Process for synthesis of polyoxymethylene dimethyl ether from methyl

Abstract

The invention relates to a process for the synthesis of polyoxymethylene dimethyl ether from methyl, solves the problems of low cost and high yield in the synthesis of polyoxymethylene dimethyl ether. The process for the synthesis of polyoxymethylene dimethyl ether from methyl is divided into a reaction zone and a separation zone; the reaction zones includes a methanol storage tank, a preheater, a fixed bed reactor and a bubbling reactor; the process is the reaction zone is as below: methanol by is preheated, vaporized, mixed with air and sent into the fixed bed reactor, the methanol is subjected to catalytic oxidation under the action of a formaldehyde synthesis catalyst to generate formaldehyde; the formaldehyde enters into the bubbling reactor and reacts with methanol and a recycled mixture under the catalysis of a solid acid catalyst to form polyoxymethylene dimethyl ether. The separation zone includes an anion exchange resin bed, a rectification module and a product storage tank; and the process steps in separation zone are as below: the material discharged from the bubbling reactor passes through the anion exchange resin to remove acid and enters into the distillation separation module, trimer and tetramer of polyoxymethylene dimethyl ether enter into the product storage tank, and other components are recycled to the reactor. The technical scheme can be used in polyoxymethylene dimethyl ether production.

Description

technical field [0001] The invention relates to a process for synthesizing polyoxymethylene dimethyl ether from methanol. Background technique [0002] In recent years, low-carbon has become a major social theme and has gained increasing attention. For example, how to reduce the highly polluting exhaust emissions brought about by the booming automobile manufacturing industry and how to improve the efficiency of fuel oil use has become a research topic of many institutions. [0003] It is generally accepted that oxygenates are very suitable as diesel blending components. At present, many companies and research institutes are investing in finding and screening suitable oxygen-containing compounds, and the screening objects include: acetals, alcohols, carbonates, lipids, ethers, glycol derivatives, etc. For diesel, oxygenated compounds need to have high cetane number, low self-ignition point, and fast ignition. In addition, it should have good miscibility with ordinary diese...

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is the problem of high product cost and low yield of polyoxymethylene dimethyl ether synthesis process, and a new process for synthesizing polyoxymethylene dimethyl ether is provided, which has the characteristics of low product cost and high yield

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