Continuous reaction rectifying synthesizing methylene diethyl ether technology

Abstract

A process for synthesizing diethoxymethane (DEM) by continuous reactive rectification includes such steps as continuously adding formaldehyde and acid catalyst to reactor, adding ethanol from reactifying column, respectively controlling the internal temp and the top temp of reactive rectifying tower to 80 deg.C and 65 deg.C, reactive reactifying to obtain distilate from tower, extracting by propanetriol or diethanolamine in liquid-liquid extracting tower to obtain DEM from tower top, and regenerating extractant, ethanol and water by regenerating tower for cyclic use. Its advantages are high speed and high output rate (more than 76%).

Description

technical field [0001] The invention relates to a process for synthesizing diethoxymethane through continuous reactive distillation. Background technique [0002] The traditional diethoxymethane (abbreviated as DEM) synthesis process adopts the following five methods: the dichloromethane method is the earliest method for synthesizing DEM, because the technology is backward and the yield is low, so this method has no industrialization; the dimethyl sulfoxide method , because dimethyl sulfoxide is unstable to acid, and heating will generate formaldehyde, so there is no industrialization; the calcium chloride method, the reaction yield can reach 86.5%, but due to the long reaction time, post-processing is inconvenient. So there is no industrialization; the acid catalyzed batch method has simple reaction operation and high yield (95%), but the reaction energy consumption is high and the production cycle is long; the chloramphenicol by-product method is the main way to produce DE...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the traditional process is that the reaction cycle is long and the yield is not ideal