A kind of method for preparing diethoxymethane

Abstract

The invention discloses a method for preparing diethoxymethane, which comprises the following steps: adopting a rectification device and a tube bundle reaction device integrated up and down, mixing ethanol and formaldehyde according to a mass ratio of 1.15 to 1.25:1, and adding them to the tube bundle reaction device Inside, the reaction is carried out at 101-103°C to generate a mixture of diethoxymethane, and then the mixture is lifted to a rectification device for rectification to produce diethoxymethane. The remarkable advantage of the present invention is that the preparation method can make the produced diethoxymethane mixture continuously and timely exported to the bottom of the tube bundle reaction device without condensation, and directly enter the rectification device for rectification, so as to avoid the catalyst and reaction being always in a high temperature state. Coking inactivation avoids the occurrence of secondary reactions, effectively reduces the production of monoethoxymethane, improves the conversion rate of products and the selectivity of the reaction process, and is easy to operate.

Description

technical field [0001] The invention belongs to the field of diethoxymethane preparation. Background technique [0002] Diethoxymethane is regarded as a diether of the same carbon dihydric alcohol, which is quite stable to alkalis and oxidants, and has unique properties. It can not only be used as a solvent in organic synthesis, a solvent in batteries, and a fuel additive. It can also be used as a reagent for organic reactions, such as formaldehyde equivalents, substrates for carbonylation, etc. [0003] At present, the preparation of diethoxymethane uses inorganic acids, heteropoly acids or solid organic acids (such as: acidic molecular sieves, carbon-supported acids, etc.) as catalysts, and is prepared by kettle reaction or reactive distillation. The use of inorganic acid catalyzed reaction is easy to produce acidic wastewater, which is gradually eliminated by organic acid catalyzed reaction. Using organic acid as a catalyst, using kettle reaction to rectify diethoxymeth...

AI Technical Summary

Problems solved by technology

Using organic acid as a catalyst, using kettle reaction to rectify diethoxymethane, the process is simple, easy to operate, and the phenomenon is intuitive, but there are low conversion rate and poor selectivity in the preparation process, and easy to produce monoethoxymethane. The reaction process The product generated in the process cannot be removed in time, and secondary reactions are prone to occur, which brings difficulty to refining and affects product quality and yield.

Diethoxymethane is prepared by reactor reaction distillation using solid acid as a catalyst. There are problems such as uneven distribution of raw materials and catalyst, internal temperature difference and long contact time. The catalyst shows that it is easy to deposit carbon and affect the conversion rate.

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