Continuous esterification production process of trimethyl borate

Abstract

The invention relates to a trimethyl borate continuous esterification production process, which comprises the following steps: proportioning methanol and boric acid, carrying out pre-reaction in a pre-reactor, feeding into an esterification tower after pre-reaction, and continuing to carry out autocatalytic reaction; heat coupling of esterification and rectification is completed in the esterification tower, crude trimethyl borate is extracted from the tower top of the esterification tower, and water is extracted from the tower bottom of the esterification tower; a crude trimethyl borate gas phase extracted from the tower top of the esterification tower enters a refining tower, a qualified trimethyl borate product is extracted from the tower top of the refining tower, qualified recovered methanol is obtained from the tower bottom of the refining tower, and the methanol returns to a reaction system for recycling. According to the invention, no catalyst is added, and reactants are adopted for autocatalysis to complete esterification reaction; the esterification reaction operation and the rectification operation are coupled to be completed in one esterification reaction tower, so that the reaction conversion rate and the reaction yield can be improved; the esterification reaction is an exothermic reaction, the esterification reaction and the rectification operation are completed in the esterification reaction tower at the same time, the esterification reaction heat can be applied to the rectification operation, and the energy consumption of the system is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of medicine and chemical industry, and in particular relates to a continuous esterification production process of trimethyl borate. Background technique [0002] Trimethyl borate is mainly used in the synthesis of organic borides and the preparation of high-purity boron, and can also be used as organic solvents, dehydrating agents, plasticizers, catalysts, welding fluxes and flame retardants, and can also be used as polymers stabilizer. At present, the preparation of advanced borates is mainly carried out by the transesterification method of lower borates and higher alcohols. With the development and application of domestic advanced borates and the rise of high-energy fuels, trimethyl borate as the representative The demand for lower borates will increase sharply, so it is of great significance to develop and research new methods for the preparation of trimethyl borate. [0003] The reaction of synthetic t...

AI Technical Summary

Problems solved by technology

It is not difficult to find that the primary conversion rate of the reaction raw materials in the above method is low; the operation is cumbersome; Blockage; the discharge of waste liquid pollutes the environment due to saturated boric acid

[0012] Moreover, the traditional reaction uses an acidic catalyst for the catalytic reaction, which requires high equipment material selection and high equipment cost

Acidic catalysts will cause side reactions between reactants, resulting in low reaction conversion and low reaction yield

The treatment of acidic catalysts requires additional consumption of other chemicals and the formation of new waste liquid, and there are problems such as long process routes, many unit operations, and a large number of equipment.

The traditional esterification reaction operation is completed in the pre-reactor, which belongs to the stewing pot reaction, the reaction conversion rate is low, the reaction heat cannot be comprehensively utilized, and the reaction energy consumption is high

Images