Method for preparing ethylene glycol by ethylene carbonate method

A technology of ethylene carbonate and ethylene glycol is applied in the field of preparing ethylene glycol by ethylene carbonate method, which can solve the problems of unrealized industrial application and the like, and achieve the effects of small pressure fluctuation, high practical feasibility and reduced energy consumption.

Inactive Publication Date: 2012-07-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At the end of the 1970s, Halcon-SD Company of the United States, UCC United Carbon Company, DOW Dow Chemical, ICI Imperial Chemical Industry Company of the United Kingdom, Japan Catalyst Chemical Industry Company, Mitsubishi Chemical Company, and Showa Denko successively developed the hydrolysis method of ethylene carbonate. The process technology for synthesizing ethylene glycol, but due to various reasons, it did not realize industrial application at that time
In view of the problems about the control of by-product DEG generation, the circulation of esterification / hydrolysis catalyst, and the separation of catalyst and product that are not mentioned in the prior art, it is necessary to develop a new preparation process by selecting a suitable catalyst, optimizing process conditions and processes To meet the requirements of industrial production

Method used

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  • Method for preparing ethylene glycol by ethylene carbonate method
  • Method for preparing ethylene glycol by ethylene carbonate method
  • Method for preparing ethylene glycol by ethylene carbonate method

Examples

Experimental program
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Effect test

Embodiment 1

[0063] (1) Treatment of raw material EO

[0064] The ethylene oxidation product enters the cooling and refining unit after being washed with water and desorbed. The EO gas at the top of the tower is condensed from 34°C to 5°C. The total molar mass is 1.81kmol / hr. 2 1.21mol%, H 2 O 4.00mol%, CH 4 0.23mol%, C 2 h 4 0.63mol%, after cooling and refining through a packed tower with 5 theoretical plates, EO-rich liquid with a water content of about 1.7wt% is obtained, the operating pressure is 0.10-0.15MPa, water is basically removed, CH 4 , CO 2 And other insoluble gases are recovered from the top of the tower.

[0065] (2) Esterification reaction process

[0066] The EO-rich liquid obtained by cooling and refining is preheated and mixed with the supplemented circulating metal zinc complex catalyst in a preheating mixer, and then passed into the bubble column reactor, while bubbling CO 2 Recycle gas, the operating temperature is 140°C, the operating pressure is 4MPa, the m...

Embodiment 2

[0074] (1) Preparation of raw material solution

[0075] The ethylene oxidation product enters the cooling and refining unit after being washed with water and desorbed. The EO gas at the top of the tower is condensed from 47°C to 5°C through industrial water and liquid ammonia. The total molar mass is 1.94kmol / hr. 2 1.49mol%, H 2 O 8.28mol%, CH 4 0.30mol%, C 2 h 4 0.76mol%, after cooling and refining through a packed tower with 5 theoretical plates, EO-rich liquid with a water content of about 3.3wt% is obtained, the operating pressure is 0.10-0.15MPa, water is basically removed, CH 4 , CO 2 And other insoluble gases are recovered from the top of the tower.

[0076] (2) Esterification reaction process

[0077] The EO-rich liquid obtained by cooling and refining is preheated and mixed with the supplemented circulating metal zinc complex catalyst in a preheating mixer, and then passed into the bubble column reactor, while bubbling CO 2 Recycle gas, the operating temper...

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Abstract

The invention discloses a method for preparing ethylene glycol by an ethylene carbonate method. By using the method, the EO (ethylene oxide) conversion rate and the EC (ethyl cellulose) selectivity are greatly improved. The method mainly comprises the following steps of: removing the vast majority of non-condensable impurity gas contained in the mixed gas obtained by ethylene epoxidation in a washing tower, and introducing washing liquor into a desorber for desorbing, to obtain crude EO raw material gas; cooling and refining the crude EO raw material gas in a packed tower to obtain a high-concentration EO raw material; carrying out esterification on the high-concentration EO raw material liquid and CO2 to generate EC; and recovering a thick catalyst solution obtained by a tower kettle to an esterification work section to be recycled; carrying out a heterogeneous hydrolysis reaction on the EC product obtained by means of esterification and vacuum rectification and water which is approximate to a stoichiometric ratio in a hydrolysis reactor to obtain a target product EG (ethylene glycol), and separating out the byproduct CO2 and then circulating the byproduct CO2 to an esterification reactor to be reused; and refining the EG generated by the hydrolysis reaction in a refining tower to obtain the high-purity EG target product.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol, in particular to a method for preparing ethylene glycol by an ethylene carbonate method. Background technique [0002] As an important basic organic chemical raw material, ethylene glycol (EG) is mainly used in the production of polyester fibers, polyester plastics, unsaturated polyester resins, polyester paints and the preparation of automobiles and aviation industries and instrumentation An important antifreeze agent for cooling and supplementation in industry, as well as the production of solvents, lubricants, plasticizers and explosives. [0003] In recent years, with the rapid growth of consumption in the global polyester product market, the production of EG in the world has developed rapidly. In 2006, the total production capacity of EG in the world was only 19.555 million tons. In 2009, it increased to 23.135 million tons. In 2010, with the completion and operation of multiple set...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/12C07D317/38
CPCY02P20/52Y02P20/584
Inventor 刘晓勤刘定华沈文彬孙林兵
Owner NANJING UNIV OF TECH
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