Method for synthesizing polymethoxy dimethyl ether under catalysis of geminal dicationic ionic liquid

A polymethoxydimethyl ether, ionic liquid technology, applied in chemical instruments and methods, preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve the problem that the selectivity of chemical reactions is difficult to control, frequent regeneration, shortening catalyst Life and other issues, to achieve the effect of easy operation, mild reaction conditions and low corrosiveness

Inactive Publication Date: 2011-02-02
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the uneven acidity of heterogeneous catalysts, the selectivity of the chemical reactions catalyzed by them is often difficult to control.
At the same time, since the organic matter is easy to form coke on the surface of the solid catalyst, it is inevitable that the catalyst must be frequently regenerated in the catalytic reaction, which greatly shortens the life of the catalyst.

Method used

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  • Method for synthesizing polymethoxy dimethyl ether under catalysis of geminal dicationic ionic liquid
  • Method for synthesizing polymethoxy dimethyl ether under catalysis of geminal dicationic ionic liquid
  • Method for synthesizing polymethoxy dimethyl ether under catalysis of geminal dicationic ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a 100mL reactor, add 0.202g of catalyst 1, 3.982g of methanol, and 5.572g of paraformaldehyde in sequence. Inflate nitrogen to a pressure of 2.7 MPa, heat to 353K and stir for 4 hours. According to gas chromatography analysis, the conversion rate of paraformaldehyde is 85.4%. The relative content is methylal (m=1), 50.1%; m=2, 32.3%; m =3-8, 17.6%; m>8, not detected.

Embodiment 2

[0032] As in Example 1, 0.156g of catalyst 2, 6.441g of methanol, and 10.213g of paraformaldehyde were added in sequence. Inflate with nitrogen to a pressure of 3.0MPa, heat to 423K and stir for 1 hour. According to gas chromatography analysis, the conversion rate of paraformaldehyde is 57.5%. The relative content is methylal (m=1), 30.9%; m=2, 26.6%; m=3~8, 41.4%; m>8, 1.1%.

Embodiment 3

[0034] As in Example 1, 0.091 g of catalyst 3, 3.474 g of methanol, and 7.237 g of paraformaldehyde were added in sequence. Inflate with nitrogen to a pressure of 2.2 MPa, heat to 393K and stir for 6 hours. According to gas chromatography analysis, the conversion rate of paraformaldehyde is 91.2%. The relative content is methylal (m=1), 24.9%; m=2, 41.9%; m=3~8, 33.2%; m>8, not detected.

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Abstract

The invention discloses a method for synthesizing polymethoxy dimethyl ether under the atalysis of geminal dicationic ionic liquid. In the method, methanol and trioxymethylene are taken as reaction raw materials and the geminal dicationic ionic liquid is adopted as a catalyst to catalytically synthesize the polymethoxy dimethyl ether under the reaction temperature of 333 to 423K and the reaction pressure of 0.5 to 4MPa. The method has the highest reaction conversion rate of 91.5 percent, high product selectivity, and the active diesel added-component DMM308 content of 49.6 percent.

Description

technical field [0001] The invention relates to a method for synthesizing polyoxymethylene dimethyl ether by catalyzing the reaction of methanol and trioxane by a dumbbell-shaped ionic liquid. Background technique [0002] Due to its high thermal efficiency and low fuel consumption, diesel engines have attracted attention in recent years, and dieselization of internal combustion engines has become a trend. With the continuous increase of oil consumption and the enhancement of people's environmental awareness, the requirements for fuel consumption and smoke level of internal combustion engines are becoming more and more stringent. The use efficiency of diesel oil, the realization of fuel saving and the reduction of harmful gas emissions have become urgent problems to be solved. A relatively simple, economical and effective method is to add additives to the fuel. The cetane number of diesel is an important index to measure the performance of diesel. Increasing the cetane nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C08G2/10C07C41/56B01J31/02C08G2/06
Inventor 陈静唐中华夏春谷宋河远李臻
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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