Synthesis method of polyformaldehyde dimethyl ether

Abstract

The invention relates to a synthesis method of polyformaldehyde dimethyl ether, which mainly solves the problem that the traditional method for synthesizing the polyformaldehyde dimethyl ether with trioxymethylene as a raw material has higher cost. In the invention, methanol, methylal and paraformaldehyde are used as raw materials, wherein the mass ratio of the methanol to the methylal to the paraformaldehyde is (0-10): (0-10): 1, the using amount of the methanol and the methylal cannot be zero simultaneously; and the raw materials are in contact and react with a catalyst to generate the polyformaldehyde dimethyl ether with a chemical formula of CH3O(CH2O)nCH3 under the condition that the reaction temperature is 70-200 DEG C and the reaction pressure is 0.2-6MPa, wherein the used catalyst is selected from at least one of SO4<2-> / ZrO2, SO4<2-> / Fe2O3, Cl<-> / TiO2, Cl<-> / Fe2O3, SO4<2-> / Al2O3 and S2O8<2-> / ZrO2. The synthesis method provided by the method better solves the problem of the traditional method and can be used in industrial production of the polyformaldehyde dimethyl ether.

Description

technical field [0001] The invention relates to a method for synthesizing polyoxymethylene dimethyl ether, in particular to a method for synthesizing polyoxymethylene dimethyl ether with paraformaldehyde as a raw material. Background technique [0002] In recent years, with the deepening influence of the industrial revolution and my country's unique resource pattern of "more coal, less oil, and gas", my country's oil resources have become increasingly tense, and the pressure on oil supply has increased unprecedentedly. It is estimated that in the next 10 to 20 years, my country's oil supply rate will only be ~50%. How to use our country's rich coal resources to solve our country's energy crisis has become an urgent problem for scientific researchers. Therefore, the development of new oil substitutes from coal-based methanol has attracted increasing attention. [0003] DME was first proposed as a diesel additive. However, due to its poor cold start performance, high vapor p...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the process of synthesizing polyoxymethylene dimethyl ether with methanol and paraformaldehyde as raw materials in the prior art, there is a problem that the production cost is relatively high because of the high price of raw material paraformaldehyde, and a new method is provided. Synthetic method of polyoxymethylene dimethyl ether