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WO2007009931A1 - Procede et dispositif pour separer des matieres a mouler sous forme de pate - Google Patents

Procede et dispositif pour separer des matieres a mouler sous forme de pate Download PDF

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Publication number
WO2007009931A1
WO2007009931A1 PCT/EP2006/064184 EP2006064184W WO2007009931A1 WO 2007009931 A1 WO2007009931 A1 WO 2007009931A1 EP 2006064184 W EP2006064184 W EP 2006064184W WO 2007009931 A1 WO2007009931 A1 WO 2007009931A1
Authority
WO
WIPO (PCT)
Prior art keywords
openings
fluid film
fluid
pasty
dicing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2006/064184
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German (de)
English (en)
Inventor
Thomas Gerszewski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of WO2007009931A1 publication Critical patent/WO2007009931A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion

Definitions

  • the present invention relates to a process for dicing pasty molding compositions using an extrusion apparatus, wherein the molding compositions are extruded through a plurality of openings on a die plate, which is characterized in that the extruded, pasty molding compositions are separated by one or more fluid films the fluid film has a continuous volume flow with a parallel distribution over a distance of at least 5 cm, calculated from the place of origin of the fluid film. Furthermore, the invention relates to a device for dicing pasty molding compounds.
  • extrusion processes in which pasty masses are processed in an extrusion apparatus and brought into a form that is necessary in terms of process technology or application.
  • a die is usually attached to the exit of the extrusion apparatus, the geometry of which determines the diameter and the cross-sectional shape of the molding leaving the extrusion apparatus. In this way, for example, strands or
  • the extrusion devices are equipped with teeing devices which specifically cut to length an endless molding emerging from the extrusion device.
  • this cutting is accomplished by means of impact or cutting tools, these tools are usually made of metal, ceramic, plastic or corresponding composite materials.
  • JP 06 063937 describes a dicing device using an energy beam. This jet is located in the center of the circular extrusion orifices and breaks up the extrudates, in which the jet moves continuously in a circle over the extrudate openings.
  • EP-A 830 927 describes a process for cutting extrudates using water jets.
  • the water jets are generated by means of nozzles.
  • Several nozzles are arranged so that the water jets of each nozzle covered segment of the extrusion openings, in which the nozzles move alternately on a circular motion path.
  • US 3,846,529 discloses a method for cutting extrudates using a gas curtain.
  • the gas curtain is created by a nozzle and a subsequent deflector.
  • the distance from the deflector to the extrusion openings, i. the length of the extrudates, is flexibly adjustable.
  • US 5,063,002 describes a process for producing small particles of an elastomeric material.
  • the extrudates are crushed by means of an air system which has a sufficiently high speed, dried and discharged from the crushing chamber.
  • the gas source is at right angles to the extrusion orifices and is connected to the cutting chamber via a necked throat means so that the cross-sectional area of the throat means increases to those extrusion orifices closest to the exit region.
  • WO 2004/69507 describes a process for dicing a paste-like molding composition, in which the molding composition is brought into contact with a stream containing a fluid medium. It is disclosed that the flow is brought into contact with the molding compounds via outlet openings.
  • outlet openings nozzles are disclosed, in particular flat nozzles, wherein the resulting fluid film has a parabolic or trapezoidal distribution.
  • the object of the present invention was therefore to show a structurally simple method for cutting to length paste-like molding compositions that can be easily adjusted and cleaned and also guarantees a high throughput of extrudates. Another object was to replace the nozzles used in the prior art.
  • a method has been described for dicing pasty molding compositions using an extrusion device, wherein the molding compounds are separated by a plurality of openings. be extruded on a die plate found, which is characterized in that the extruded, pasty molding materials are separated by one or more fluid films, wherein the fluid film has a continuous volume flow with a parallel distribution over a distance of at least 5 cm, calculated from the Location of the fluid film having.
  • continuous as used in the context of the present invention in connection with the volume flow and the parallel distribution, comprises a deviation of 0 to 10 percent relative to a distance of 5 cm.
  • dicing comprises on the one hand process guides in which a part of the pasty molding composition is completely separated off. As an example of this complete separation is for example called the cutting to length of a molding compound. Likewise, the term “dicing” includes process guides in which said film is contacted with the molding compound such that the molding compound is not completely severed.
  • molding composition includes compositions which are subjected to at least one molding step.
  • process guides are included, in which the shaping step consists in that the molding composition is broken according to the invention.
  • the pasty molding composition can be subjected to at least one further shaping step. Further shaping steps are described for example in DE-A 103 04 611 in the text passages [0013] to [0015].
  • fluid film is understood as meaning all states of matter which lie below the conditions prevailing during dicing between ideal gas and solid and constitute a coherent film. Accordingly, the term “fluid” includes, for example, dense gases, liquids, melts or supercritical phases. Likewise, in the context of the present invention, finely divided solids in one or more gases or liquids, such as, for example, fluidized beds or magnetic liquids, constitute fluids. In the process according to the invention, gases or liquids are preferably used as fluids for producing the fluid film.
  • nitrogen can be used as the fluid.
  • a fluid film is conceivable, which consists of compressed air, which is also usually present on site in gas networks.
  • gases are up to Noble gases conceivable, wherein the stream may contain one or more gases or may consist of at least one gas.
  • air is used as the fluid.
  • air as used in the present invention is meant a gas or gas mixture consisting essentially of nitrogen, preferably with nitrogen contents of greater than or equal to 78% by volume, and substantially in each laboratory and every production facility operated on a technical or industrial scale is permanently installed. Depending on the source from which the air originates, their composition may vary within the limits known to those skilled in the art.
  • shaped catalyst bodies are produced in the process according to the invention, it is also conceivable to use a stream which comprises at least one reactive gas.
  • the surfaces that are formed by the dicing process can be oxidized by reactive gases such as oxygen or hydrogen can be reduced.
  • the stream used to break up the pasty molding material may contain two or more different fluids, for example two or more different gases or two or more different liquids being conceivable.
  • the fluid film has a volume flow per mm 2 of 0.0001 to
  • Nm 3 / mm 2 preferably 0.001 to 20 Nm 3 / mm 2 , particularly preferably 0.01 to
  • This volume flow is advantageously constant over a distance of at least 10 cm, in particular of at least 20 cm.
  • the fluid film with parallel distribution advantageously has a horizontal spread of 1 to 60 mm, preferably 1 to 40 mm, in particular 15 to 25 on.
  • the vertical spread of the fluid film is advantageously 0.1 to 20 mm, preferably 0.1 to 15 mm, in particular 0.3 to 5 mm.
  • the fluid film at a temperature of - 200 to 650 0 C, preferably from -20 to 100 0 C, in particular from 0 to 40 0 C.
  • the fluid film is generated under a pressure of 1 to 100 bar, preferably from 1 to 20 bar, in particular from 2 to 6 bar. If, for example, a liquid is preferably used as the fluid, pressures and temperatures are generally used which are selected analogously to those used in water-jet cutting.
  • the fluid film can be produced continuously or discontinuously, for example plus-wise, advantageously the fluid film is produced continuously.
  • the fluid film is advantageously produced by dividing a fluid stream by a plurality of slit-like openings arranged in a circle.
  • the fluid flow flows advantageously parallel, but in the opposite direction to the extruded molding compositions, in an inflow tube with a diameter of preferably 5 to 100 mm, preferably 20 to 30 mm.
  • the tube is advantageously located in the center of the die plate of the extrusion device. At the end of the inflow tube, 0 to 100 mm, preferably 2 to 20 mm, in front of the die plate, the tube has slot-like outlet openings.
  • the aforementioned slot-like outlet openings are advantageously located on a circle.
  • the outlet openings advantageously have a length, measured on the circumference of 1 to 60 mm, preferably from 1 to 40 mm, in particular 15 to 25, on.
  • the distance between the individual slot-like openings is advantageously 0 to 60 mm, preferably 0 to 40 mm, in particular 0 to 15 mm.
  • the outlet openings are advantageously 0.1 to 20 mm, preferably 0.1 to 15 mm, in particular 0.3 to 5 mm high.
  • the circle diameter on which the slot-like outlet openings are located is advantageously 10 to 1000 mm, preferably 20 to 300 mm, in particular 50 to 200 mm.
  • On the circle described are 1 to 25 slot-like outlet openings.
  • the fluid film is created over a single slot-like opening that makes up the entire circumference. Accordingly, a fluid film is formed, which is aligned perpendicular to the molding mass strands.
  • the inflow pipe is advantageously made of materials such as metals such as brass, acid-proof steel, heat-resistant steel, titanium, plastics such as polyvinyl chloride (PVC), polypropylene (PP) or Hastelloy, or two or more of these materials, especially stainless steel V2A.
  • metals such as brass, acid-proof steel, heat-resistant steel, titanium, plastics such as polyvinyl chloride (PVC), polypropylene (PP) or Hastelloy, or two or more of these materials, especially stainless steel V2A.
  • the distance between the slot-like outlet openings to the die plate can be easily adjusted over metal rings of different thickness.
  • the fluid film is advantageously 0 to 100 mm above the die plate, preferably 1 to 40 mm, in particular 3 to 15 mm.
  • the strands of the molding compound can be moved past the outlet openings at a constant feed rate and with the outflow Fluid film are brought into contact.
  • the frequency with which the fluid film is applied the length of the pieces can be controlled, which are separated from the respective strands. It is conceivable, inter alia, to also keep this pulse frequency constant at a constant feed rate of the strands, as a result of which strand pieces of the same length are obtained, for example. It is also possible to change the pulse frequency over time with a constant feed rate, whereby strand pieces of defined different lengths are obtained. It is also possible to change the feed rate continuously or discontinuously over time and to keep the pulse frequency constant or to change it continuously or discontinuously over time.
  • the die plate 1 to 50 openings for dies for extruding the pasty molding compositions.
  • Each individual die advantageously has 1 to 50 extruded openings, preferably 1 to 25 extrudate openings.
  • the extrudate openings suitably have a diameter of 0.5 to 50 mm, preferably 1 to 30 mm.
  • the openings are advantageously arranged on 1 to 2 circles around the fluid inflow pipe.
  • the distance between the centers of two adjacent openings for matrices on a circle is advantageously 20 to 80 mm.
  • 16 openings for matrices are arranged.
  • advantageously 16 to 800 strands are cut to length in parallel.
  • the method according to the invention it is thus possible to cut off a very large number of individual extrudates with a dicing process.
  • the slit-like fluid film openings and all the extrudate openings are advantageously in line in this case. 1 to 50, preferably 1 to 25 extrudates can be separated per fluid film.
  • per dicing operation using a conventional dicing device with, for example, a circular radius of the openings of the dies of 140 mm, 5 to 800 mm 2 , preferably 100 to 500 mm 2 extrudate mass can be divided.
  • the pasty molding compositions advantageously have a viscosity of 300 to 5000 N / cm 2 . Furthermore, the molding compositions have a density of 100 to 1500 g / l, preferably 300 to 1400 g / l.
  • the diameter of the strands of pasty molding compositions is advantageously from 0.5 to 50 mm, preferably from 1 to 30 mm, in particular from 1.5 to 25 mm.
  • Such pasty molding compositions are obtained, for example, in the production or mass production of plastic products, pharmaceutical products, cleaning and personal care products, food products, animal feeds or catalysts.
  • shaped catalyst bodies is to be understood as meaning shaped bodies which serve as a finished catalyst or as a catalyst precursor.
  • catalyst form bodies may have at least one further, non-catalytically active constituent which, in the case of a catalyst precursor, may be removed from the shaped body, for example in at least one further treatment step, for example in a thermal treatment or a chemical reaction.
  • catalysts examples include oxidation, hydrogenation, deoxidation, epoxidation, amination, alkylation, purification or reforming catalysts.
  • catalysts for the removal of nitrogen oxides NO x or for the decomposition of N 2 O may be mentioned.
  • the fluid in particular using a liquid, is collected after the dicing step and recycled to the process.
  • the fluid may be subjected to one or more suitable purification steps or treatment steps prior to recycling.
  • the present invention in contrast to the prior art, a structurally simple method for cutting to length pasty molding compositions.
  • the matrices which have to be changed every few hours due to the abrasive material, are easy to remove and reinsert without the need for expensive (dis) assembly of the fluid film assembly. Furthermore, there is no need to re-adjust the fluid film arrangement after the die change, as is the case, for example, when changing nozzles.
  • significantly more mold strands per unit time can be cut to length, since a) the spatial distribution of the die openings could be optimized and b) the fluid film has a separation force over a distance of several die openings due to the parallel distribution.
  • the mold strands are already dried by the fluid film, so that, for example, the mold strands do not stick to other strands when falling onto a conveyor belt.
  • the invention relates to an apparatus for severing paste pasty masses with an extrusion device with a die plate having a plurality of extrudate openings, emerge from the extruded molding compounds through the openings, and with a fluid source which is arranged in the center of the die plate, wherein the Fluid exits through slit-like outlet openings, which are arranged in a circle.
  • Fig. 1 is a schematic representation of a plan view of the device according to the invention
  • Fig. 2 is a schematic representation of a side view of the device according to the invention
  • the device according to the invention has an extruder 6 with an extruder screw 7. Via the extruder 6, the pasty molding compounds reach the die plate 3, which has a plurality of openings for dies. Each die has a plurality of extrudate openings 4. The openings for dies are arranged in the form of several circles on the die plate 3. The fluid passes through the inflow pipe 5 to the center of the die plate. There, it emerges through slit-like outlet openings 1, which are arranged in a circle on the inflow pipe 5, and forms a fluid film 2.
  • Comparative example according to WO 2004/69507 Using the special jet nozzles mentioned in WO 2004/69507 (Schlick Co., designation 19828), a device for dicing pasty molding compositions was constructed, which was optimized for a circle radius of the openings for dies of 140 mm. In order to realize a uniform cutting, 8 openings for dies with a diameter of 23.8 mm on the circle radius of 140 mm could be used. Each die had 12 extrudate openings. Per extrusion process 96 extrudates could be produced.
  • Inventive Example 1 For comparison, a device for dicing pasty molding compositions was constructed using the method according to the invention, which was also optimized for a circle radius of the openings for matrices of 140 mm. In order to realize an even cutting, 12 openings for dies with a diameter of 23.8 mm on the circle radius of 140 mm could be used. Each die had 12 extrudate openings.
  • a device for dicing pasty molding compounds was constructed using the method of the invention, which was also optimized for a circle radius of the openings for matrices of 140 mm.
  • 12 openings for dies with a diameter of 23.8 mm on the circle radius of 140 mm could be used.
  • another 12 holes for matrices could be used on another circle with a radius of 180 mm.
  • Each die had 12 extrudate openings. Per extrusion process 288 extrudates could be produced.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé pour séparer des matières à mouler sous forme de pâte, en utilisant un dispositif d'extrusion. Les matières à mouler sont extrudées à travers une pluralité d'ouvertures sur un support de matrice. Cette invention est caractérisée en ce que les matières à mouler extrudées sous forme de pâte sont séparées par un ou plusieurs films fluidiques. Un film fluidique présente un débit volumétrique continu avec une répartition parallèle sur une distance d'au moins 5 cm, calculé depuis le point d'origine du film fluidique. Cette invention concerne également un dispositif conçu pour séparer des matières à mouler sous forme de pâte.
PCT/EP2006/064184 2005-07-22 2006-07-13 Procede et dispositif pour separer des matieres a mouler sous forme de pate Ceased WO2007009931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005035001 2005-07-22
DE102005035001.1 2005-07-22

Publications (1)

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WO2007009931A1 true WO2007009931A1 (fr) 2007-01-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112755917A (zh) * 2020-12-29 2021-05-07 江苏省镔鑫钢铁集团有限公司 一种利用高铁废固制备燃煤催化剂的方法及其制备设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10304611A1 (de) * 2003-02-05 2004-08-19 Basf Ag Verfahren und Vorrichtung zur Zertrennung pastöser Formmassen
US20040164435A1 (en) * 2000-08-03 2004-08-26 The Procter & Gamble Company Methods and apparatus for producing granular compositions
US20050077644A1 (en) * 2003-08-14 2005-04-14 Bryan David E. High pressure liquid jet cutting system and method for forming polymer pellets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040164435A1 (en) * 2000-08-03 2004-08-26 The Procter & Gamble Company Methods and apparatus for producing granular compositions
DE10304611A1 (de) * 2003-02-05 2004-08-19 Basf Ag Verfahren und Vorrichtung zur Zertrennung pastöser Formmassen
US20050077644A1 (en) * 2003-08-14 2005-04-14 Bryan David E. High pressure liquid jet cutting system and method for forming polymer pellets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112755917A (zh) * 2020-12-29 2021-05-07 江苏省镔鑫钢铁集团有限公司 一种利用高铁废固制备燃煤催化剂的方法及其制备设备

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