System device for producing acetic acid from byproduct methyl acetate of production of polyvinyl alcohol and preparation method

Abstract

The invention discloses a system device for producing acetic acid from byproduct methyl acetate of production of polyvinyl alcohol and a preparation method, and belongs to the field of chemical industry. The device comprises a recovery tower I; a recovery tower II; a recovery tower III; a recovery tower IIII; a methanol and methyl ester mixing tank and an acetic acid reactor. Each device is connected with a pipeline and is fed. The preparation method is a new method for synthesizing the acetic acid, the byproduct methyl acetate of the production process of the polyvinyl alcohol is subjected tometal ion removing and purifying, is mixed with methanol in a certain ratio, and enters the acetic acid reactor to react with carbon monoxide by a carbonylation method to obtain the acetic acid. According to the method, the byproduct methyl acetate of the production process of the polyvinyl alcohol is directly subjected to metal ion removing and purifying, is mixed with the methanol in a certainratio, and enters the acetic acid reactor to react with the carbon monoxide to obtain the acetic acid, and the method can effectively control the metal ion content in the methyl acetate. The process of separating and refining the acetic acid and the methanol after the decomposition of the methyl acetate is reduced, the production cost and energy consumption of the polyvinyl alcohol product are greatly reduced, and the product market competitiveness is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a system device for producing acetic acid by utilizing polyvinyl alcohol by-product methyl acetate and a preparation method thereof. Background technique [0002] Methyl acetate, also known as methyl acetate, is a colorless, aromatic liquid that dissolves organic acids in esters. Volatile and flammable. Slightly soluble in water, miscible with ethanol, ether, etc. It is used as a solvent for cellulose nitrate, cellulose acetate, etc., as well as organic solvents required for the production of resins, coatings, inks, paints, adhesives, and leather, and polyurethane foam blowing agents. It is generally obtained by distillation after co-heating acetic acid and methanol in the presence of sulfuric acid. Acetic acid, also called acetic acid and glacial acetic acid, is an organic monobasic acid, an important oxygen-containing derivative of hydrocarbons, and is the source...

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Problems solved by technology

This makes the whole production process continue to heat and condense, reheat and condense. At the same time, n-butyl acetate is added as a water-carrying agent for the purification of acetic acid. These traditional separation processes are not only high in energy consumption, long in process, but also complicated in operation.

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