Method for preparing ethyl glycol by hydrolysis of ethylene carbonate

A technology of ethylene carbonate and ethylene glycol, applied in the field of ethylene carbonate hydrolysis to prepare ethylene glycol, can solve problems such as unreported, difficult to obtain high-quality MEG, etc., and achieves good selectivity, low catalyst dosage, and fast reaction speed. Effect

Inactive Publication Date: 2007-06-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Dow Chemical Company [WO: 98/14419, 1999] reported the conditions for the synthesis of MEG by the hydrolysis of EC catalyzed by alkali metal carbonate or bicarbonate, and the conversion rate of EC was improved by increasing the reaction time, but i

Method used

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  • Method for preparing ethyl glycol by hydrolysis of ethylene carbonate
  • Method for preparing ethyl glycol by hydrolysis of ethylene carbonate

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Effect test

Embodiment 1

[0022] Using methyl butylimidazolium sulfate as a catalyst, the amount of catalyst is 1%, and the molar ratio of water / ethylene carbonate is 2.7. The reaction is carried out at 140° C. for 3 hours. As a result, the hydrolysis conversion rate of ethylene carbonate was 100%, and the selectivity of ethylene glycol was 100%. After vacuum distillation, the catalyst was reused and the conditions were unchanged. As a result, the hydrolysis conversion rate of ethylene carbonate was 98.9%, and the selectivity of ethylene glycol was 100%.

Embodiment 2

[0024] Using methyl butyl imidazolium phosphate as a catalyst, the amount of catalyst is 1%, and the molar ratio of water / ethylene carbonate is 2.4. The reaction is carried out at 130° C. for 3 hours. As a result, the hydrolysis conversion rate of ethylene carbonate was 85%, and the selectivity of ethylene glycol was 100%.

Embodiment 3

[0026] Methyl butyl imidazolium bromide is used as a catalyst, the amount of catalyst is 1%, and the molar ratio of water / ethylene carbonate is 1.6. The reaction is carried out at 140° C. for 3 hours. As a result, the hydrolysis conversion rate of ethylene carbonate was 70%, and the selectivity of ethylene glycol was 100%.

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Abstract

The invention relates to a method for preparing ethylene alcohol through hydrolysis of the carbonate ethylene glycol ester. It takes the glyoxaline as the catalyst, and the carbonate ethylene glycol ester hydrolysis to get ethylene alcohol under the temperature of 80 ~ 180 C degree. The catalyst and product can be separated through distillation, and the catalyst can be reused.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol by hydrolyzing ethylene carbonate. Background technique [0002] my country's large-scale ethylene glycol (MEG) production mainly adopts the patented technologies of the world's three major companies, SD, Shell, and UCC. The direct hydration of ethylene oxide has become the only process technology in my country. The production process is long, with many equipments and high energy consumption, which directly affects the production cost of ethylene glycol. At present, my country's production enterprises have not yet mastered advanced production processes and technologies, such as new catalyst technology, ethylene glycol product post-processing production technology, etc., and are simply unable to compete with foreign products produced with advanced technologies, and these technologies are crucial to future competition. important. Therefore, the development of ethylene glycol technology with...

Claims

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Application Information

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IPC IPC(8): C07C29/12C07C31/20C07D233/58
Inventor 夏春谷许传芝陈静张愔李臻
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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