Process for the preparation of ethylene carbonate from ethylene oxide and carbon dioxide

A technology of ethylene carbonate and ethylene oxide, which is applied in the field of preparing ethylene carbonate from ethylene oxide and carbon dioxide, can solve the problems of low catalyst activity and easy loss of active components, and achieve the effect of high activity

Active Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of low catalyst activity and easy loss of active

Method used

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  • Process for the preparation of ethylene carbonate from ethylene oxide and carbon dioxide
  • Process for the preparation of ethylene carbonate from ethylene oxide and carbon dioxide
  • Process for the preparation of ethylene carbonate from ethylene oxide and carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 18.0 ml of 25% by weight concentrated ammonia water was added to a mixed solution of 80.0 ml of deionized water and 890.0 ml of ethanol (the molar ratio of ammonia to ethanol was 0.016, and the molar ratio of deionized water to ethanol was 0.29). In the presence of 40W ultrasonic waves, 41.6 grams of ethyl orthosilicate (TEOS, the molar ratio of TEOS to ethanol is 0.013) is added dropwise to the mixed solution. After dripping, continue to use the same power ultrasonic treatment for 3 hours and centrifuge to separate the precipitate. After washing with deionized water, the obtained SiO 2 The nanospheres were re-dispersed in 200ml deionized water by ultrasound, and then 200ml containing polyethyleneimine (PEI, average molecular weight 1600) 3.3g and KCl 5.1g aqueous solution (PEI and SiO 2 The weight ratio of nano-microspheres is 0.29, KCl and SiO 2 The weight ratio of nano-microspheres is 0.45). Stir at 60°C for 4 hours and then centrifuge, wash the obtained solid with et...

Embodiment 2

[0019] 285.0 ml of 25% by weight concentrated ammonia water was added to a mixed solution of 349.1 ml of deionized water and 81.0 ml of methanol (the molar ratio of ammonia to methanol was 1.9, and the molar ratio of deionized water to methanol was 9.7). In the presence of 400W ultrasonic waves, 30.4 grams of methyl orthosilicate (TMOS, the molar ratio of TMOS to methanol is 0.1) is added dropwise to the mixed solution. After dripping, continue to use the same power ultrasonic treatment for 3 hours, then centrifuge to separate the precipitate, wash with deionized water, and remove the obtained SiO 2 The nanospheres were re-dispersed in 200 ml of deionized water by ultrasound, and then 200 ml of an aqueous solution containing 0.13 g of polyethyleneimine (PEI, average molecular weight 16000) and 0.25 g of KCl (PEI and SiO 2 The weight ratio of nano-microspheres is 0.011, KCl and SiO 2 The weight ratio of nano-microspheres is 0.020). Stir at 30°C for 0.5 hours and then centrifuge, ...

Embodiment 3～6

[0023] Change the amount of concentrated ammonia water used, the average molecular weight of the PEI used is 6600, and the rest of the operation steps are the same as [Example 1], the obtained core-shell catalyst has a core phase / shell phase weight ratio, PEI and ZnCl 2 The weight ratio is consistent with [Example 1], the core phase SiO 2 The average diameter of the microspheres, the thickness of the shell phase and the catalytic activity under the same conditions are listed in Table 1.

[0024] Table 1

[0025]

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Abstract

The invention relates to a method for preparing ethylene carbonate from ethylene oxide and carbon dioxide, which mainly solves the problems of low catalyst activity and high probability of loss of active ingredients existing in the prior art. In the method, the ethylene oxide and the carbon dioxide are utilized as raw materials; the reaction raw materials are contacted with a catalyst to generatethe ethylene carbonate under the conditions of reaction temperature of 50-200 DEG C, reaction pressure of 0.1-10.0MPa and mass ratio of the catalyst to the ethylene carbonate of 0.001-1:1; and in thecatalyst, SiO2 microspheres with average diameter of 15-500nm are used as a nuclear phase, and metal salt MYn complexed by polyethyleneimine is used as a shell phase, wherein M is Ni, Zn, Cu, Fe or Co; Y is Cl, Br or I; and n is 2 or 3. The periphery of the nuclear-phase nano SiO2 spheres is wrapped by a metal salt shell layer complexed by the polyethyleneimine; the thickness of the shell layer is 0.5-8nm; and the weight ratio of the nuclear phase to the shell phase is 45/55-99.5/0.5. Due to the technical scheme, the problem is solved better; and the method can be used for industrial production of the ethylene carbonate from the ethylene oxide and the carbon dioxide.

Description

Technical field [0001] The invention relates to a method for preparing ethylene carbonate from ethylene oxide and carbon dioxide. Background technique [0002] Ethylene carbonate is an excellent solvent and fine chemical intermediate, and a potential basic raw material for organic chemical industry. At the same time, CO 2 Is a kind of greenhouse gas, how to effectively fix it has become one of the most challenging subjects of this century. And through ethylene oxide and CO 2 Reaction synthesis of ethylene carbonate is one of the good fixation methods. As the reaction of co-production of dimethyl carbonate and ethylene glycol with ethylene carbonate as a raw material has received increasing attention recently, the fixation of CO by ethylene carbonate 2 The approach of this has also received more and more attention. [0003] Most of the reported methods for producing ethylene carbonate use binary homogeneous catalysts composed of Lewis acid metal compounds and Lewis bases. The Lewi...

Claims

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Application Information

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IPC IPC(8): C07D317/38B01J31/22B01J35/10
Inventor 陈梁锋何文军
Owner CHINA PETROLEUM & CHEM CORP
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