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Device and method for devolatilizing polymer solution

A polymer solution and flange technology, which is applied in the field of polymer solution devolatilization devices, can solve the problems of not giving the polymer solution devolatilization efficiency and the temperature of the polymer solution, etc., to achieve high operating flexibility and reduce resistance consumption. , the effect of wide adaptability

Active Publication Date: 2022-08-02
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent does not give the devolatilization efficiency of the specific polymer solution, but if the amount of flash evaporation in the polymer devolatilization is large, the temperature of the polymer solution will be significantly reduced. Therefore, if it is necessary to remove the solvent in the low-concentration polymer solution When, as described in US3668161, US8153757B2, multistage heating is often required

Method used

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  • Device and method for devolatilizing polymer solution
  • Device and method for devolatilizing polymer solution
  • Device and method for devolatilizing polymer solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The devolatilization device of this embodiment is as follows figure 1 shown, where the baffle adopts figure 2 The circular baffle in c, the gas phase flows into the gas phase outlet of the flash tank through the wall gap between the baffle and the flash tank, the flow area is 1.5 times the cross-sectional area of ​​the gas phase outlet, and the slope of the gas phase outlet pipeline of the flash tank is 3゜ , the connection between the heater and the flash tank and the evaporation tank is flange connection. The heating medium in the heater is heat-conducting oil, the diameter of the heat exchange tube of the heater is Φ19×2mm, and the inner diameter is 15mm. Adoption of throttling facilities image 3 Strip holes are shown in a.

[0056] according to figure 1 As shown in the process, containing 15% wt ethylene-octene copolymer polymer solution, the solvent is cyclohexane, and it enters the preheater through the polymer solution feed line, preheats to 230 °C, and decom...

Embodiment 2

[0058] Using the same devolatilization device and process as in Example 1, the settings of the baffle, the heater and the gas phase pipeline of the flash tank remain unchanged, and the throttling facility adopts image 3 Rectangular hole shown in e.

[0059] The polymer solution containing 70wt% polysulfone, the solvent is chlorobenzene, enters the preheater through the polymer solution feed line, preheats to 220 ° C, and enters the flash tank for flash evaporation after decompression by the regulating valve, and the flash tank operation The temperature is 189.5 °C, the operating pressure is 1BarA, and the polymer solution with a polysulfone content of 90.7% is obtained at the bottom of the flash tank after flashing. After being heated to 194 °C by the heater at the bottom of the flash tank, it enters the evaporation tank. The operating temperature of the evaporation tank is 176.7 °C , the operating pressure is 5mBar, and the polymer melt with volatile content less than 500ppm...

Embodiment 3

[0061] The same devolatilization device and process are used as in Example 1, the only difference is the use of figure 2 The rectangular gas-phase baffle shown in b, the gas-phase flow area between the baffle and the wall of the flash tank is 1.2 times the cross-sectional area of ​​the gas-phase outlet.

[0062] A polymer solution containing 50 wt % styrene-acrylonitrile (SAN) polymer, the remainder of the solution consisting of 20 wt % ethylbenzene, 22.5 wt % styrene and 7.5 wt % acrylonitrile, via the polymer solution feed line Enter the preheater, preheat to 230°C, and then enter the flash tank for flash evaporation after decompression by the regulating valve. The operating temperature of the flash tank is 185.6°C, and the operating pressure is 2BarA. After flashing, the SAN content at the bottom of the flash tank is 77.9%. The polymer solution is heated to 190 ℃ by the heater at the bottom of the flash tank and then enters the evaporating tank. The operating temperature o...

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Abstract

The invention discloses a device and a method for devolatilizing a polymer solution. The device comprises a polymer solution feed line, a preheater, a first devolatilization unit, a heater, a second devolatilization unit, a polymer delivery pump, etc., wherein the polymer solution feed line is connected to the inlet of the preheater, The outlet of the preheater is connected to the first devolatilization unit, the liquid phase outlet at the bottom of the first devolatilization unit is connected to the heater, the outlet of the heater is connected to the inlet of the second devolatilization unit, and the bottom of the second devolatilization unit is connected to the polymer delivery pump. The polymer solution enters the preheater, and the heated polymer solution enters the first devolatilization unit to evaporate part of the volatiles; the polymer solution from which part of the volatiles are removed flows into the heater under the combined action of pressure difference and gravity, and after heating After reheating, the device enters the second devolatilization unit to remove the remaining volatiles in the polymer. The devolatilization device provided by the invention is ingeniously designed, and the use of pipelines and moving equipment is effectively reduced.

Description

technical field [0001] The present invention relates to a device and method for devolatilizing a polymer solution. Background technique [0002] The production of polymers often involves the removal of volatiles. First, monomers and solvents need to be recovered from the polymer solution for reuse; second, the polymer itself also needs to remove volatiles such as monomers, solvents, and by-products to meet polymer performance requirements; The volatile matter of the polymer is easy to volatilize and accumulate during the processing and storage of the polymer, and it is very likely to form an explosive atmosphere when exposed to the air, causing harm to personnel and the environment. [0003] Devolatilization of polymer solutions has its own particular difficulties. Although the relative volatility of the solvent and the polymer is very large, as the solvent is removed, the devolatilization stage goes from the flash devolatilization stage to the diffusion devolatilization s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/10C08F210/16C08G75/20C08F212/10C08F220/44
CPCC08F6/003C08G75/20C08L23/0815C08L25/12
Inventor 贾峥瑞乔小飞杨颖薛勇勇冯兴磊汪旭清李金明贾海兵宋明焱潘晓艺
Owner WANHUA CHEM GRP CO LTD
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