Catalytic synthesis method for polyoxymethylene dimethyl ethers (PODE) by molecular sieves

A technology of polyoxymethylene dimethyl ether and synthesis method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high price and high production cost, and achieve low production cost, good yield and high The effect of reaction conversion

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the process of synthesizing polyoxymethylene dimethyl ether with methanol and paraformaldehyde as raw materials in the prior a...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 2 grams of catalyst ZSM-5 (Si / Al=49), 100 milliliters of methanol and 100 grams of paraformaldehyde into a 300 milliliter tank reactor, react for 4 hours at 130 ° C and 0.5 MPa autogenous pressure, and extract samples for centrifugation Then analyzed by gas chromatography. The product contains polyoxymethylene dimethyl ether and unreacted raw material methanol and paraformaldehyde, and its composition distribution is shown in Table 1.

Embodiment 2

[0015] Add 2 grams of catalyst MCM-56 (Si / Al=2.5), 100 milliliters of methanol and 50 grams of paraformaldehyde into a 300 milliliter tank reactor, react for 4 hours at 130 ° C and 0.6 MPa autogenous pressure, and extract samples for centrifugation Then analyzed by gas chromatography. The product contains polyoxymethylene dimethyl ether and unreacted raw material methanol and paraformaldehyde, and its composition distribution is shown in Table 1.

Embodiment 3

[0017] Add 2 grams of catalyst HY (Si / Al=3.3) in a 300 milliliter tank reactor, 100 milliliters of methanol and 100 grams of paraformaldehyde, react for 4 hours at 130 ° C and 0.8 MPa autogenous pressure, and extract the sample by centrifugal separation Gas chromatography analysis. The product contains polyoxymethylene dimethyl ether and unreacted raw material methanol and paraformaldehyde, and its composition distribution is shown in Table 1.

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Abstract

The invention relates to a catalytic synthesis method for polyoxymethylene dimethyl ethers (PODE) by molecular sieves, mainly solving the problem of relatively high cost in the conventional method which adopts trioxymethylene as a raw material. In the method, methanol, methylal and paraformaldehyde are adopted as raw materials based on the mass ratio of (0-10): (0-10):1, the raw materials contactwith a catalyst to react and generate PODE, wherein the dosages of the methanol and the methylal can not be zero at the same time; the reaction temperature is 70-200 DEG C; the reaction pressure is 0.1-6MPa; and the adopted catalyst is selected from at least one of beta zeolite, X zeolite, Y zeolite, ZSM-5 molecular sieve, MCM-22, MCM-56, UZM-8 or SAPO-34 molecular sieve. The technical scheme adopted by the invention solves the above problem preferably, thus being applicable to industrialized production of the PODE.

Description

technical field [0001] The invention relates to a method for synthesizing polyoxymethylene dimethyl ether by molecular sieve catalysis. 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 performance, high vapor pressure at room temperature, and easy air resistance, the cost of DME as an alternative...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56
Inventor 李丰冯伟樑高焕新孙洪敏杨为民
Owner CHINA PETROLEUM & CHEM CORP
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