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Method for preparing ethylene carbonate from ethylene oxide and carbon dioxide

A technology of ethylene carbonate and ethylene oxide, which is used 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 achieves the effect of high activity

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 components in the prior art, and a new method for preparing ethylene carbonate from ethylene oxide and carbon dioxide is provided

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  • Method for preparing ethylene carbonate from ethylene oxide and carbon dioxide
  • Method for preparing ethylene carbonate from ethylene oxide and carbon dioxide
  • Method for preparing ethylene carbonate from ethylene oxide and carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 18.0 ml of 25% by weight concentrated ammonia water to a mixed solution of 80.0 ml of deionized water and 890.0 ml of ethanol (the molar ratio of ammonia to ethanol is 0.016, and the molar ratio of deionized water to ethanol is 0.29). In the presence of 40W ultrasonic waves, 41.6 g of tetraethyl orthosilicate (TEOS, the molar ratio of TEOS to ethanol is 0.013) was added dropwise to the mixed solution. After the dropwise addition, the ultrasonic treatment with the same power was continued for 3 hours, and then the precipitate was separated by centrifugation. After washing with deionized water, the resulting SiO 2 The nanospheres were re-dispersed ultrasonically in 200 ml of deionized water, and then 200 ml of an aqueous solution containing 3.3 g of polyethyleneimine (PEI, average molecular weight 1600) and 5.1 g of KCl (PEI and SiO 2 The weight ratio of nanospheres is 0.29, KCl and SiO 2 The weight ratio of nano-microspheres is 0.45). After stirring at 60°C for 4 ...

Embodiment 2

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

Embodiment 3～6

[0023] Change the amount of concentrated ammonia water used, the average molecular weight of the PEI used is 6600, all the other operating steps are the same as [Example 1], the core phase / shell phase weight ratio of the obtained core-shell catalyst, PEI and ZnCl 2 The weight ratio is consistent with [Example 1], the core phase SiO of the core-shell catalyst 2 The average diameter and thickness of the shell phase of the microspheres 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 present 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 chemicals. At the same time, CO 2 It is a greenhouse gas, and how to effectively fix it has become one of the most challenging issues in 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 using ethylene carbonate as raw material has recently attracted increasing attention, CO fixation through ethylene carbonate 2 approach has also received more and more attention. [0003] Most of the currently reported methods for producing ethylene carbonate use a binary homogeneous catalyst composed of a Lewis acid metal compound and a Lewis base. Th...

Claims

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Application Information

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