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Safety control method for out-of-control polymerization of vinyl acetate-acetic acid mixture containing acetaldehyde

A vinyl acetate and safety control technology is applied in the field of uncontrolled safety control of vinyl acetate-acetic acid mixed solution polymerization, and can solve problems such as uncontrolled polymerization of vinyl acetate storage tanks, violent polymerization, and major production safety liability accidents.

Active Publication Date: 2019-01-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

and most storage tanks cannot withstand these pressure environments
[0004] According to relevant reports in the prior art, on August 26, 2008, the crude vinyl acetate storage tank of Guangxi Vinylon Factory exploded, causing a major production safety liability accident
In addition, all major vinyl acetate manufacturers have experienced uncontrolled polymerization accidents in vinyl acetate storage tanks
Most pure vinyl acetate storage tanks generally do not add polymerization inhibitors due to the needs of the follow-up polymerization process, and their self-polymerization is much higher than that of crude vinyl acetate storage tanks. violent gathering, leading to fire and explosion accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Determination of safety control measures for vinyl acetate-acetic acid mixed solution with acetaldehyde content of 1% and vinyl acetate concentration of 30% in the storage tank: the mixed solution belongs to zone I in the storage process of the classification, and the pretreatment temperature should be TMR ad = The corresponding temperature at 64 hours, refer to the initial value of 40% vinyl acetate - acetic acid mixture, take the initial value of 50°C, lower it by 3.2°C, and take the final alarm temperature value of 46.8°C; after the operating temperature reaches the alarm temperature, cooling measures should be taken. The outer wall of the storage tank is sprayed with water, and a certain amount of polymerization inhibitor is injected to prevent the self-polymerization of vinyl acetate from further out of control.

Embodiment 2

[0027] Determination of safety control measures for the vinyl acetate-acetic acid mixture with acetaldehyde content of 1.5% and vinyl acetate concentration of 50% at the bottom of the rectification tower: the mixture belongs to zone II in the operation process of the classification, and the pretreatment temperature should be TMR ad = The corresponding temperature at 8 hours, refer to the initial value of 60% vinyl acetate-acetic acid mixture, which is 140°C, lower it by 5.4°C, and the final alarm temperature value is 134.6°C; after the operating temperature reaches the alarm temperature, the cooling load should be increased. And increase the amount of polymerization inhibitor added at different parts of the top, middle and bottom of the tower to prevent further out-of-control of vinyl acetate self-polymerization.

Embodiment 3

[0029] Determination of safety control measures for the vinyl acetate-acetic acid mixture with acetaldehyde content of 0.5% and vinyl acetate concentration of 98% at the top of the rectification tower: the mixture belongs to Zone IV in the operation process of the classification, and the pretreatment temperature should be TMR ad = The corresponding temperature at 8 hours, refer to the initial value of vinyl acetate monomer as 95°C, lower it by 4°C, and take the final alarm temperature value as 91°C; after the operating temperature reaches the alarm temperature, the cooling load should be increased, and a resistor should be added to the top of the tower Polymerization agent to prevent further out-of-control vinyl acetate self-polymerization reaction.

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PUM

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Abstract

The invention discloses an uncontrolled polymerization safe control method of vinyl acetate -acetic acid mixed liquid containing acetaldehyde. The uncontrolled polymerization safe control method comprises following steps: firstly, mixed solutions obtained in production processes are divided into four groups based on the vinyl acetate mass percentage concentration of the mixed solutions; thermodynamic data of the mixed solutions of each group is determined based on the corresponding vinyl acetate mass percentage concentration via thermodynamics analysis; a pretreatment temperature is determined based on the state of each of the mixed solutions, and the pretreatment temperature is adjusted based on vinyl acetate polymerization stability study and the acetaldehyde content of the mixed solutions. According to the uncontrolled polymerization safe control method, reasonable safety alarming temperature is set for the vinyl acetate -acetic acid mixed liquid at storage states and dynamic circulating states of a vinyl acetate device based on acetaldehyde content, and achievable safety protecting measures are proposed.

Description

technical field [0001] The invention relates to the technical field of production and storage of vinyl acetate, in particular to a safety control method for uncontrollable polymerization of acetaldehyde-containing vinyl acetate-acetic acid mixed liquid. Background technique [0002] Vinyl acetate is one of the 50 largest chemical raw materials in the world. Vinyl acetate is a synthetic polymer compound obtained by polymerization or copolymerization. Vinyl acetate has been used more and more in the fields of coatings, synthetic fibers, leather processing, and soil improvement through the production of a series of derivatives such as polyvinyl acetate, polyvinyl alcohol, and acetal resin. The wider the application. [0003] Vinyl acetate monomer (VA) is a readily polymerizable chemical intermediate and a building block for many polymer and emulsion applications. Laboratory data shows that under normal circumstances, the specification grade vinyl acetate monomer (VA) will not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F118/08C08F2/06
CPCC08F2/06C08F118/08
Inventor 姜杰赵磊文松孙冰徐伟
Owner CHINA PETROLEUM & CHEM CORP
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