing agent contained in the chemical solution B include ozone, hydrogen peroxide, permanganate, dichromate, and persulfate. Of these, hypochlorite is preferable from the viewpoints of strong oxidizing power, excellent decomposition performance, excellent handleability, and low cost. Examples of the hypochlorite include sodium hypochlorite and calcium hypochlorite. Among them, sodium hypochlorite is preferable.

The temperature of the chemical solution B is preferably 50 ° C. or less, and more preferably 30 ° C. or less. When the chemical temperature is 50 ° C. or lower, the oxidative decomposition of the hydrophilic polymer in the treatment tank 11 can be suppressed, and the consumption of the oxidizing agent can be suppressed. The chemical liquid B can be cooled by the cooler 14.
However, if the temperature is excessively low, the oxidative decomposition is suppressed, but the cost required for temperature control tends to increase. Therefore, the temperature of the chemical solution B is preferably 0 ° C. or higher, and more preferably 10 ° C. or higher.

In this example, the hollow fiber membrane was obtained by discharging a membrane forming stock solution containing a hydrophobic polymer, a hydrophilic polymer and a solvent for dissolving them from a spinning nozzle, coagulating with a coagulating solution, and washing as necessary. It may be a sufficiently porous film, or may be a precursor that is not sufficiently formed into a porous film.
The film-forming stock solution may be discharged onto the peripheral surface of the hollow string-like support fed from the spinning nozzle. As the hollow string-like support, a knitted string or a braided string can be used. Synthetic fibers, semi-synthetic fibers, regenerated fibers, natural fibers, and the like are examples of fibers constituting the braided or braided string. The form of the fiber may be any of monofilament, multifilament, and spun yarn.

Examples of the hydrophobic polymer include polysulfone resins such as polysulfone and polyethersulfone, fluorine resins such as polyvinylidene fluoride, polyacrylonitrile, cellulose derivatives, polyamide, polyester, polymethacrylate, and polyacrylate. Moreover, these copolymers may be sufficient. A hydrophobic polymer may be used alone or in combination of two or more.
Among the hydrophobic polymers, a fluorine-based resin is preferable from the viewpoint of excellent durability against an oxidizing agent such as hypochlorous acid, and a polyvinylidene fluoride or a copolymer of vinylidene fluoride and another monomer is preferable. .
The hydrophilic polymer is added to adjust the viscosity of the membrane-forming stock solution to a range suitable for the formation of the hollow fiber membrane and stabilize the membrane-forming state. Polyethylene glycol, polyvinyl pyrrolidone, etc. are preferable. used. Among these, polyvinylpyrrolidone and a copolymer obtained by copolymerizing other monomers with polyvinylpyrrolidone are preferable from the viewpoint of controlling the pore diameter of the hollow fiber membrane and the strength of the hollow fiber membrane.
Examples of the solvent include N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, N-methyl-2-pyrrolidone, N-methylmorpholine-N-oxide, and one or more of these can be used. Moreover, you may mix and use the poor solvent of a hydrophobic polymer or a hydrophilic polymer in the range which does not impair the solubility of the hydrophobic polymer or hydrophilic polymer to a solvent.

[Heating process]
In the heating step, the hollow fiber membrane A infiltrated with the chemical solution is heated in the gas phase by the heating unit 20, and the hydrophilic polymer is oxidized and decomposed to reduce the molecular weight.
Specifically, first, steam such as water vapor is ejected from the ejection port 22b of the heating means 22, and the inside of the heating container 21 is heated by the steam. Next, the hollow fiber membrane A infiltrated with the chemical solution B is wound while being alternately wound around the upper guide roll 23a and the lower guide roll 23b, thereby being transferred while reciprocating in the vertical direction. Thereby, the hollow fiber membrane A which the chemical | medical solution B osmose | permeated runs inside the heating container 21 heated.

The relative humidity inside the heating container 21 is preferably 80% or more, more preferably 90% or more, and is preferably close to 100%, since drying of the oxidizing agent can be prevented and oxidative decomposition of the hydrophilic polymer can be promoted. Most preferred.
The lower limit of the heating temperature is preferably 50 ° C., more preferably 80 ° C., because the heat treatment time can be shortened. The upper limit of the heating temperature is preferably 100 ° C. in the atmospheric pressure state. Here, the heating temperature is the temperature in the heating container 21.

  As described above, in the heating step of the present embodiment in which the hollow fiber membrane A is heated in the gas phase, the hollow fiber membrane A in which the chemical solution B has permeated is caused to travel inside the heated heating container 21, thereby forming the hollow fiber. The hydrophilic polymer remaining in the film A is oxidatively decomposed by the oxidizing agent in the chemical solution B. In the heating step, the chemical solution B that has penetrated into the hollow fiber membrane A is difficult to dilute, and the chemical solution B is difficult to flow out into the heating medium, so that the oxidizing agent in the chemical solution B remains in the hollow fiber membrane A. It can be efficiently used for decomposing hydrophilic polymers.

[Washing process]
In the washing step, the hollow fiber membrane A is washed while passing through the first reduced pressure washing means 32, the pressure washing means 33, and the second reduced pressure washing means 34 to remove the hydrophilic polymer.
Specifically, the hollow fiber membrane A is caused to travel inside the first reduced pressure cleaning means 32, the pressure cleaning means 33 and the second reduced pressure cleaning means 34 in the cleaning tank 31 by the guide roll 35.
In the first reduced pressure washing means 32, the outside of the hollow fiber membrane A is decompressed by the vacuum pump 32a, thereby discharging the hydrophilic polymer aqueous solution inside the hollow fiber membrane A to the outside of the hollow fiber membrane A.
In the pressure washing means 33, the outside of the hollow fiber membrane A is pressurized by the pressure pump 33a, so that the washing liquid C is pressed into the hollow fiber membrane A from the outside of the hollow fiber membrane A, and the hydrophilic polymer is washed with the washing liquid C. Replace and dilute.
In the second reduced pressure washing means 34, the outside of the hollow fiber membrane A is again decompressed by the vacuum pump 34a, and the hydrophilic polymer aqueous solution inside the hollow fiber membrane A is discharged to the outside of the hollow fiber membrane A.
Thereby, the hydrophilic polymer is removed from the hollow fiber membrane A.

[Drying process]
There is no restriction | limiting in particular as a method of a drying process, Hot air drying, vacuum drying, etc. can be applied. After the drying step, the dried hollow fiber membrane may be wound on a winding means such as a bobbin.

(Function and effect)
In the above-described embodiment, the chemical solution B is infiltrated into the hollow fiber membrane A at the chemical solution immersion unit 10, and the hollow fiber membrane A infiltrated with the chemical solution B is heated at the heating unit 20 to remain in the hollow fiber membrane A. The hydrophilic polymer is made to have a low molecular weight, and the washing unit 30 cleans the hollow fiber membrane A to remove the low molecular weight hydrophilic polymer.
In the chemical solution immersion part 10, the support member 13 moves up and down. During the chemical solution treatment, the support member 13 can be lowered and the hollow fiber membrane A can be immersed in the chemical solution B. When the treatment is stopped, the support member 13 can be raised so that the hollow fiber membrane A is not immersed in the chemical solution B. Therefore, the work for cutting the hollow fiber membrane A and the work for applying the hollow fiber membrane A to the first guide means 12a and the second guide means 12b at the time of resumption are not required. It is possible to simplify the work of preventing contact. Furthermore, by raising the support member 13, the entire hollow fiber membrane A immersed in the chemical solution B can be quickly pulled up from the chemical solution B.
Moreover, in the said chemical | medical solution immersion part 10, the chemical | medical solution B is moved toward the upstream from the downstream of the transfer direction of the hollow fiber membrane A, and an oxidizing agent density | concentration is so high that it is downstream of the hollow fiber membrane A. It comes in contact with the chemical solution B. Therefore, it is easy to make the oxidant concentration in the hollow fiber membrane A after the chemical solution immersion step constant. Furthermore, since the flow of the chemical solution B is meandered by the partition plates 11a and 11b to increase the residence time, the chemical solution B can be efficiently brought into contact with the hollow fiber membrane A and permeated.
Moreover, in the said chemical | medical solution immersion part 10, the chemical | medical solution inside the processing tank 11 can be cooled with the cooler 14. FIG. When the chemical solution B is cooled, the reaction between the hydrophilic polymer remaining in the hollow fiber membrane A and the hydrophilic polymer dropped off from the hollow fiber membrane A and the oxidizing agent contained in the chemical solution B can be suppressed. Therefore, a sufficient amount of active oxidant can be retained in the hollow fiber membrane A transferred to the heating unit 20.

(Other embodiments)
In addition, this invention is not limited to the said embodiment.
For example, in a chemical | medical solution immersion part, a processing tank does not need to be partitioned off with a partition plate. Alternatively, the hollow fiber membrane may be immersed once without being repeatedly immersed in the chemical solution. Moreover, you may move a chemical | medical solution from the upstream of the transfer direction of a hollow fiber membrane to the downstream.
Moreover, the chemical | medical solution immersion part may be equipped with a cooler in several washing | cleaning chambers, and does not need to equip all the washing | cleaning rooms with a cooler.
The heating unit may be a unit that heats the hollow fiber membrane by spraying steam directly.
Moreover, although the washing | cleaning part in the said embodiment was equipped with the pressure reduction washing | cleaning means in the upstream and downstream of a pressure washing means, you may be only upstream or downstream. Moreover, you may further provide a pressure washing | cleaning means and a pressure reduction washing means downstream from the 2nd pressure reduction washing | cleaning means. Further, only the vacuum cleaning means or the pressure cleaning means may be used.
Further, the treatment apparatus of the present invention can be applied not only to a hollow fiber membrane but also to a flat membrane such as a film membrane.

10 chemical immersion unit 11 processing tank 11a, 11b partition plate 11c opening 11d first sidewall 11e second side wall 11f liquid surface _11g, 11g 1, 11g ₂ cleaning chamber 12a first guide means 12b second guide means 13 supporting member DESCRIPTION OF SYMBOLS 14 Cooler 15 Chemical solution supply pipe 16 Chemical solution discharge pipe 20 Heating part 21 Heating container 22 Heating means 22a Piping 22b Spout 23 Guide means 23a Upper guide roll 23b Lower guide roll 30 Washing part 31 Cleaning tank 32 1st pressure reduction washing means 32a Vacuum Pump 33 Pressure cleaning means 33a Pressure pump 34 Second decompression cleaning means 34a Vacuum pump 35 Guide roll 40 Drying part A Hollow fiber membrane B Chemical liquid C Cleaning liquid

Claims (8)

An apparatus for treating a porous membrane used in a chemical solution treatment step of a porous membrane or a porous membrane precursor,
A treatment tank containing a chemical solution;
First guide means installed on the outside of the processing tank, which moves the porous film or the porous film precursor so as to immerse the porous film or the porous film precursor in the chemical solution by turning the transfer direction of the porous film or the porous film precursor. When,
A second guide means for moving the porous film or the porous film precursor traveling in the chemical solution so as to move the porous film or the porous film precursor so as to be pulled up on the liquid surface;
A porous membrane processing apparatus comprising a support member that supports the first guide means and the second guide means and is movable up and down.   The treatment tank has a partition plate for partitioning the inside thereof into a plurality of chambers so that the chemical solution can move, and the chemical solution is directed from the downstream side to the upstream side in the transfer direction of the porous membrane or the porous membrane precursor. The porous film processing apparatus according to claim 1, wherein the apparatus is configured to move.   3. The porous membrane processing apparatus according to claim 2, wherein one second guide means is arranged in each cleaning chamber in a processing tank formed by being partitioned by the partition plate. 4.   The porous membrane processing apparatus according to any one of claims 1 to 3, wherein each of the first guide means and the second guide means is configured by a guide roll made of a free roll having a diameter of 80 mm or more.   The porous membrane processing apparatus of Claim 4 with which the bearing attached to a guide roll is provided with the outer ring | wheel and inner ring | wheel made from polyetheretherketone, and the rotating bearing which has a retainer which made the surface made of fluororesin or fluororesin.   The porous film processing apparatus according to claim 5, wherein the rotary bearing has a silicon carbide ceramic ball bearing.   The porous membrane treatment apparatus according to any one of claims 1 to 6, wherein the treatment tank is made of titanium.   The porous membrane processing apparatus of any one of Claims 1-7 by which the cooler is provided in the inside of the said processing tank.

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