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A kind of method that can synthesize polyacrylonitrile with stainless steel reactor

A technology of polyacrylonitrile and reactor, which is applied in the field of polymer material synthesis, can solve the problems of not being fully and effectively utilized, accelerating the reaction rate, and affecting the performance of polymers, etc., and achieves the effect of fully and effectively utilizing and facilitating switching

Active Publication Date: 2022-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The polymerization kettle used in the production is an aluminum polymerization kettle instead of a stainless steel reactor. This is because AN itself is an acidic monomer, and ferrous ions are used as a catalyst in this reaction. If a stainless steel reactor is used, the iron ions in the polymerization kettle There will be different degrees of precipitation, which will lead to an accelerated reaction rate and affect the performance of the final polymer
As a result, production equipment is limited and not fully and effectively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 16.2Kg of deionized water and 9g of ethylenediaminetetraacetic acid (EDTA) into a polymerization vessel with a stirring device, blow nitrogen gas to a vacuum of -0.001MPa, adjust the pH value to 2-3, and add 1.8Kg of acrylonitrile Body, 18g sodium bisulfite, 0.13g ferrous ammonium sulfate, start to heat up, when the temperature of the polymerization system is at 30°C, start to add 3.6g potassium persulfate to control the amount of ferrous ammonium sulfate, potassium persulfate and sodium bisulfite The dropwise addition time was 20 minutes, and after the temperature was raised to 60°C for 60 minutes, 1.8 g of the reaction terminator EDTA was added, stirred for 10 minutes and discharged, and the polymer material was washed with water and dried at 50°C to obtain a PAN polymer.

Embodiment 2

[0031] Add 4.2Kg of deionized water and 10.8g of EDTA into the polymerization vessel with stirring device, blow nitrogen gas to vacuum degree -0.001MPa, adjust the pH value to 2-3, add 1.8Kg of acrylonitrile monomer, 18g of bisulfite Sodium, 0.13g ferrous ammonium sulfate, start to heat up, when the temperature of the polymerization system is at 30°C, start to add 3.6g potassium persulfate, control the dropping time of ferrous ammonium sulfate, potassium persulfate and sodium bisulfite at 40min, After heating up to 60°C and reacting for 60 minutes, add 1.8 g of reaction terminator EDTA, stir for 10 minutes and discharge, wash the polymer material with water, and dry at 50°C to obtain PAN polymer.

Embodiment 3

[0033] Add 10.8Kg of deionized water and 12.6g of EDTA into a polymerization vessel with a stirring device, blow nitrogen gas to a vacuum of -0.001MPa, adjust the pH value to 2-3, add 1.8Kg of acrylonitrile monomer, 18g of bisulfite Sodium, 0.13g ferrous ammonium sulfate, start to heat up, when the temperature of the polymerization system is at 30°C, start to add 3.6g potassium persulfate, control the dropping time of ferrous ammonium sulfate, potassium persulfate and sodium bisulfite at 30min, After heating up to 60°C and reacting for 60 minutes, add 1.8 g of reaction terminator EDTA, stir for 10 minutes and discharge, wash the polymer material with water, and dry at 60°C to obtain PAN polymer.

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Abstract

The invention discloses a method for synthesizing polyacrylonitrile with a stainless steel reaction kettle, belonging to the technical field of polymer material synthesis. The steps are as follows: add deionized water, acrylonitrile monomer, and ethylenediaminetetraacetic acid (EDTA) into a polymerization container with a stirring device, feed nitrogen gas, adjust the pH value to 2-3, heat up, and wait until the temperature of the polymerization system is at At 30°C-35°C, add the catalyst, oxidizing agent and reducing agent dropwise within 20min-40min, control the polymerization temperature at 45°C-60°C, after polymerization for 60min, add the reaction terminator EDTA to obtain the polymer material, and wash the polymer material with water , PAN polymer was obtained after drying at 50-80°C. The present invention adds a certain amount of metal chelating agent in the polymerization stage, and utilizes the chelating effect of iron ions and the metal chelating agent to effectively reduce the impact of iron ion precipitation in the stainless steel reactor on the polymerization reaction, so that the equipment can be fully and effectively utilized.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a method for synthesizing polyacrylonitrile with a stainless steel reactor. Background technique [0002] At present, most of the polyacrylonitrile (PAN) produced in the industry is produced by the aqueous phase precipitation polymerization system of acrylonitrile. The polymerization system mainly includes acrylonitrile (AN), comonomers, water-soluble initiators and water. The initiator system A water-soluble oxidation-reduction initiation system is mainly used, and ferrous ammonium sulfate is used as a catalyst. [0003] The polymerization kettle used in the production is an aluminum polymerization kettle instead of a stainless steel reactor. This is because AN itself is an acidic monomer, and ferrous ions are used as a catalyst in this reaction. If a stainless steel reactor is used, the iron ion in the polymerization kettle There will be different degrees of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/44C08F2/01C08F2/38C08F2/18C08F2/16
CPCC08F120/44C08F2/01C08F2/38C08F2/18C08F2/16
Inventor 车万里李留忠张勇郭卫东袁锦慧
Owner CHINA PETROLEUM & CHEM CORP
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