Preparation process of formaldehyde alcoholic solution for polymethoxy dimethyl ether production

Abstract

Aiming at the problem that the acquisition of formaldehyde with low water content decides the feasibility of DMMn synthesis and directly influences the product synthesis conversion rate, aldehyde canbe concentrated to 85 percent through a vacuum concentration system, the water content in the formaldehyde is dewatered to 0.5 to 3 percent in a dewatering tower, methyl alcohol with a low boiling point is condensed with the formaldehyde, the polymerization degree controllability of the formaldehyde in a liquid phase is realized, and a formaldehyde alcoholic solution with a polymerization degree nbeing equal to 3 to 10 is obtained, so that the most suitable reaction raw material-the formaldehyde alcoholic solution with a low water content is found for polymethoxy dimethyl ether synthesis. Theformaldehyde vacuum concentration system is combined with a stripping tower principle, so that the formaldehyde alcoholic solution with the low water content is prepared, the water content in the reaction system is reduced, the product decomposition is avoided, the DMMn synthesis conversation rate is efficiently improved, meanwhile, the risk of polymerization during a high-concentration formaldehyde concentration process is avoided due to the introduction of the formaldehyde, the concentration temperature is reduced, the generation of formic acid is reduced, and an advantageous effect is achieved on separating a follow-up polymethoxy dimethyl ether product.

Description

technical field [0001] The invention relates to a process for producing polymethoxydimethyl ether, in particular to a process for preparing a formaldehyde alcohol solution for producing polymethoxydimethyl ether. Background technique [0002] Global energy has entered a period of serious exploitation. There is less and less high-quality energy, and energy prices are increasing. After the special crude oil crisis, countries have gradually started to reduce production and increase crude oil prices. Oil prices will gradually rise in the future. The characteristics of my country's energy structure are: rich in coal, poor in oil, and little in gas, the continuous and rapid economic growth has increased the demand for energy, and the contradiction between social and economic development and oil supply has become increasingly prominent. The development of coal liquefaction to oil technology is undoubtedly of strategic importance. In addition, my country's methanol production ca...

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to overcome the problems of high cost, low synthetic conversion rate and low yield in the process of producing polyoxymethylene dimethyl ether with paraformaldehyde / trimerization, and adopt the 85% formaldehyde aqueous solution method In the production process, the conversion rate is not high, and the risk of high-concentration formaldehyde polymerization is high. A preparation process for formaldehyde alcohol solution for polyoxymethylene dimethyl ether production is provided.

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