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Method for continuous production of polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and paraformaldehyde, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as low mass transfer efficiency and low solubility, and achieve improved reaction efficiency, Improve depolymerization efficiency and strengthen the effect of speed-determining steps

Active Publication Date: 2022-01-07
TSINGHUA UNIV
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Problems solved by technology

CN104971667A discloses a fluidized bed device and method for preparing polyoxymethylene dimethyl ether by paraformaldehyde and methylal, but in this method, the solubility of paraformaldehyde solid in methylal is low, and the flow The solid-solid-liquid three-phase contact in the chemical bed reactor has low mass transfer efficiency

Method used

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  • Method for continuous production of polyoxymethylene dimethyl ether
  • Method for continuous production of polyoxymethylene dimethyl ether
  • Method for continuous production of polyoxymethylene dimethyl ether

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Embodiment 2

[0048] The processing device of embodiment 2 is as figure 2 As shown, paraformaldehyde decomposes in the fixed-bed pyrolysis reactor 201 with a pyrolysis temperature of 180° C. to produce formaldehyde gas, which is carried out of the pyrolysis reactor by nitrogen as a carrier gas.

[0049] The formaldehyde gas is passed into the packed tower absorption device 202, and is absorbed by the methylal liquid to obtain a methylal solution containing formaldehyde.

[0050] The methylal solution of formaldehyde and the acidic resin catalyst were respectively added into the fluidized bed reactor 203, the reaction temperature was 100° C., the operating pressure was 0.5 MPa, and the reaction time was 12 minutes.

[0051] The mixed liquid flowing out from the fluidized bed reactor 204 is divided into two streams, one stream refluxes into the packed tower 202, and the other stream enters the product separation device 204 for separation and purification to obtain DMM 3-5 .

Embodiment 3

[0053] The processing device of embodiment 3 is image 3 As shown, in the fixed bed pyrolysis reactor 301, the formaldehyde gas produced by the decomposition of paraformaldehyde is taken out of the pyrolysis reactor by nitrogen, and passed into the packed tower absorption devices 302 and 304 respectively.

[0054] In the packed tower absorption device 302, the formaldehyde gas is dissolved in the methylal liquid to obtain the methylal solution of formaldehyde, and then enters the fixed bed reactor 303, and reacts under the catalysis of an acidic resin catalyst, the reaction temperature is 80°C, and the operating pressure is 0.3MPa, reaction time 15min.

[0055] The mixed solution flowing out from the fixed bed reactor 302 has a low concentration of formaldehyde. After the formaldehyde gas is dissolved in the packed tower absorption device 304, it enters the fixed bed reactor 305 to continue the reaction. The reaction temperature is 80°C and the operating pressure is 0.3MPa.

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Abstract

The invention belongs to the technical field of energy and chemical industry, and particularly relates to a new process for continuous production of polymethoxydimethyl ether. The process of the invention uses paraformaldehyde and methylal as reaction raw materials and solid acid as catalyst. The process device includes a paraformaldehyde pyrolysis reactor, a gas-liquid absorption device for absorbing formaldehyde gas, and a reactor for reacting formaldehyde and methylal , Product separation device. The process of producing polymethoxydimethyl ether in the present invention comprises the following steps: the solid pyrolysis of paraformaldehyde generates formaldehyde gas, the formaldehyde gas is passed into a gas-liquid absorption device containing methylal in the liquid phase, and the methylal solution of formaldehyde is passed through the gas-liquid absorption device. Enter the reactor to react, and the liquid mixture obtained from the reaction enters the product separation device to obtain polymethoxydimethyl ether. Compared with the prior art, the reaction system of the present invention has low water content, fewer side reactions, higher reaction efficiency, and the process is significantly strengthened.

Description

technical field [0001] The invention generally relates to the technical field of energy and chemical engineering, and in particular to a new process for continuously producing polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ether (CH 3 O(CH 2 O) n CH 3 , DMM n ) is a general term for a class of linear polyether substances. There are only two chemical bonds of C-O and C-H in its molecular structure. It has the characteristics of high cetane number, high oxygen content, good volatility, no sulfur and aromatic hydrocarbons, etc. It is considered to be the most promising oxygenated fuel. Polyoxymethylene dimethyl ether is mainly produced from coal or biomass through the reaction of intermediate products such as methanol. Promoting its industrialization is in line with my country's energy characteristics of "rich in coal, poor in oil, and low in gas" and is conducive to optimizing the adjustment of energy structure. An important direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/56C07C43/303
CPCC07C41/56C07C43/303
Inventor 王铁峰魏然
Owner TSINGHUA UNIV
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