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Implosion emergency disposal method for mixed liquor of vinyl acetate and acetic acid

A vinyl acetate, emergency disposal technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid esters, etc. role, etc.

Active Publication Date: 2016-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under controlled conditions, vinyl acetate monomer (VA) will polymerize to form vinyl acetate polymer, but when the free radical content is too high, runaway polymerization will occur
Runaway vinyl acetate polymerization is violent and produces pressure swings of up to 40 bar (580 psig) that most tanks cannot handle
[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
The polymerization inhibitors of vinyl acetate with polymerization inhibitors, such as hydroquinone, only work under specific conditions. Consumption is too fast, storage temperature is too high, etc., the polymerization inhibitor may lose or weaken the inhibition effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Determination of safety control measures for the vinyl acetate-acetic acid mixture with a concentration of 30% vinyl acetate in the storage tank: the mixture belongs to Zone I in the storage process of the classification, and the temperature for emergency treatment should be taken as TMR ad = The corresponding temperature at 24 hours, refer to the 40% vinyl acetate-acetic acid mixture to take a value of 62°C; after the operating temperature reaches the emergency treatment temperature, emergency measures should be taken to cut off the feed and add a large amount of polymerization inhibitor to the tank. And the material in the tank is discharged to the standby device urgently through the cooler to prevent the occurrence of vinyl acetate violent polymerization accidents.

Embodiment 2

[0028] Determination of safety control measures for the vinyl acetate-acetic acid mixture with a concentration of 50% vinyl acetate at the bottom of the rectification tower: the mixture belongs to Zone II in the storage process of the classification, and the temperature for emergency treatment should be TMR ad = The corresponding temperature at 6 hours, refer to the 60% vinyl acetate-acetic acid mixture to take the value of 155°C; after the operating temperature reaches the emergency treatment temperature, emergency measures should be taken to cut off the feed, inject methanol or acetic acid to cool down, and A large amount of polymerization inhibitors are added to the parts to prevent the occurrence of vinyl acetate violent polymerization accidents.

Embodiment 3

[0030] Determination of safety control measures for the vinyl acetate-acetic acid mixture with a 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 temperature for emergency treatment should be TMR ad = 6h, the corresponding temperature is 104°C with reference to vinyl acetate monomer; after the operating temperature reaches the emergency treatment temperature, emergency measures should be taken, such as cutting off the feed, injecting methanol or acetic acid to cool down, and adding a large amount of polymerization inhibitor to different parts agent to prevent the occurrence of vinyl acetate violent polymerization accidents.

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PUM

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Abstract

The invention discloses an implosion emergency disposal method for mixed liquor of vinyl acetate and acetic acid. The method comprises the steps that firstly, vinyl acetate in the mixed liquor is divided into four zones according to mass percentage concentration, then thermodynamics data in each zone is determined according to the divided zones in combination with thermodynamics analysis, and emergency disposal temperature is determined according to the state of the mixed liquor, that is, when the mixed liquor is in a storage state, the temperature corresponding to the time TMRad equal to 24 h needed by the mixed liquor reaching the maximum reaction rate under the adiabatic condition is determined as emergency disposal temperature; when the mixed liquor is in the running process, the temperature corresponding to the time TMRad equal to 6 h needed by the mixed liquor reaching the maximum reaction rate under the adiabatic condition is determined as the emergency disposal temperature; finally, a cooling measure is taken to prevent the reaction from being out of control according to the emergency disposal temperature. According to the method, the safety control measures of vinyl acetate with different concentrations are adjusted, and therefore safety production is achieved.

Description

technical field [0001] The invention relates to the technical field of production and storage of vinyl acetate, in particular to an emergency treatment method for sudden polymerization of a mixture of vinyl acetate and acetic acid. 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 form polymers, but ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/48C07C67/62C07C69/15
CPCC07C67/48C07C67/62C07C69/15
Inventor 姜杰张晨张铁石宁
Owner CHINA PETROLEUM & CHEM CORP