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Method for recovering unreacted monomer in polymerization process of fluororubber and recovering system thereof

A recovery method and fluororubber technology are applied in the field of a method for recovering unreacted monomers during the polymerization of fluororubber and a recovery system thereof to achieve the effects of convenient operation, improved utilization rate of monomers, and reduced unit consumption.

Active Publication Date: 2013-01-02
ZHEJIANG FLUORINE CHEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For how to recycle the unreacted monomer in the fluororubber polymerization process, there is no report in the patent literature

Method used

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  • Method for recovering unreacted monomer in polymerization process of fluororubber and recovering system thereof
  • Method for recovering unreacted monomer in polymerization process of fluororubber and recovering system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] at 1m 3 The batch polymerization of binary fluororubber is carried out in the polymerization kettle. When the polymerization is finished, stop feeding. At this time, a total of 330kg is fed (including 150kg of hexafluoropropylene and 180kg of vinylidene fluoride). Stirring was stopped, and the temperature of the materials in the polymerization kettle was lowered. When the temperature of the materials in the polymerization tank decreased to 64°C, the pressure in the polymerization tank dropped from 2.0 MPa when the polymerization just stopped to 1.5 MPa. Open the gas phase monomer recovery valve on the polymerization kettle, put the recovered gas into the 0.5m 3 in the buffer tank. Control the pressure of the buffer tank. When the pressure of the buffer tank reaches 0.1-0.15MPa, turn on the gas diaphragm compressor to compress the recovered gas phase monomer into the 6m 3In the recovery monomer gas holder, the pressure of the recovery monomer gas holder is 0.23MPa at...

Embodiment 2

[0031] at 1m 3 The batch polymerization of binary fluororubber is carried out in the polymerization kettle. When the polymerization is finished, stop feeding. At this time, a total of 360kg is fed (including 120kg of hexafluoropropylene and 240kg of vinylidene fluoride). Stirring was stopped, and the temperature of the materials in the polymerization kettle was lowered. When the temperature of the materials in the polymerization tank decreased to 62°C, the pressure in the polymerization tank dropped from 2.0 MPa when the polymerization just stopped to 1.5 MPa. Open the gas phase monomer recovery valve on the polymerization kettle, put the recovered gas into the 0.5m 3 in the buffer tank. Control the pressure of the buffer tank. When the pressure of the buffer tank reaches 0.1-0.15MPa, turn on the gas diaphragm compressor to compress the recovered gas phase monomer into the 6m 3 In the recovery monomer gas holder, the pressure of the recovery monomer gas holder is 0.25MPa a...

Embodiment 3

[0033] at 0.35m 3 The continuous polymerization of binary fluororubber is carried out in the polymerization tank. When the polymerization proceeds to a cumulative feed of 115kg (including 52kg of hexafluoropropylene and 63kg of vinylidene fluoride), the pressure of the polymerization kettle is 2.0MPa, and the materials in the polymerization kettle are continuously put into 1m 3 In the emulsion storage tank, the aqueous solution of additives such as initiators is continuously added at the same time, and the mixed monomer of vinylidene fluoride and hexafluoropropylene (composed of 60wt% vinylidene fluoride and 40wt% hexafluoropropylene) is continuously added to maintain polymerization kettle pressure. When the pressure in the emulsion storage tank reaches 0.05-0.1MPa, open the gas phase monomer recovery valve on the emulsion storage tank, and put the recovered gas into 0.5m 3 in the buffer tank. Control the pressure of the buffer tank. When the pressure of the buffer tank rea...

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Abstract

The invention discloses a method for recovering unreacted monomer in polymerization process of fluororubber and a recovering system thereof, and belongs to the technical field of the fluoride chemical industry. The method comprises the following steps of: for batch polymerization, when a polymerizing kettle begins to relieve pressure after stopping reaction and cooling down, enabling gas phase materials in the polymerizing kettle to pass through a buffer slot, controlling pressure in the buffer slot to be lower than a specific value, starting an air diaphragm compressor, compressing the gas phase materials in the polymerizing kettle into a recovering monomer gas holder through the buffer slot and the air diaphragm compressor till the pressure in the polymerizing kettle reduces to be normal pressure, wherein the recovered gas phase comprises vinylidene fluoride and hexafluoropropylene. The recovering method and the recovering system thereof have simple process and convenient operation;by using the recovering method, the unreacted monomer in the polymerization process of fluororubber can be effectively recovered, the material consumption in the production of fluororubber can be reduced, the utilization ratio of monomer can be increased, the environment emission can be decreased, and the economic benefit and social benefit can be achieved. The recovering device has simple structure and safe and convenient use.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a method for recovering unreacted monomers in the polymerization process of fluorine rubber and a recovery system thereof. Background technique [0002] Fluorine rubber is widely used as an important sealing material in aerospace industry, automobile industry, chemical industry and other fields due to its excellent high temperature and chemical medium resistance. The polymerization process of fluororubber can be carried out in two ways: batch polymerization and continuous polymerization. [0003] The so-called batch polymerization, taking binary fluororubber as an example, is to pre-add deionized water, emulsifier, and buffer into the polymerization kettle that has been deoxygenated in advance, control the temperature in the reaction kettle to reach the specified temperature, and inject the vinylidene fluoride with the specified composition Add the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/02C08F214/22C08F214/28
Inventor 苗国祥王振兴李晓育陈炜
Owner ZHEJIANG FLUORINE CHEM NEW MATERIAL