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Method for preparing polyoxymethylene dimethyl ether

A polyoxymethylene dimethyl ether and trioxymethylene technology, which is applied in the preparation of organic compounds, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of complex separation process between catalysts and reaction products, and achieve high reaction conversion rate and product. Yield, simple process, simple effect of reaction separation

Active Publication Date: 2010-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that there is a problem in the prior art that there is a complex separation process between the catalyst and the reaction product, and a new method for preparing polyoxymethylene dimethyl ether is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 2 grams of catalyst ZSM-5, 100 milliliters of methanol and 100 grams of paraformaldehyde into a 300 milliliter tank reactor, fill with nitrogen to a pressure of 6 MPa, heat to 130 ° C and stir for 4 hours, filter and separate the catalyst and the reaction product, and pass through the gas phase Chromatographic analysis, the product contains methylal and polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is as follows (expressed in weight %): methyl alcohol 14.3%, paraformaldehyde 4.2%, methylal 36.7%, n= 213.4%, n=312.7, n=44.6%, n=5~1014.1, n>10, the balance.

Embodiment 2

[0019] Add 2 grams of catalyst MCM-56, 80 milliliters of methanol and 160 grams of paraformaldehyde into a 300 milliliter tank reactor, fill with nitrogen to a pressure of 4 MPa, heat to 130 ° C and stir for 4 hours, filter and separate the catalyst and the reaction product, and pass through the gas phase Chromatographic analysis, the product contains methylal and polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is as follows (expressed in weight %): methyl alcohol 21.4%, paraformaldehyde 10.2%, methylal 30.2%, n= 29.4%, n=310.7, n=43.6%, n=5~1012.1, n>10, the balance.

Embodiment 3

[0021] Add 2 grams of catalyst beta zeolite, 120 milliliters of methanol and 70 grams of paraformaldehyde into a 300 milliliter tank reactor, fill with nitrogen to a pressure of 6 MPa, heat to 130 ° C and stir for 4 hours, filter and separate the catalyst and the reaction product, and go through gas chromatography Analysis, the product contains methylal and polyoxymethylene dimethyl ether and unreacted raw materials, and its composition distribution is as follows (expressed in weight %): methyl alcohol 13.5%, paraformaldehyde 9.1%, methylal 39.2%, n=212.2 %, n=314.7, n=44.9%, n=5~106.4, n>10, balance.

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PUM

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Abstract

The invention relates to a method for preparing polyoxymethylene dimethyl ether. The invention mainly solves the problems of the prior art that: catalyst is corrosive, and is complexly separated from reactant, and energy consumption is high. The method adopts methanol and trioxymethylene as materials, the materials react with catalyst by way of contact under mild conditions, so that the polyoxymethylene dimethyl ether is produced, wherein the catalyst is selected from Beta zeolite, ZSM-5 molecular sieve, MCM-22 and MCM-56 zeolite molecular sieve. The method effectively solves the problems, and can be used in the industrial production of polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a preparation method of polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ethers (PODE), is a general term for a class of substances, and its simplified formula can be expressed as CH 3 O(CH 2 O) n CH 3 , when the value of n is 2-10, it can be used as a diesel additive, and the addition amount in diesel can reach 30% (v / v). PODE has higher oxygen content (ranging from 42 to 51%) and cetane number (above 30), which can improve the combustion status of diesel in the engine, increase thermal efficiency, and reduce solid pollutants, COx and NOx emissions. It is reported that adding 5-30% CH 3 OCH 2 OCH 3 It can reduce NOx emission by 7-10%, and reduce PM by 5-35%. Adding PODE can not only replace part of diesel, but also improve the combustion efficiency of diesel. Therefore, it is considered to be a diesel additive with great application prospects. ...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56B01J29/06
Inventor 冯伟樑李丰高焕新杨为民
Owner CHINA PETROLEUM & CHEM CORP
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