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Catalyst for synthesizing propylene carbonate and its preparing method and use

A propylene carbonate and catalyst technology, which is applied to a catalyst for synthesizing propylene carbonate, a preparation method and an application field, can solve the problems of difficult recovery and reuse performance of the catalyst, insufficient catalytic activity, etc., and achieves good reuse performance, easy operation and reaction. mild conditions

Inactive Publication Date: 2006-05-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many literature reports on catalysts for this reaction, there are still problems such as insufficient catalytic activity, product separation and difficulty in catalyst recovery and reuse.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0017] Add 5.0g of chloropropyltrimethoxysilane to 33g of cyclohexane to prepare a solution, and after the ultrasonic wave (working frequency 40KHz) disperses evenly, add 3.3g of MCM-41 into it and seal it. The reaction system was ultrasonically oscillated for 1.3 hours. The sample was extracted with toluene for 9 hours and dried under vacuum at 95°C for 9 hours. That is Cl / MCM-41. Then add 1.5g of tetramethylammonium hydroxide into 30g of cyclohexane solution, disperse uniformly by ultrasonic wave, immerse the above 3.3g of Cl / MCM-41 into it, and seal it. The reaction system was ultrasonically oscillated for 0.7 hours, the sample was extracted with toluene for 9 hours, and vacuum-dried at 90° C. for 9 hours. That is, the reaction catalyst is obtained. Pass carbon dioxide into the reactor with built-in propylene oxide and catalyst to make CO 2 : Propylene oxide molar ratio is 1.6: 1, catalyst consumption is 0.5% of reactant gross weight, under stirring condition, be warmin...

Embodiment 3

[0019] Add 5.0g of chloropropyltrimethoxysilane to 37g of cyclohexane to prepare a solution, and after the ultrasonic wave (working frequency 28KHz) disperses evenly, add 3.7g of MCM-41 to it and seal it. The reaction system was ultrasonically oscillated for 1.7 hours. The sample was extracted with toluene for 11 hours and dried under vacuum at 85°C for 11 hours. That is Cl / MCM-41. Then 1.8g of tetramethylammonium hydroxide was added to 30g of cyclohexane solution, after the ultrasonic dispersion was uniform, the above 3.7g of Cl / MCM-41 was immersed in it and sealed. The reaction system was ultrasonically oscillated for 0.8 hours. The sample was extracted with toluene for 11 hours and dried under vacuum at 85°C for 11 hours. Get this reaction catalyst. Pass carbon dioxide into the reactor with built-in propylene oxide and catalyst to make CO 2 : Propylene oxide molar ratio is 1.8: 1, and catalyst consumption is 0.6% of reactant gross weight, under stirring condition, be w...

Embodiment 4

[0021] Add 5.0g of chloropropyltrimethoxysilane to 40g of cyclohexane to prepare a solution, and after the ultrasonic wave (working frequency 20KHz) disperses evenly, add 4.0g of MCM-41 into it and seal it. The reaction system was ultrasonically oscillated for 2 hours. The sample was extracted with toluene for 12 hours, and dried under vacuum at 80°C for 12 hours. That is Cl / MCM-41. Then add 2.0g of tetramethylammonium hydroxide into 30g of cyclohexane solution, after ultrasonic dispersion, immerse the above 4.0g of Cl / MCM-41 into it, and seal it. The reaction system was ultrasonically oscillated for 1 hour. The sample was extracted with toluene for 12 hours, and dried under vacuum at 80°C for 12 hours. Get this reaction catalyst. Pass carbon dioxide into the reactor with built-in propylene oxide and catalyst to make CO 2 : Propylene oxide molar ratio is 2.0: 1, catalyst consumption is 0.6% of reactant gross weight, under stirring condition, be warming up to 423K, react f...

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PUM

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Abstract

The present invention relates to a catalyst for synthesizing propylene carbonate. Said invention uses single active center organic quaternary ammonium hydroxide as active component, uses MCM-41 as carrier, uses chloropropyl trimethoxysilane as coupling agent and uses cyclohexane as solvent, and adopts ultrasonic technique to make the quaternary ammonium hydroxide be simply and moderately be grafted on the carrier MCM-41, its grafting quantity is 0.5-1.5 mmol / g, so as to obtain the invented catalyst.

Description

technical field [0001] The invention belongs to a catalyst for synthesizing propylene carbonate, a preparation method and application. Background technique [0002] Propylene carbonate (PC), abbreviated as propylene carbon, is a high-boiling and high-polarity solvent with excellent performance. It is widely used in organic synthesis, cosmetics, gas separation, battery dielectrics and metal extraction. In recent years, many domestic urea manufacturers have adopted propylene carbonate as a decarburization solvent, which has greatly increased the demand. PC synthesis methods mainly include phosgene method, transesterification method, chloropropanol method and propylene oxide (PO) and CO 2 Cycloaddition. Of which PO and CO 2 Cycloaddition of raw materials to PC is a low-pollution, environmentally friendly route. The catalysts that have been studied include non-metallic catalysts such as ammonium salts, amines, and phosphines, and metal compound catalysts such as nickel, zinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J32/00B01J37/00C07C68/04C07C69/96
CPCY02P20/141
Inventor 孙予罕魏伟张雪红
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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