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Preparation method of novel immobilized ionic liquid catalyst

A technology for ionic liquids and catalysts, which is applied in the field of preparation of new immobilized ionic liquid catalysts, can solve the problems of easy loss of active centers, high preparation costs, and low catalytic efficiency of ionic liquids, and achieve good catalytic effects, simple operation, and long life. long effect

Active Publication Date: 2013-03-27
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is aimed at the shortcomings of ionic liquid catalytic efficiency, high preparation cost and easy loss of active centers in the preparation process of the current immobilized ionic liquid catalyst. In order to solve the above problems, the present invention provides a catalytic A method for preparing an immobilized ionic liquid catalyst with high activity, good stability, low preparation cost, simple recovery after reaction and recyclable utilization

Method used

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  • Preparation method of novel immobilized ionic liquid catalyst
  • Preparation method of novel immobilized ionic liquid catalyst

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Experimental program
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Effect test

Embodiment 1

[0019] With the microporous molecular sieve MCM-22 as the carrier, the round bottom flask as the reactor, and toluene as the solvent, add toluene, MCM-22 and 2-ethyl-imidazole into the round bottom flask at normal temperature and pressure, in which toluene and The mass ratio of MCM-22 is 10:1, the mass ratio of MCM-22 and 2-ethyl-imidazole is 5:1, then the temperature is raised to 100°C, and ethyl bromide is added dropwise with a constant pressure dropping funnel, The molar ratio of bromoethane to 2-ethyl-imidazole is 1:1, and the reaction is continued for 6 hours after the drop is completed. After the reaction, the solid in the mixture was filtered to obtain the immobilized ionic liquid catalyst CAT1.

Embodiment 2

[0021] With the microporous molecular sieve MCM-22 as the carrier, the round bottom flask as the reactor, and toluene as the solvent, add toluene, MCM-22 and 2-butyl-imidazole into the round bottom flask at normal temperature and pressure, wherein toluene and The mass ratio of MCM-22 is 20:1, and the mass ratio of MCM-22 and 2-butyl-imidazole is 10:1, then the temperature is raised to 60°C, and chloropropane is added dropwise with a constant pressure dropping funnel, and the chlorine The molar ratio of propane to 2-butyl-imidazole is 1.2:1, and the reaction is continued for 8 hours after the drop is completed. After the reaction is finished, the solid in the mixture is filtered to obtain the immobilized ionic liquid catalyst CAT2.

Embodiment 3

[0023] With the microporous molecular sieve MCM-22 as the carrier, the round bottom flask as the reactor, and toluene as the solvent, add toluene, MCM-22 and 2-propyl-imidazole in the round bottom flask at normal temperature and pressure, wherein the toluene and The mass ratio of MCM-22 is 12:1, the mass ratio of MCM-22 and 2-propyl-imidazole is 5:1, then the temperature is raised to 70°C, and ethyl iodide is added dropwise with a constant pressure dropping funnel, The molar ratio of iodoethane to 2-propyl-imidazole is 1:1, and the reaction is continued for 7 hours after the drop is completed. After the reaction is finished, the solid in the mixture is filtered to obtain the immobilized ionic liquid catalyst CAT3.

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Abstract

The invention relates to a preparation method of a novel immobilized ionic liquid catalyst, wherein the method comprises the following steps of: under the normal pressure, taking microporous molecular sieve MCM-22 as a carrier, methylbenzene as a solvent and 2-alkyl imidazole and halogenated alkane as raw materials; and at a certain reacting temperature and by a certain reacting duration, directly synthesizing a comparatively large ionic liquid catalyst in the supercage of the microporous molecular sieve MCM-22, so immobilization of the ionic liquid catalyst is achieved. The catalyst prepared by the preparation method disclosed by the invention is excellent in immobilization effect and the method is simple in operation; after the reaction, the catalyst, which can be recovered and recycled just by simple treatment, is long in service life, free from any pollution and quite low in reacting cost; the preparation method is an effective method for immobilization of the ionic liquid catalyst, and successfully overcomes the shortcomings of the conventional methods. The catalyst, which is applied to synthesis of cyclic carbonate, is comparatively high in catalytic activity, and yield of the cyclic carbonate can reach 82.31% and selectivity is 90.22%.

Description

technical field [0001] The invention relates to the field of preparation of an ionic liquid catalyst, in particular to a preparation method of a novel immobilized ionic liquid catalyst for synthesizing cyclic carbonates. Background technique [0002] In recent years, ionic liquids have become a research hotspot in many research fields because of their unique advantages: (1) low vapor pressure, non-volatile, non-flammable; (2) wide liquid temperature range, good conductivity and wide Potential window; (3) Strong dissolving ability; (4) Low toxicity, recyclable; (5) Adjustable acidity and alkalinity, etc. Therefore, it has been widely researched and applied in the fields of organic synthesis, catalytic application and organic solvents. Although ionic liquids show advantages such as high activity and high selectivity in the synthesis of cyclic carbonates, there are still certain difficulties in catalyst recovery and recycling. [0003] Therefore, how to realize the recovery a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07D317/36C07D317/38
Inventor 李永昕薛冰许杰
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES