Device for recycling industrial grade diethoxymethane and method for recycling industrial grade diethoxymethane

Abstract

The invention discloses a device for recycling industrial grade diethoxymethane and a method for recycling the industrial grade diethoxymethane, the device comprises an extraction conversion tower anda side line regeneration tower connected with the extraction conversion tower, and the extraction conversion tower comprises a liquid-liquid extraction device and a catalytic conversion device whichare integrally arranged up and down. The method is as follows: the industrial grade diethoxymethane and an extractant are added into the liquid-liquid extraction device for reaction, and then a mixedsolution containing the extractant is sent to the side line regeneration tower for reaction; the mixed solution containing the extractant obtained at the bottom of the side line regeneration tower iscirculated to the liquid-liquid extraction device, an ethanol mixed solution obtained at the top of the tower is circulated to the catalytic conversion device, and a mixture of a formaldehyde solutionand a catalyst is added to the catalytic conversion device for catalytic conversion reaction. The significant advantage of the device is that the device can not only effectively recycle the industrial grade diethoxymethane, but also realize catalytic conversion of ethanol; the process is simple and the environment is protected.

Description

technical field [0001] The invention belongs to the field of preparation of diethoxymethane, and in particular relates to a device for recycling industrial-grade diethoxymethane and a method for recycling it. Background technique [0002] Diethoxymethane (abbreviation: DEM) has strong stability to alkalis and oxidants. It can be used not only as a solvent in organic synthesis, as a solvent in batteries, as a fuel additive, etc., but also as a reagent for organic reactions, such as formaldehyde. Equivalents, substrates for carbonylation, etc. [0003] At present, the methods for synthesizing DEM mainly include halogenated hydrocarbon method, polyphosphoric acid method, inorganic salt method, acid catalysis method and chloramphenicol by-product method, and the reaction generates about 46-58% DEM mixture. Since DEM forms azeotrope with ethanol and water, high reflux ratio (reflux ratio about 15-20:1) precision distillation method is used to extract DEM, the DEM content is only...

AI Technical Summary

Problems solved by technology

Since DEM forms azeotrope with ethanol and water, high reflux ratio (reflux ratio about 15-20:1) precision distillation method is used to extract DEM, the DEM content is only about 83-91%, and the process consumes a lot of energy

In order to obtain more than 99% DEM, there are currently two processing methods, one is to use sodium metal or alkali distillation to remove ethanol, and then obtain high-purity DEM through rectification; the other is to use multi-stage cross-flow extraction to extract Ethanol and water in the solution, and then use rectification to recover ethanol, but the first method wastes ethanol, and the by-products produced at the same time affect the environment, while the second method recovers ethanol, but the by-product ethanol has not been effectively used

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