Process device special for preparing polyoxymethylene dimethyl ethers through formaldehyde gas

Abstract

The invention discloses a special process device for preparing polyoxymethylene dimethyl ether from gaseous formaldehyde. The raw materials for synthesizing polyoxymethylene dimethyl ether are formaldehyde gas and methylal solution. The special process device includes sequentially connecting A fluidized bed reactor, an extraction and recovery unit and a refining unit, the fluidized bed reactor includes at least two layers of reaction sections from bottom to top, each layer of reaction section is filled with catalyst, and the bottom of each layer of reaction section is equipped with gas The distributor is directly connected to the reaction section, and each layer of the reaction section is also provided with a downcomer to connect the adjacent reaction sections, and the top of the downcomer is also provided with a wire mesh; the bottom of the fluidized bed reactor is provided with a There is an inlet for formaldehyde gas, and an inlet for methylal solution is set on the top of the fluidized bed reactor. The invention reduces the cost, improves the synthesis conversion rate and the yield is low, and the invention has a good heat transfer effect, can efficiently promote the reaction, and realizes controllability of the conversion degree.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology and equipment, and mainly relates to a process device for preparing polyoxymethylene dimethyl ether from special gas formaldehyde. Background technique [0002] The characteristics of my country's energy structure are: rich in coal, poor in oil, and low in gas. The sustained and rapid economic growth requires more and more energy, and the contradiction between social and economic development and oil supply has become increasingly prominent. Since 2009, my country's dependence on foreign crude oil has exceeded the warning line (50%) for six consecutive years, seriously affecting my country's energy strategic security. From the perspective of my country's energy strategy and security, combined with the characteristics of my country's primary energy structure, the development of coal-based liquid fuel synthesis technology is undoubtedly of strategic importance. In addition, my...

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Problems solved by technology

[0006] Purpose of the invention: In view of the above existing problems and defects, the present invention provides a special process device for preparing polyoxymethylene dimethyl ether from gaseous formaldehyde, which solves the high cost caused by the current production process of paraformaldehyde / trimerization , low synthetic conversion rate and low yield, and the present invention has a good heat transfer effect, can efficiently promote the reaction, and the degree of conversion is controllable

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