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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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  • Summary
  • 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 temperature, easy to swell, and the activity drops rapidly, and a new method for preparing ethylene glycol by hydrolysis of ethylene carbonate is provided

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
Comparison scheme
Effect test

Embodiment 1

[0030] Add 58.0 grams of styrene, 0.6 grams of divinylbenzene, 30 grams of polystyrene and 0.6 grams of benzoyl peroxide initiator in a 500 milliliter three-necked flask, and stir for 2.0 hours at 60°C; then add 2.8 grams of multi-walled carbon Nanotubes, continue stirring for 1 hour for pre-polymerization. 260 mL of deionized water in which 2.5 g of polyvinyl alcohol had been dissolved was added. Adjust the stirring speed, while gradually raising the temperature to 80°C, and react for 5 hours; then raise the temperature to 90°C, react for 5 hours, and finally raise the temperature to 98°C, and react for 6 hours. After the reaction, pour out the upper liquid, wash with 85°C hot water, then wash with cold water, then filter, put in an oven to dry at 80°C, sieve, and collect composite microspheres with a particle size within the range of 0.35 to 0.60 mm a.

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

Embodiment 2

[0037]In a 500 milliliter three-necked flask, add 20 grams of composite chlorine spheres A obtained in [Example 1], 150 milliliters of toluene, and 35.0 grams of N-propenylimidazole, stir and react under reflux for 30 hours, filter and remove the mother liquor after the reaction finishes, Wash with dichloromethane, acetone and water successively, and dry under vacuum to obtain chlorine-type composite imidazole-based resin A3.

[0038] Transformation of chlorine-type composite imidazole-based resin: In a 200 ml beaker, add 10 grams of chlorine-type composite imidazole-based resin A3, 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 2 times, filtered, washed with deionized water, dried under vacuum to obtain the exchange type composite imidazole-based resin A4.

Embodiment 3

[0040] Add monomer mixture solution (60.0 gram styrene, 1.7 gram divinylbenzene, 60 gram polystyrene, 1.6 gram multi-walled carbon nanotube and 1.0 gram benzoyl peroxide containing initiator in 500 milliliters of three-necked flasks, The solution was first stirred and reacted at 70°C for 0.5 hours), started the agitator, added a mixed solution of 200 milliliters of deionized water and 5 grams of gelatin, raised the temperature to 85°C, reacted for 3 hours, then raised the temperature to 90°C, reacted for 9 hours, and finally The temperature was raised to 100° C., and the reaction was carried out for 10 hours. After the reaction, pour out the upper liquid, wash with 85°C hot water, then wash with cold water, then filter, put in an oven to dry at 80°C, sieve, and collect composite microspheres with a particle size within the range of 0.35 to 0.60 mm b.

[0041] Chloromethylation of composite microspheres: In a 500-ml three-necked flask, add 50 grams of composite microspheres B ...

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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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