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Method for synthesizing polyoxymethylene dimethyl ether through paraformaldehyde

A paraformaldehyde and dimethyl ether technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high cost of paraformaldehyde and low catalyst reaction efficiency

Active Publication Date: 2016-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of low catalyst reaction efficiency and high cost of paraformaldehyde as raw material in the process of synthesizing polyoxymethylene dimethyl ether with methanol, methylal and paraformaldehyde as raw materials in the prior art. A new method for synthesizing polyoxymethylene dimethyl ether from paraformaldehyde and a new catalyst suitable for the process

Method used

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  • Method for synthesizing polyoxymethylene dimethyl ether through paraformaldehyde
  • Method for synthesizing polyoxymethylene dimethyl ether through paraformaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Add 2 g of catalyst SO to a 300 ml tank reactor 4 2- / PIM-1 (the molar ratio of covalent group to ligand is 0.1), wherein the mass fraction ratio of solid superacid to PIM-1 carrier is 20:80, 100 grams of methanol and 100 grams of paraformaldehyde, at 130 ° C React with 0.8MPa autogenous pressure for 4h, extract the sample and analyze it by gas chromatography after centrifugation. The product contains polyoxymethylene dimethyl ether and unreacted raw material methanol and paraformaldehyde, and its composition distribution is shown in Table 1.

Embodiment 2

[0019] Add 2 g of catalyst SO to a 300 ml tank reactor 4 2- / PIM-2 (the molar ratio of covalent group to ligand is 0.1), wherein the mass fraction ratio of solid superacid to PIM-2 carrier is 20:80, 100 grams of methanol and 100 grams of paraformaldehyde, at 130 ° C React with 0.6MPa autogenous pressure for 4h, extract the sample and analyze it by gas chromatography after centrifugation. The product contains polyoxymethylene dimethyl ether and unreacted raw material methanol and paraformaldehyde, and its composition distribution is shown in Table 1.

Embodiment 3

[0021] Add 2 g of catalyst SO to a 300 ml tank reactor 4 2- / PIM-6 (the molar ratio of covalent group and ligand is 0.1), wherein the mass fraction ratio of solid superacid and PIM-6 carrier is 20:80, 100 grams of methylal and 100 grams of paraformaldehyde, in React at 130°C and 0.6MPa autogenous pressure for 4 hours, extract the sample and analyze it by gas chromatography after centrifugation. The product contains polyoxymethylene dimethyl ether and unreacted raw materials methylal and paraformaldehyde, and its composition distribution is shown in Table 1.

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Abstract

The invention relates to a method for synthesizing polyoxymethylene dimethyl ether through paraformaldehyde. The method mainly solves the problems that catalysts in the past are low in reaction efficiency, and cost is high as trioxymethylene serves as a raw material. According to the method, methyl alcohol, methylal and paraformaldehyde are used as raw materials, the mass ratio of methyl alcohol to methylal to paraformaldehyde is (0-10):(0-10):1, the amount of adopted methyl alcohol and the amount of adopted methylal can not be zero at the same time, the reaction time is 70 DEG C-200 DEG C, reaction pressure is 0.2-6 MPa, the raw materials make contact with a catalyst to react to generate polyoxymethylene dimethyl ether, the amount of the adopted catalyst is 0.05-10% of the weight of the raw materials, and the adopted catalyst is prepared from, by weight, 30-80 parts of inherent microporous polymer carrier (PIMs) and 20-70 parts of solid super acid. The problems are solved well, and the catalyst can be applied to industrial production of polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a method for synthesizing polyoxymethylene dimethyl ether from paraformaldehyde, in particular to a method for synthesizing polyoxymethylene dimethyl ether from 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 per...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56
Inventor 杨为民高晓晨高焕新石竹刘志成杨贺勤贾银娟
Owner CHINA PETROLEUM & CHEM CORP
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