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

A vinyl acetate, emergency disposal technology, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve problems such as runaway polymerization of vinyl acetate storage tanks, major production safety liability accidents, fire explosions, etc.

Active Publication Date: 2018-09-04
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, an explosion occurred in the crude vinyl acetate storage tank of Guangxi Vinylon Factory, 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 emergency treatment 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 emergency treatment temperature should be taken as TMR ad = The corresponding temperature at 24 hours, refer to the initial value of 40% vinyl acetate-acetic acid mixture, which is 62°C, lowered by 3.2°C, and the final emergency treatment temperature is 58.8°C; after the operating temperature reaches the emergency treatment temperature, emergency measures should be taken , cut off the feed, add a large amount of polymerization inhibitor to the storage tank, and discharge the material in the tank to the standby device through the cooler to prevent the occurrence of violent vinyl acetate polymerization accidents.

Embodiment 2

[0027] Determination of emergency treatment 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 storage process of the classification, and the emergency treatment temperature should be taken as TMR ad = The corresponding temperature at 6 hours, refer to 60% vinyl acetate-acetic acid mixture, the initial value is 155°C, lowered by 5.4°C, and the final emergency treatment temperature is 149.6°C; after the operating temperature reaches the emergency treatment temperature, emergency measures should be taken , cut off the feed, inject methanol or acetic acid to cool down, and add a large amount of polymerization inhibitors in different parts to prevent the occurrence of vinyl acetate violent polymerization accidents.

Embodiment 3

[0029] Determination of emergency treatment measures for the vinyl acetate-acetic acid mixture with acetaldehyde content of 6% and vinyl acetate concentration of 98% at the top of the rectification tower: the mixture belongs to zone IV in the storage process of the classification, and the emergency treatment temperature should be taken as TMR ad = The corresponding temperature at 6h, refer to the initial value of vinyl acetate monomer as 104°C, lower it by 19.2°C, and take the final emergency treatment temperature as 84.8°C; after the operating temperature reaches the emergency treatment temperature, emergency measures should be taken to cut off the feed and inject Cool down the temperature with methanol or acetic acid, and add a large amount of polymerization inhibitors to different parts to prevent the occurrence of violent polymerization accidents of vinyl acetate.

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PUM

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Abstract

The invention discloses an emergency disposal method for uncontrolled polymerization of acetaldehyde-containing vinyl acetate-acetic acid mixed liquor. According to the method, in the production period, vinyl acetate in mixed liquor is divided into four zones; then according to the zones, thermodynamic data of each zone is analyzed and determined under the assistance of thermodynamic analysis; the emergency processing temperature is determined according to the state of the mixed liquor; and according to the research on polymerization stability of vinyl acetate and the acetaldehyde content of the mixed liquor, the emergency processing temperature is adjusted so as to determine the final emergency processing temperature. The provided method can set a reasonable and safe emergency processing temperature for vinyl acetate-acetic acid mixed liquor, which is in a storage state and dynamic operation process in each production period in a vinyl acetate device, according to the acetaldehyde content, and provides practical and feasible safety measures.

Description

technical field [0001] The invention relates to the technical field of vinyl acetate production and storage, in particular to an emergency treatment method for out-of-control polymerization of vinyl acetate-acetic acid mixed liquid containing acetaldehyde. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/62C07C69/15
CPCC07C67/62C07C69/15
Inventor 姜杰文松赵磊孙冰石宁
Owner CHINA PETROLEUM & CHEM CORP
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