Method for preparation of ethylene glycol by hydrolysis of ethylene carbonate

A technology of ethylene carbonate and ethylene glycol, which is applied in the field of ethylene carbonate hydrolysis to prepare ethylene glycol, can solve the problems of rapid activity decline, easy swelling, and resin catalysts are not temperature-resistant, and achieve the effect of enhancing swelling resistance.

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there are problems in the prior art that the resin catalyst is not resistant to

Method used

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  • Method for preparation of ethylene glycol by hydrolysis of ethylene carbonate
  • Method for preparation of ethylene glycol by hydrolysis of ethylene carbonate
  • Method for preparation of ethylene glycol by hydrolysis of ethylene carbonate

Examples

Experimental program
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Example Embodiment

[0029] [Example 1]

[0030] Add 58.0 g of styrene, 0.6 g of divinylbenzene, 30 g of polystyrene and 0.6 g of benzoyl peroxide initiator into a 500 ml three-necked flask, stir at 60°C for 2.0 hours; then add 2.8 g of multi-walled carbon Nanotubes, continue to stir for 1 hour for pre-polymerization. 260 ml of deionized water solution in which 2.5 g of polyvinyl alcohol has been dissolved is added. Adjust the stirring speed while gradually increasing the temperature to 80°C and react for 5 hours; then increase the temperature to 90°C and react for 5 hours, and finally heat up to 98°C and react for 6 hours. After the reaction, the upper liquid was poured out, washed with hot water at 85°C, then washed with cold water, then filtered, dried in an oven at 80°C, sieved, and collected composite microspheres with a particle size in the range of 0.35~0.60 mm A.

[0031] Chloromethylation of composite microspheres: In a 500 ml three-necked flask, add 50 grams of composite microspheres A and...

Example Embodiment

[0036] [Example 2]

[0037] In a 500 ml three-necked flask, add 20 g of the composite chlorine ball A obtained in [Example 1], 150 ml of toluene, and 35.0 g of N-propenylimidazole, and stir and react under reflux for 30 hours. After the reaction, the mother liquor is removed by filtration. Wash with dichloromethane, acetone and water respectively, and dry under vacuum to obtain chlorine type composite imidazole-based resin A3.

[0038] Transformation of chlorine-type composite imidazole-based resin: In a 200ml beaker, add 10 grams of chlorine-type composite imidazole-based resin A3 and 20 grams of KHCO 3 And 40 grams of deionized water, stirred at room temperature for 18 hours, filtered, washed with deionized water, repeated the above process twice, filtered, washed with deionized water, and dried under vacuum to obtain the exchange type composite imidazole-based resin A4.

Example Embodiment

[0039] [Example 3]

[0040] A 500 ml three-necked flask was charged with a monomer mixture solution containing initiator (60.0 g styrene, 1.7 g divinylbenzene, 60 g polystyrene, 1.6 g multi-walled carbon nanotubes and 1.0 g benzoyl peroxide, The solution was stirred and reacted at 70°C for 0.5 hours), started the stirrer, added a mixed solution of 200ml deionized water and 5g gelatin, heated to 85°C, reacted for 3 hours, then heated to 90°C, reacted for 9 hours, and finally The temperature was raised to 100°C and reacted for 10 hours. After the reaction, the upper liquid was poured out, washed with hot water at 85°C, then washed with cold water, then filtered, dried in an oven at 80°C, sieved, and collected composite microspheres with a particle size in the range of 0.35~0.60 mm B.

[0041] Chloromethylation of composite microspheres: In a 500 ml three-necked flask, add 50 grams of composite microspheres B and 150 ml of chloromethyl ether, let stand at room temperature for 6 hour...

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Abstract

The invention relates to a method for preparation of ethylene glycol by hydrolysis of ethylene carbonate, and mainly solves the problems of easy swelling and rapid activity decline of resin in the prior art. According to an adopted technical scheme, under the conditions of a reaction temperature of 60-180DEG C, a water-to-ethylene carbonate molar ratio of 1-10, and a catalyst-to-ethylene carbonate weight ratio of 0.005-1, the reaction raw materials and the catalyst contact for 1-8h to produce ethylene glycol; and the catalyst is exchange type composite imidazolyl resin. The method well solves the problems, and can be used for the industrial production of ethylene glycol by hydrolysis of ethylene carbonate.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol by hydrolyzing ethylene carbonate. Background technique [0002] The hydrolysis of esters is an important chemical reaction, which is widely used in various fields of petrochemical production, among which the hydrolysis of cyclic carbonates, such as ethylene carbonate (EC), propylene carbonate, etc., has a very important basic position . [0003] The hydrolysis of EC is an important step in the production of ethylene glycol (EG) by the two-step catalytic hydration of ethylene oxide (EO). EG is an important organic chemical raw material, mainly used to produce polyester fiber, antifreeze, unsaturated polyester resin, nonionic surfactant, ethanolamine and explosives. The production technology of EG is mainly divided into petrochemical route and non-petrochemical route. In the petrochemical route, there are EO direct hydration method and EO catalytic hydration method. The direct hydration ...

Claims

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Application Information

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IPC IPC(8): C07C29/12C07C31/20B01J31/08
CPCY02P20/52
Inventor 陈梁锋何文军
Owner CHINA PETROLEUM & CHEM CORP
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