Technology for separating microscale sodium methylate from crude product of tetrahydrofuran production

Abstract

The invention belongs to the field of organic synthesis impurity removal and specifically relates to a technology for separating microscale sodium methylate from a crude product of tetrahydrofuran production. The invention aims to overcome defects of long route of present sodium methylate treatment process, high operational difficulty, high operational cost and large amount of solid wastes. The method of the invention comprises the following steps: after the alcoholysis process is completed during the polytetrahydrofuran perfluorosulfonic acid process, hydrogen ion in an ion exchange medium and sodion in sodium methylate undergo exchange by an ion exchange method; after treatment, sodium methylate is converted into methanol, sodion is adsorbed by the exchange medium to complete separation of sodium methylate; and the processed methanol undergoes evaporation to be thoroughly separated. By the above method, the alcoholysis catalyst processing flow can be greatly shortened during the polytetrahydrofuran perfluorosulfonic acid process, equipment investment is saved, discharge capacity of "three wastes (waste gas, waste water and industrial residue)" is reduced, and operational cost is saved.

Description

technical field [0001] The invention belongs to the field of recycling organic synthesis waste liquid, and in particular relates to a process for separating trace amounts of sodium methoxide from crude products produced by polytetrahydrofuran. Background technique [0002] The conversion of the intermediate polytetrahydrofuran diacetate (PTMEA) to the product in the synthesis of polytetrahydrofuran by using the perfluorosulfonic acid process requires an alcoholysis process, which requires the addition of a small amount of sodium methoxide as a catalyst to carry out alcoholysis in a methanol environment. The crude product after alcoholysis needs to separate catalyst sodium methylate to purify the product. At present, the known treatment technology is to add an aqueous solution of magnesium sulfate as an auxiliary agent to the crude product containing the catalyst. After the catalyst and the auxiliary agent undergo a neutralization reaction, the methanol contained therein is r...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the shortcomings of the existing sodium methoxide treatment process, such as long route, difficult operation, high operating cost and large amount of solid waste