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Nuclear-shell catalyst applied to preparation of ethylene carbonate from epoxy ethane and carbon dioxide and preparation method thereof

A technology of ethylene carbonate and carbon dioxide, applied in the field of core-shell catalyst and its preparation, can solve the problems of low catalyst activity and easy loss of active components, and achieve 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

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems 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 core-shell catalyst for preparing ethylene carbonate from ethylene oxide and carbon dioxide is provided

Method used

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  • Nuclear-shell catalyst applied to preparation of ethylene carbonate from epoxy ethane and carbon dioxide and preparation method thereof
  • Nuclear-shell catalyst applied to preparation of ethylene carbonate from epoxy ethane and carbon dioxide and preparation method thereof
  • Nuclear-shell catalyst applied to preparation of ethylene carbonate from epoxy ethane and carbon dioxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] 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

[0020] 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

[0024] 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.

[0025] Table 1

[0026]

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Abstract

The invention relates to a nuclear-shell catalyst applied to preparation of ethylene carbonate from epoxy ethane and carbon dioxide and a preparation method thereof, which are mainly used for solving the problems of low catalyst activity and easy loss of active ingredients existing in the prior art. In the preparation method, SiO2 microspheres of which the average diameter is 15-500 nanometers are taken as a nuclear phase, and metal salt MYn compounded with polyethylene imine is taken as a shell phase, wherein M is Ni, Zn, Cu, Fe or Co; Y is Cl, Br or I; n is 2 or 3; the periphery of the nuclear phase SiO2 microspheres is coated with a metal salt shell phase compounded with polyethylene imine; the thickness of the shell phase is 0.5-8 nanometers; the weight ratio of polyethylene imine to the metal salt in the shell phase is 0.3-10; and the weight ratio of the nuclear phase to the shell phase is 45:55-99.5:0.5. By adopting the technical scheme, the problems are well solved; and the nuclear-shell catalyst can be applied to industrial production of ethylene carbonate prepared from epoxy ethane and carbon dioxide.

Description

technical field [0001] The invention relates to a core-shell catalyst for preparing ethylene carbonate from ethylene oxide and carbon dioxide and a preparation method thereof. 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 greenhouse gas, how to effectively fix has become one of the most challenging issues in this century. And through ethylene oxide and CO 2 Reactive synthesis of ethylene carbonate is one of the good fixation methods. With the recent increasing attention to the co-production of dimethyl carbonate and ethylene glycol using ethylene carbonate as raw material, CO fixation via ethylene carbonate 2 approach has also received increasing attention. [0003] Most of the reported methods for producing ethylene carbonate are binary homogeneous catalysts using Lewis acid metal compounds and Lewis bases, wherein the...

Claims

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Application Information

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