A process and system for liquid-liquid mass transfer catalytic synthesis of tertiary carboxylic acid

Abstract

The invention relates to a process and system for synthesizing tertiary carboxylic acid by liquid-liquid mass transfer catalysis, comprising a synthesis unit, a catalyst regeneration unit, a reaction liquid treatment unit and a refining unit. Alkenes and acid-metal carbonyl salts are carboxylated in the synthesis unit by liquid-liquid mass transfer, and then enter the catalyst regeneration unit, gas-liquid mass transfer regenerates the metal carbonyl salt, and enter the synthesis unit for use after regeneration, independently control the volume ratio of tertiary carboxylic acid in the reaction solution> 20%, the reaction liquid is extracted from the regeneration unit, static layered and then extracted to obtain solvent-containing tertiary carboxylic acid, the amount of extractant is saved by about 2 / 3, and then the tertiary carboxylic acid product is obtained through washing, neutralization and refining. Part of the acid liquid is extracted from the stratifier as waste acid, and fresh catalyst is added to the synthesis unit, and the amount of waste acid is reduced by about 36%. It overcomes the problems of poor gas-liquid-liquid mass transfer effect, mutual influence between carboxylation reaction and carbonyl absorption reaction, olefin hinders CO coordination, high amount of waste acid, large amount of extraction agent, and high recovery energy consumption.

Description

technical field [0001] The invention belongs to the technical field of carboxylic acid preparation, and in particular relates to a process and system for synthesizing tertiary carboxylic acid by liquid-liquid mass transfer catalysis. Background technique [0002] Tertiary carboxylic acid and its derivatives are important carboxylic acid chemicals. There are three saturated carbon chains on the α-carbon connected to the carboxyl group. It has stable chemical properties, large steric hindrance, and its acidity, melting point and boiling point are lower than those primary and secondary carboxylic acids. Vinyl tertiary carboxylate is mainly used for the production of copolymer latex paint of vinyl tertiary carboxylate and vinyl acetate. Its environmental resistance and value are much higher than that of vinyl acetate latex paint, and it belongs to high-grade latex paint. Metal tertiary carboxylates such as cobalt, manganese, and lead are efficient drier for coatings and inks, a...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of technique of liquid-liquid mass transfer catalysis synthesis tertiary carboxylic acid, fundamentally change the mass transfer mode of gas-liquid-liquid, improve production efficiency, reduce side reaction and acid consumption (waste acid amount); Independently control the proportion of tertiary carboxylic acid in the reaction mixture to overcome the problem of large amount of extractant; solve the problem of a small amount of olefins polymerizing and reacting in the extraction stratifier when the tank reactor is back-mixed, reduce the generation of heavy olefins, and avoid such as Difficult-to-separate energy-intensive impurities such as octadecene

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