JPH03196801A - Device for removing volatile material in low viscosity material - Google Patents

Abstract

PURPOSE:To efficiently remove the volatile material as impurities in a low viscosity fluid material with good heat-exchange efficiency and in a short time by using a plate-fin heat exchanger high in heat transfer density. CONSTITUTION:The plate-fin heat exchanger 3 having the feed pipe 7 and discharge pipe 8 for a heating medium H is provided in a drum main body 1 capable of being depressurized or pressurized. A low-viscosity fluid F is supplied to the heat exchanger H, heated therein, accumulated at the lower part of the main body 1 to form a liq. surface W and discharged from a discharge nozzle 19 at the lower part. Consequently, the volatile material B as impurities contained in the fluid F is removed from a discharge port 20 with high heat- exchange efficiency and in a short time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention removes volatile impurities mainly contained in low-viscosity substances in a short residence time by devolatilizing them while heating. The present invention relates to an apparatus for removing volatile substances from low-viscosity substances, which is used to improve the quality of the low-viscosity substances.

[Conventional technology]

Conventionally, in volatile substance removal equipment for highly viscous substances, for example, polymers such as styrene polymers sent out from the polymerization process usually contain volatile substances such as unreacted monomers and solvents. However, since these volatile substances reduce or deteriorate the quality of the polymer and further deteriorate the quality of the products obtained from this polymer, it is necessary to remove them as soon as possible.

As a device for removing such volatile substances, an invention was developed in which a polymer is foamed and dispersed, then passed through a vertical multi-tubular heat exchanger to raise the temperature, and then flashed in a gas-liquid separation area (Japanese Patent Publication No. 4).
Publication No. 8-297.97 and JP-A-51-134781
However, in these cases, the disadvantage is that the apparatus as a whole becomes large and complicated.

In addition, a thin film type method uses mechanical stirring to press a highly viscous substance containing impurities onto the internal surface of a cylinder heated from the outside, spreads it out, expands the surface area by renewing the surface, and devolatilizes impurities by heating and evaporation. There is also an evaporator,
In this case, there is a problem that power is required and the cost is high.

Therefore, in order to eliminate the above-mentioned drawbacks and problems, a plate-fin type heat exchanger is provided in the main body that can reduce the pressure, and a pipe line through which the heat medium is supplied to and discharged from the heat exchanger, and a polymer A polymer supply pipe is provided separately, and the polymer is supplied from the pipe to a heat exchanger, heated, and further discharged into the main body from one of the heat exchangers. Device for removing volatile substances from inside (Japanese Patent Application Laid-Open No. 1986
-97302) has been proposed.

However, the above device is mainly intended for polymers, which are high viscosity substances, and when this device is adopted for low viscosity substances, the fluid of the low viscosity substances is not uniformly dispersed in the heat exchanger and is unevenly distributed. It flows. Therefore, there is a problem that heat exchange efficiency deteriorates.

[Problem to be solved by the invention]

The present invention has been made in order to solve the above-mentioned conventional problems, and it is a low viscosity fluid that can remove volatile impurities contained in a low viscosity fluid with high heat exchange efficiency and in a short processing time. The object of the present invention is to provide an apparatus for removing volatile substances from substances.

[Means to solve the problem]

As a means for solving the above problems, the volatile substance removal device of the present invention is provided with a plate fin type heat exchanger having a heat medium supply pipe and a discharge pipe in a drum body capable of reducing or pressurizing the drum body. is also supplied to the heat exchanger,
The fluid of the low viscosity substance heated by the heat medium is configured to form a liquid level and accumulate at the lower part of the drum body, and can be taken out from the discharge nozzle at the lower part, and in this case,
When a fluid containing a low viscosity substance flows from above to below the heat exchanger, it is recommended to install an appropriate fluid dispersion device such as a perforated plate or weir on the inlet side of the heat exchanger to uniformly distribute the low viscosity substance. This is a desirable configuration for dispersing and supplying the fluid to the heat exchanger, but if the above fluid is flowed from the bottom to the top of the heat exchanger, the low viscosity fluid can be supplied without a fluid distribution device. It is supplied to the heat exchanger in a uniformly dispersed state, resulting in good heat exchange efficiency.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

First, the apparatus of Example 1 shown in FIG. 1 is an apparatus for removing substances such as volatile impurities from a fluid F of low viscosity, and has a drum body that can be operated under either reduced pressure or increased pressure. 1 and a heat exchanger 3 integrally attached to the upper part of the heat exchanger 3.

A heat medium is supplied to the drum body 1 from a supply port 4 provided at the lower part, and is discharged from a discharge port 5 to heat the jacket wall surface of the drum body 1.

Next, this heat exchanger 3 includes a plate fin type heat exchanger, such as a plain type (flat plate fin), a louver type, a serrate type (flake fin), a perforate type (perforated fin), and a herlibone type (wave fin). Various types can be used, such as mold fins).

The heat exchanger 3 has a supply pipe 7 for supplying the heat medium H and a discharge pipe 8 for the heat medium H, and the heat medium 1 flows in the horizontal direction. The substance fluid F is uniformly dispersed from the inlet nozzle 10 through a fluid dispersion device 11 such as a perforated plate or a weir provided at the upper part of the inlet of the heat exchanger 3, and then flows through the vertical passage of the heat exchanger 3. Here, it is heated by the heat medium H and partially evaporates.

Next, as described above (the heated fluid F of a low viscosity substance is
The impurity volatile substance iB which remains in the air/liquid temperature phase and falls into the drum body 1, where the gas and liquid are separated and evaporated, is discharged from the discharge port 20 and treated as required.

On the other hand, the fluid F, which is a low-viscosity substance from which the volatile substance B has been separated by devolatilization, accumulates in the lower part of the drum body 1 and forms a liquid level W, which can be taken out from the discharge nozzle 19 provided at the lower part. It has become.

In the volatile substance removal device having the above configuration, the fluid F of a low viscosity substance supplied to the heat exchanger 3 and heated is continuously supplied into the drum body 1, and has a high heat transfer density. Since the plate-fin type heat exchanger 3 is used, heating and devolatilization of the fluid F, which is a low-viscosity substance, can be performed at the same time, and the residence time of the liquid is short, so the quality of the low-viscosity substance can be improved. be able to.

In addition, the devolatilized low-viscosity fluid F is transferred to the drum body 1.
Since the liquid forms a surface W at the lower part of the drum body 1 and accumulates, it is possible to prevent backflow from or to the outside from the discharge nozzle 19 in the drum body 1 which is under reduced or pressurized pressure.
It acts as a seal.

Next, the apparatus of Example 2 shown in FIG. 2 is an apparatus for removing volatile substances such as impurities from fluid F, which is a low viscosity substance, and has almost the same configuration and function as Example 1 shown in FIG. The fluid F, which is a low-viscosity substance containing impurities, is supplied from the inlet nozzle 10 at the bottom of the plate-fin type heat exchanger 3 provided at the bottom of the drum body 1, and is heated and evaporated by the heat medium H, thereby performing heat exchange. The fluid F rises in the vessel 3 as a gas/liquid mixed phase, but the outlet portion 13 of the fluid F of the heat exchanger 3 is provided to protrude into the drum body 1, and the gas/liquid mixture that is ejected into the drum body 1 rises.
The liquid mixed phase low viscosity substance collides with the collision plate 12, for example, shaped like an umbrella, provided in the drum body 1, and the volatile substance B in the gas phase, that is, impurities, etc., collides with the collision plate 12 and the drum body 1. It passes through the gap and is discharged from the discharge port 20 at the top.

On the other hand, the fluid F, which is a low-viscosity substance in the liquid phase, falls as it is, forms a liquid surface W in the lower part of the drum body 1, accumulates there, and is taken out from the discharge nozzle 19 in the lower part.

The channel on the heating side may be divided into a plurality of channels depending on the properties of the fluid F of the low-viscosity substance to be devolatilized, and each channel may be heated by a heating medium having a different temperature.

Further, the plate fin type heat exchanger 3 described above may be provided outside the drum body 1 so as to be integrated with the drum body 1, as in each of the above embodiments 1 and 2, or may be provided internally in the drum body 1. Alternatively, it may be provided outside or inside the side surface of the drum body 1, and is not restricted to that position.

〔Effect of the invention〕

According to the apparatus for removing volatile substances in low-viscosity substances of the present invention described above, a plate-fin type heat exchanger with high heat transfer density is used, so a compact apparatus for removing volatile substances from a low-viscosity substance can be obtained. In addition, heating and devolatilization of the fluid to be devolatilized can be performed simultaneously, and the liquid residence time is short, so that the quality of the fluid to be devolatilized can be improved.

Further, in the present invention, since the devolatilized fluid of the low viscosity substance forms a liquid level in the lower part of the drum body and accumulates therein, it serves as a seal for the drum body which is under reduced pressure or pressure.

In addition, when the heat exchanger in the present invention is provided at the upper part of the drum body so that the fluid of the low viscosity substance supplied to the heat exchanger is introduced in a uniformly dispersed state, the heat exchanger By providing a fluid dispersion device at the upper inlet of the drum body or by providing a heat exchanger at the bottom of the drum body, it is possible to provide a particularly effective function as a device for removing volatile substances in a low-viscosity substance.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views of an apparatus for removing volatile substances in low-viscosity substances according to the present invention. ■...Drum body, 3...Heat exchanger, 7...Supply pipe, 8...Discharge pipe, 19...Discharge nozzle, B...
Volatile substance, F...Fluid of low viscosity substance, H...Heating medium, W...Liquid level.

Claims (1)

[Claims] A plate-fin type heat exchanger having a heat medium supply pipe and a discharge pipe is provided on the drum body which can be depressurized or pressurized, and a low-viscosity fluid that is heated by being supplied to this heat exchanger is supplied to the drum body. A device for removing volatile substances from low-viscosity substances that forms a liquid level at the bottom of the main body and can be taken out from a discharge nozzle at the bottom.