Preparation method of polymethoxyl dimethyl ether by using lewis acid as catalyst

A polymethoxydimethyl ether and Lewis acid technology, which is applied in chemical instruments and methods, preparation of organic compounds, chemical recovery, etc., can solve the problem of high cost of ionic liquid catalysts, and achieve low follow-up processing costs and simple follow-up processing. , The effect of reducing equipment maintenance costs

CN106495996AInactive Publication Date: 2017-03-15CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-03-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a preparation method of polymethoxyl dimethyl ether by using lewis acid as catalyst. The preparation method of polymethoxyl dimethyl ether by using lewis acid as catalyst comprises steps of taking lewis acid as catalyst, trioxymethylene and dimethoxymethane as reaction raw materials, performing catalytic reaction and preparing polymethoxyl dimethyl ether. The invention further provides the polymethoxyl dimethyl ether prepared by the preparation method of polymethoxyl dimethyl ether by using lewis acid as catalyst. In the preparation method of polymethoxyl dimethyl ether by using lewis acid as catalyst, the catalyst can reduce the synthesis cost of the polymethoxyl dimethyl ether, improve the product distribution, promote product quality, remove corrosion, reduce the equipment maintenance cost, and keep environmental friendly; besides, the reutilization effect of the catalyst is excellent and obviously better than the other catalyst.
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Description

technical field

[0001] The invention relates to a method for preparing polyoxymethylene dimethyl ether by using Lewis acid as a catalyst, and belongs to the technical field of catalysts. Background technique

[0002] The diesel engine has a large compression ratio, high thermal efficiency, and good fuel economy performance, so it is widely used. However, in the process of diesel combustion, due to the need to improve the combustion efficiency, the combustion performance is poor, and the smoke and NO in the exhaust gas x High content, serious environmental pollution. Due to today's increasingly stringent environmental regulations, this problem needs to be solved urgently. In principle, hardware transformation of diesel engines can improve diesel combustion efficiency, but due to the large number of diesel engines, it is difficult to implement in practice. A feasible strategy is to increase the cetane number of diesel oil, thereby greatly improving its combustion performanc...

Examples

Embodiment 1

[0029] The present embodiment provides a kind of method that takes Lewis acid as catalyst to prepare polyoxymethylene dimethyl ether, and this method comprises the steps:

[0030] In a 250mL autoclave, add 0.075g Lewis acid catalyst MgCl 2 , 10.07g dimethoxymethane, 5.95g paraformaldehyde. Pressurize to 0.4MPa with nitrogen, heat to 130°C, start stirring, react for 5 hours, lower the temperature, take out the product, recover the catalyst, and obtain the reaction product, which is a mixture containing polyoxymethylene dimethyl ether and raw materials.

[0031] The obtained reaction product is determined:

[0032] The reaction product is weighed, sampled and analyzed by gas chromatography. The analysis results show that the conversion rate of paraformaldehyde is 93.89%, the conversion rate of dimethoxymethane is 46.76%, and the PODE 3-8 Selectivity is 56.28%, PODE 3-4 The selectivity is 41.11%.

[0033] This embodiment also provides polyoxymethylene dimethyl ether prepared by...

Embodiment 2

[0035] The present embodiment provides a kind of method that takes Lewis acid as catalyst to prepare polyoxymethylene dimethyl ether, and this method comprises the steps:

[0036] In a 250mL autoclave, add 0.42g Lewis acid catalyst Fe 2 (SO 4 ) 3 , 13.27g dimethoxymethane, 9.87g paraformaldehyde. Pressurize to 0.4MPa with nitrogen, adjust the temperature to 130°C, start stirring, react for 5 hours, lower the temperature, take out the product, recover the catalyst, and obtain the reaction product, which is a mixture containing polyoxymethylene dimethyl ether and raw materials .

[0037] The obtained reaction product is determined:

[0038] The reaction product is weighed, sampled and analyzed by gas chromatography. The analysis results show that the conversion rate of paraformaldehyde is 92.19%, the conversion rate of dimethoxymethane is 43.23%, and the PODE 3-8 Selectivity is 53.41%, PODE 3-4 The selectivity is 43.85%.

[0039] This embodiment also provides polyoxymethy...

Embodiment 3

[0041] The present embodiment provides a kind of method that takes Lewis acid as catalyst to prepare polyoxymethylene dimethyl ether, and this method comprises the steps:

[0042] In a 250mL autoclave, add 1.74g Lewis acid catalyst MgSO 4 , 15.21g dimethoxymethane, 17.52g paraformaldehyde. Pressurize to 0.4MPa with nitrogen, adjust the temperature to 130°C, start stirring, react for 5 hours, lower the temperature, take out the product, recover the catalyst, and obtain the reaction product, which is a mixture containing polyoxymethylene dimethyl ether and raw materials .

[0043] The obtained reaction product is determined:

[0044] The reaction product is weighed, sampled and analyzed by gas chromatography. The analysis results show that the conversion rate of paraformaldehyde is 91.87%, the conversion rate of dimethoxymethane is 45.66%, and the PODE 3-8 Selectivity is 54.91%, PODE 3-4 The selectivity is 41.76%.

[0045] This embodiment also provides polyoxymethylene dime...