Method and device for preparing sodium methoxide by coupling steam permeation and alkaline process

Abstract

The invention provides a method and a device for preparing sodium methoxide by coupling steam permeation and alkaline process. The method is characterized in that the produced methanol-water mixture in the alkaline type sodium methoxide production process is separated by a steam permeation membrane separation device and a technique, and the separated high-purity methanol is directly used for the production of the sodium methoxide. The device and the method have the advantages that the steam permeation membrane separation is used for the steam recycling of sodium methoxide, so that the traditional rectification methanol recycling tower is replaced; compared with the prior art, the anhydrous methanol can be completely recycled and reutilized, so as to ensure the stable and continuous runningof the reaction process; the operation elasticity is improved, the energy consumption is decreased, and the running cost, land occupation area and investment cost are reduced; the operation of the whole set of device is simple and convenient, and the running is stable.

Description

technical field [0001] The invention relates to the field of energy-saving and consumption-reducing production of sodium methoxide, in particular to a method for preparing sodium methoxide by separating and recovering anhydrous methanol through a vapor permeation membrane. Background technique [0002] Sodium methoxide is a strong basic organic salt. It can be used as a condensation agent and catalyst to produce organic esters such as methyl formate and dimethyl carbonate. It can also be used as an intermediate for vitamins and pyridines. It has a wide range of applications. ,Market prospects. In recent years, sodium methoxide has also been used to catalyze the synthesis of biodiesel, which has attracted widespread attention. [0003] Sodium metal method and alkali method are two main methods for mass production of sodium methoxide in industry. The sodium methoxide prepared by the metal sodium method has low content of free alkali and few impurities, but due to the generat...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of low methanol recovery rate, high energy consumption and high equipment investment cost in the existing sodium methoxide production process, and to provide a sodium methoxide coupled with a high-efficiency and low-cost methanol recovery and recycling technology module Preparation method and device

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