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Polymerization inhibitor of vinyl acetate solution and use method

A technology of polymerization inhibitor and vinyl acetate, which is applied in the field of polymerization inhibitor of vinyl acetate solution, which can solve the problems of waste, toxic and harmful gas, discharge of flammable and explosive substances, explosion of polymerization system, etc., and achieve the effect of cost saving

Inactive Publication Date: 2020-10-16
应急管理部化学品登记中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the safety relief device is a passive safety protection measure, and once activated, a runaway reaction is inevitable
Even if the safety relief device successfully protects the polymerization system, it will cause the polymerization system to detonate due to the complete runaway of the polymerization reaction, resulting in the generation of waste materials, toxic and harmful gases and the discharge of flammable and explosive substances. Consequences such as shutdown of the entire plant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of polymerization inhibitor of vinyl acetate solution, comprising comprising mass fraction is 7% 2,5-di-tert-butyl hydroquinone diphosphite, 7% sodium thiosulfate, 17% thiourea, 69% methyl alcohol ( The concentration is analytically pure, 99.9%, and the solvent temperature is 15±2°C).

[0019] When the temperature control of the vinyl acetate solution polymerization system fails, and the temperature still reaches 70°C after taking corresponding safety prevention and control measures, the emergency inhibitor is added, and the discharge valve is opened at the same time for discharge operation to reduce the liquid level in the polymerization system to the original The 60-80% of the inhibitor should be added to the polymerization system as much as possible.

[0020] The normal reaction temperature of the vinyl acetate polymerization reaction system is 65°C. When the temperature control of the reaction system fails and the system temperature rises to 73°C, the polymer...

Embodiment 2

[0022] According to the conditions described in Example 1, a polymerization inhibitor of vinyl acetate solution, comprising 7% 2,5-di-tert-butylhydroquinone bisphosphite, 7% sodium thiosulfate, 18% thiourea, 68% methanol (concentration is analytically pure, 99.9%).

[0023] When the temperature control of the vinyl acetate solution polymerization system fails, and the temperature still reaches 70°C after taking corresponding safety prevention and control measures, the emergency inhibitor is added, and the discharge valve is opened at the same time for discharge operation to reduce the liquid level in the polymerization system to the original The 60-80% of the inhibitor should be added to the polymerization system as much as possible.

[0024] After adding the polymerization inhibitor, the temperature of the reaction system dropped rapidly, and after 2.0 min, the temperature of the reaction system dropped below 60°C, and the addition of the polymerization inhibitor played an in...

Embodiment 3

[0026] According to the conditions described in Example 1, a polymerization inhibitor of vinyl acetate solution, comprising 7% 2,5-di-tert-butylhydroquinone bisphosphite, 7% sodium thiosulfate, 19% thiourea, 67% methanol (concentration is analytically pure, 99.9%).

[0027] When the temperature control of the vinyl acetate solution polymerization system fails, and the temperature still reaches 70°C after taking corresponding safety prevention and control measures, the emergency inhibitor is added, and the discharge valve is opened at the same time for discharge operation to reduce the liquid level in the polymerization system to the original The 60-80% of the inhibitor should be added to the polymerization system as much as possible.

[0028] After adding the polymerization inhibitor, the temperature of the reaction system dropped rapidly. After 1.8 minutes, the temperature of the reaction system dropped below 60°C, and the addition of the polymerization inhibitor played an in...

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PUM

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Abstract

The invention relates to a polymerization inhibitor of a vinyl acetate solution and a use method, and mainly solves the problem that implosion of vinyl acetate solution polymerization is out of control in the prior art. According to the technical scheme of the polymerization inhibitor and the use method, the polymerization inhibitor of the vinyl acetate solution comprises the following componentsby mass percentage: 5-10% of an antioxidant, 5-10% of a dispersing agent, 15-20% of a polymerization inhibitor and 60-70% of a solvent. The polymerization inhibitor well solves the problems, and can be used for polymerization inhibition of the vinyl acetate solution.

Description

technical field [0001] The invention relates to the technical field of researching emergency suppression of polyvinyl acetate explosion polymerization by vinyl acetate solution polymerization, in particular to a polymerization inhibitor of vinyl acetate solution and a use method. Background technique [0002] Polyvinyl acetate (PVAc), industrially known as polyvinyl acetate resin. It is a transparent glassy substance at room temperature and has strong adhesion. It is mainly used as coating, adhesive, paper, chewing gum base and fabric finishing agent. It can also be used as raw material for polyvinyl alcohol and polyvinyl acetal. very broad. And with the continuous advancement of science and technology, new application areas are still expanding. [0003] Polyvinyl acetate is obtained by free radical polymerization of vinyl acetate monomer in methanol solution. Since the solution polymerization of vinyl acetate is accompanied by an exothermic process, if the conditions are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/40C08F18/08
CPCC08F2/40C08F18/08
Inventor 金满平王婷张向倩张全郭云龙黄飞李运才
Owner 应急管理部化学品登记中心
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