High-purity methyl acetate production process device and method

Abstract

The invention discloses a high-purity methyl acetate production process device and method. The high-purity methyl acetate production process device comprises a reactive distillation column and a plurality of external reactors, wherein the reactive distillation column is dividend into a methyl alcohol separation section, a multilayer reaction section, an extraction section and a rectifying section from bottom to top. The multilayer reaction section is of a multilayer tower plate structure. The reaction section of each layer of tower plate is circularly connected with the corresponding external reactor through a pipeline. The extraction section is communicated with the multilayer reaction section and is provided with an acetic acid inlet. The top of the rectifying section is further connected with a condenser and a return tank. The separation section is provided with a methyl alcohol inlet, and the bottom of the separation section is circularly connected with a reboiler. Reaction and separation are organically combined, so that a reaction rate is increased, reverse reaction is suppressed, and a conversion rate is effectively improved. Therefore, the mass concentration of methyl acetate products is improved, and the device can be used for producing high-purity (97% or more) methyl acetate products and has the advantages of simplicity, high efficiency, remarkable economic benefits and the like.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical engineering, and in particular relates to a production device and a process method of methyl acetate. Background technique [0002] Methyl acetate is an important solvent and organic chemical raw material, used to replace acetone, butanone, ethyl acetate, cyclopentane, etc. It is mainly used as a quick-drying solvent for nitrocellulose and cellulose acetate. Paint coatings, raw materials for artificial leather and spices, as well as oil extraction agents; at the same time, high-purity methyl acetate can be used to synthesize acetic acid, acetic anhydride, methyl acrylate, vinyl acetate and acetamide. With the development of C1 chemical industry, the demand for methyl acetate as an industrial raw material has further increased. The concentration of methyl acetate sold in the market is mostly 90% to 95% (mass fraction, the same below), and the market price of high-purity methyl acetate ...

AI Technical Summary

Problems solved by technology

[0003] (l) The synthesis of methyl acetate is a reversible reaction, limited by chemical equilibrium, and the reaction conversion rate is low

[0004] (2) Methyl acetate and water, methyl acetate and methanol, methyl acetate, methanol, and water form an azeotrope that is close to the boiling point of methyl acetate respectively, which is difficult to separate, and the product refining system is very complicated

[0005] (3) A large amount of unreacted methanol and acetic acid need to be recycled in the system, the separation process is complicated, the equipment investment is large, and the energy consumption is high

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