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Method for preparing alkylene carbonate

A technology of alkylene carbonate and carbon dioxide, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve problems such as difficult product separation, low catalyst activity, and easy deactivation , to achieve a good technical effect

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that there are low catalyst activity, easy deactivation and difficult product separation problems in the prior art, and a new method for preparing alkylene carbonate is provided

Method used

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  • Method for preparing alkylene carbonate
  • Method for preparing alkylene carbonate

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Experimental program
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Effect test

Embodiment 1

[0018] In the glove box, 20 grams of PEG with an average molecular weight of 400, 200 milliliters of anhydrous tetrahydrofuran, and 1.9 grams of metal potassium were added to a 500 milliliter three-necked flask, and stirred and refluxed at room temperature for 1 to 4 hours; Merrified resin (100-200 mesh, 2% cross-linking degree, 0.9 mmol Cl / g loading capacity), reflux reaction at 50-80° C. for 6-15 hours. Cool after the reaction, and add methanol and unreacted potassium. Subsequently, the upper liquid was poured out, washed with tetrahydrofuran-hydrochloric acid solution, deionized water, and methanol successively, and dried in vacuo to constant weight to obtain PS-(CH 2 CH 2 O) 9 -H microspheres A. Among them, the Merrified resin is the matrix material of the ion exchange resin catalyst, which is a copolymer of styrene and divinylbenzene, represented by PS.

[0019] Add 10 grams of PS-(CH 2 CH 2 O) 9 -H microspheres, 200 ml of dichloromethane to swell the microspheres,...

Embodiment 2

[0022] Change the resin matrix in [Example 1], use polyalkylene ester, the dosage is 5 grams, the load is 2.82mmolCl / g, the rest of the preparation conditions are the same as [Example 1], and finally M-(CH 2 CH 2 O) 9 -P + Bu 3 Br - Microspheres B.

Embodiment 3

[0024] In the glove box, add 40 grams of PEG with an average molecular weight of 2000, 500 milliliters of anhydrous tetrahydrofuran, and 0.76 grams of metal potassium into a 1000 milliliter three-neck flask, stir and reflux at 45 ° C for 1 to 6 hours; then add 10 grams of tetrahydrofuran The swollen Merrified resin (100-200 mesh, 2% cross-linking degree, 0.9 mmol Cl / g load) is refluxed at 50-90° C. for 10-20 hours. Cool after the reaction, and add methanol and unreacted potassium. Subsequently, the upper liquid was poured out, washed with tetrahydrofuran-hydrochloric acid solution, deionized water, and methanol successively, and dried in vacuo to constant weight to obtain PS-(CH 2 CH 2 O) 45 -H microspheres C.

[0025] Add 10 grams of PS-(CH 2 CH 2 O) 45 -H microspheres, 200 ml of dichloromethane to swell the microspheres, then cool to 0°C, slowly add 10 ml of phosphorus tribromide dropwise, react for 4 to 8 hours; then continue to react at room temperature for 10 to 15 ...

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Abstract

The invention relates to a method for preparing alkylene carbonate, and is mainly used for solving the problems that in the prior art, the catalyst is low in activity and easy to inactivate, and the product is hard to separate. The catalyst provided by the invention has the structural formula of M-PEG-Z<+>R3X<->, wherein M is a resin matrix selected from polyalkylene ester, copolymer of phenylethylene and divinyl benzene, polyester, polycarbonic ester, polyurethane or formaldehyde resin; PEG represents a chemical structure with the formula -(CH2CH2O)n-, and n is an integer from 1 to 150; Z is nitrogen, phosphorus or arsenic; R is methyl, ethyl, propyl, n-butyl, phenyl or aryl; and X is fluorine, chlorine, bromine, iodine, acetate, formate or hydrogen oxalate. The problems are better solved with the adoption of the technical scheme, and the method can be applied to industrial production of alkylene carbonate.

Description

technical field [0001] The present invention relates to a kind of method for preparing alkylene carbonate. Background technique [0002] Alkylene carbonates such as ethylene carbonate and propylene carbonate are organic chemical raw materials with a wide range of uses and are widely used as solvents and diluents in industry. Ethylene carbonate can be used as a solvent in textiles, printing, polymer synthesis and electrochemistry, as well as a raw material for cosmetics and medicines and an intermediate for corresponding diols. [0003] Industrially, alkylene carbonate is generally prepared by reacting carbon dioxide with the corresponding alkylene oxide under the action of a catalyst. Many catalysts have been found to have a catalytic effect on this reaction, such as transition metal complexes, main group element complexes, quaternary ammonium salts, quaternary phosphonium salts and alkali metal salts, ionic liquids, supercritical carbon dioxide and other catalytic systems....

Claims

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Application Information

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IPC IPC(8): C07D317/38C07D317/36B01J31/08
Inventor 俞峰萍何文军
Owner CHINA PETROLEUM & CHEM CORP
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