Methyl propionate synthesis process device utilizing coupling hydrogenation type reactive distillation column

Abstract

The invention discloses a methyl propionate synthesis process device utilizing a coupling hydrogenation type reactive distillation column, which comprises a carbonylation reaction kettle, a flash tank, a reactive distillation column and a phase separation tank. And meanwhile, the coproduction of methyl propionate, alcohol, methyl butyrate, ethyl butyrate and other byproducts is realized only by taking low-cost methanol and CO as raw materials through a coupling hydrogenation unit and a phase-splitting and liquid-separating process, multi-stage heat exchange is carried out by adopting a high-temperature and high-pressure gas phase after flash evaporation, the heat energy is fully utilized, the energy consumption is reduced, and the production cost of the product is further reduced. Compared with a traditional method, the method for producing and synthesizing methyl propionate has the advantages that the conversion rate is increased to 99.5% by 95%, the equipment investment is reduced, the energy consumption is reduced by 60%, and meanwhile, the azeotropic product of organic acid ester and alcohol is synthesized only by taking methanol and CO which are easy to obtain and low in cost as raw materials.

Description

technical field [0001] The invention belongs to the technical field of chemical production, in particular to a production process device and method for methyl propionate. Background technique [0002] At present, the preparation process of methyl propionate is divided into two types: the process of synthesizing propionic acid and co-production of propionate, the process of directly catalyzing esterification to synthesize methyl propionate, or the direct purchase of propionic acid raw materials to synthesize methyl propionate. not tall. There are two processes for the synthesis of propionic acid, as follows: [0003] One is to use the ethylene hydroesterification process to produce propionate, and propionate can be hydrolyzed to obtain propionic acid; [0004] CH 2 = CH 2 + CO + CH 3 Oh → C 2 H 5 COOCH 3 [0005] The other is to synthesize propionic acid through the carbonylation reaction of methanol and ethanol, and then carry out the esterification react...

AI Technical Summary

Problems solved by technology

What adopted in this method is ethanol and CO as raw material, can't utilize the methanol with low price as raw material, the product containing methyl propionate that obtains after the propionate esterification simultaneously in this method is because also contains other acid, alcohol and can reduce subsequent aldol The yield of the condensation reaction, especially the thermal energy of the high-temperature and high-pressure gas after flash separation is not fully utilized, which will also lead to an increase in the cost of MMA products

Moreover, the presence of by-product water in the aldol condensation and esterification reaction is not conducive to the forward progress of the reaction. In this technology, the separation of by-product water is not explained, which may lead to a decrease in the purity of the product MMA and an increase in cost.

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