Co-production process method for synthesizing polyesters and alcohols such as methyl propionate from methanol and CO

Abstract

The invention discloses a co-production process method for synthesizing polyesters such as methyl propionate and alcohol from methanol and CO, which comprises the following steps: carrying out carbonylation reaction on reduced alcohol obtained by a system and raw material CO in a carbonylation reaction kettle to obtain a product containing acetic acid; the product containing acetic acid is subjected to flash evaporation separation and then is fed into a side plate reaction rectification tower, and the product and raw material methanol fed from the bottom are subjected to an esterification reaction in a side plate reaction rectification tower; a gas-phase light component product of the esterification reaction in the side plate reaction rectifying tower is subjected to a hydrogenation reaction to obtain reduced alcohol, the reduced alcohol is circularly sent back to the carbonylation reaction kettle to participate in the carbonylation reaction, and a target product containing methyl propionate and methanol is extracted from the side plate reaction rectifying tower. According to the invention, synthesis of methyl propionate and alcohol is realized only by using cheap methanol and CO as raw materials, and low-cost methyl propionate and alcohol as well as co-production of polyesters such as methyl butyrate and the like are obtained through an efficient heat energy recovery technology.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a production process device and method of methyl methacrylate MMA. 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 — 催化剂 → 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 ou...

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, no good solution is proposed for the separation of by-product water, which may lead to a decline in the purity of product MMA and cost increases

Images