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Preparation method of polyoxymethylene dimethyl ethers

A technology of dimethyl ether and polyoxymethylene, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve problems such as catalyst corrosion, and achieve good technical effects, catalyst activity and target product selectivity improvement. Effect

Active Publication Date: 2014-04-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] CN101182367A and CN101962318A disclose the method for preparing polyoxymethylene dimethyl ether by using acidic ionic liquid as a catalyst and using methanol and paraformaldehyde as raw materials, but there is also the problem of serious corrosion of the catalyst
[0008] CN101665414A discloses a method for preparing polyoxymethylene dimethyl ether by using acidic ionic liquid as a catalyst and using methylal and paraformaldehyde as raw materials, but there is also the problem of serious corrosion of the catalyst
[0009] In summary, the catalysts used in the prior art have the disadvantage of being corrosive

Method used

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  • Preparation method of polyoxymethylene dimethyl ethers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The performance evaluation of the catalyst was carried out on a 300ml autoclave reaction device. Add 2 grams of catalyst, 100 grams of methanol, and 100 grams of paraformaldehyde in the autoclave, and react for 2 hours at 130 ° C and a pressure of 6 MPa by filling nitrogen, filter and separate the catalyst and the reaction product, and analyze the obtained mixture by gas chromatography The composition is shown in Table 1. The catalyst is Al-MCM-41, its SiO 2 / Al 2 o 3 The molar ratio was 50.

[0019]

Embodiment 2

[0021] According to the steps of [Example 1], except that the catalyst uses a different catalyst, add 1.5 grams of catalyst, 100 grams of methanol, and 150 grams of paraformaldehyde, and react for 2 hours at 120 ° C and under a pressure of 6 MPa by filling nitrogen gas. The specific test The conditions and reaction results are shown in Table 1.

[0022]

Embodiment 3

[0024] According to the steps of [Example 1], except that the catalyst uses a different catalyst, add 2 grams of catalyst, 80 grams of methanol, and 200 grams of paraformaldehyde, and react for 5 hours at 130 ° C and under a pressure of 4 MPa by filling nitrogen. The specific test The conditions and reaction results are shown in Table 1.

[0025]

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Abstract

The invention relates to a preparation method of polyoxymethylene dimethyl ethers, mainly solving a problem that catalysts are corrosive in the prior art. According to the technical scheme adopted by the preparation method, methanol or dimethyl ether, and formaldehyde or trioxymethylene are adopted as raw materials, the molar ratio of the methanol or the dimethyl ether to the formaldehyde or the trioxymethylene is 1:(0.1-10), the raw materials are contacted with a catalyst and reacted at 50-200 DEG C under 0.1-10 MPa to produce the polyoxymethylene dimethyl ethers, and the catalyst is at least one selected from Al-MCM-41, Al-MCM-48, Al-SBA-15, Al-HMS, Al-MSU-1 or Al-MSU-2. By the scheme, the problem is solved well and the preparation method can be used in industrial production of the polyoxymethylene dimethyl ethers.

Description

technical field [0001] The invention relates to a preparation method of polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ether (Chinese name can also be polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether, polyoxymethylene dimethyl ether Ether, polyoxymethylene dimethyl ether, etc.), that is, polyoxymethylene dimethyl ethers (PODE), which is a general term for a class of substances, and its molecular structure is CH 3 O(CH 2 O) n CH 3 , with higher cetane number (cetane number, CN. When n=3~8, CN>76) and oxygen content (42~49%). When the value of n is 3 to 8, its physical and chemical properties and combustion performance are very close to those of diesel, and it can be used as a diesel additive. The amount added to diese...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56C08G2/10C08G2/08C08G2/06
CPCC07C41/56C07C43/30
Inventor 何欣袁志庆滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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