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Method for producing polyoxymethylene dimethyl ether from paraformaldehyde

A technology of paraformaldehyde and dimethyl ether, which is 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, and achieve low production cost, The effect of improving productivity and uniform distribution

Active Publication Date: 2018-02-13
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 producing polyoxymethylene dimethyl ether with methanol, methylal and paraformaldehyde as reaction raw materials in the prior art. A new method of producing polyoxymethylene dimethyl ether from paraformaldehyde and a new catalyst suitable for the process

Method used

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  • Method for producing polyoxymethylene dimethyl ether from paraformaldehyde
  • Method for producing polyoxymethylene dimethyl ether from 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- / HCPs (the molar ratio of covalent group to ligand is 0.1), wherein the mass fraction ratio of solid superacid to HCPs carrier is 20:80, 100 grams of methanol and 100 grams of paraformaldehyde, autogenous at 130 ° C and 0.8 MPa React under pressure for 4 hours, 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- / SAM-HCPs (the molar ratio of covalent group to ligand is 0.1), wherein the mass fraction ratio of solid superacid to SAM-HCPs 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- / P(DVB-VBC) (the molar ratio of covalent group to ligand is 0.1), wherein the mass fraction ratio of solid superacid to P(DVB-VBC) carrier is 20:80, 100 grams of methylal and 100 gram of paraformaldehyde, reacted at 130°C and 0.6MPa autogenous pressure for 4 hours, extracted the sample and analyzed it by gas chromatography after centrifugal separation. 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 producing polyoxymethylene dimethyl ether by using paraformaldehyde, which mainly solves the problems of low catalyst reaction efficiency and high cost of trioxymethylene as a raw material in the past. The present invention uses methanol, methylal and paraformaldehyde as raw materials, wherein the mass ratio of methanol: methylal: paraformaldehyde is (0-10): (0-10): 1, wherein methanol and methylal are The dosage cannot be 0 at the same time, under the condition that the reaction temperature is 70~200 ℃, and the reaction pressure is 0.2~6MPa, the raw material is contacted with the catalyst, and the reaction generates polyoxymethylene dimethyl ether, and the catalyst dosage is 0.05~10% of the weight of the raw material, wherein The used catalyst includes the following components in weight fraction: a) 30-80 parts of ultra-high cross-linked polymer carrier (HCPs); b) 20-70 parts of solid super acid technical scheme, which can solve the problem well , which can be used in the industrial production of polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a method for producing polyoxymethylene dimethyl ether with paraformaldehyde, in particular to a method for producing 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 performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/30C07C41/56
Inventor 杨为民高晓晨高焕新石竹王灿周健陈剑
Owner CHINA PETROLEUM & CHEM CORP
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