Method for preparing dibasic alcohol

A diol and carbon dioxide technology, which is applied in the field of diol preparation, can solve problems such as difficulty in obtaining high-quality ethylene glycol, incomplete conversion of cyclic carbonates, and low selectivity of diols, and achieve effective The effect of utilization, high stability, and convenient circulation

Inactive Publication Date: 2011-05-18
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF2 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dow Chemical Company [WO: 98/14419, 1999] reported the conditions for the synthesis of ethylene glycol by catalyzing the hydrolysis of ethylene carbonate by alkali metal carbonate or bicarbonate, and improved the conversion rate of ethylene carbonate by increasing the reaction time, but it is difficult to obtain high quality ethylene glycol
[0005] And use the method for transesterification of cyclic carbonate and methyl alcohol to prepar

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing dibasic alcohol
  • Method for preparing dibasic alcohol
  • Method for preparing dibasic alcohol

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041]

[0042] In a 100 ml autoclave, add 0.05 mmol of metal salt zinc chloride, 0.5 mmol of ionic liquid 1-methyl-3-butylimidazole bromide and 0.4 mmol of tetrabutylammonium bromide, and finally add 20 ml of epoxy Propane (1a), the reactor is closed, the temperature is slowly raised to 100°C by the temperature controller, the reaction pressure is maintained at 1.5MPa, the reaction is for 1 hour, cooled to room temperature, the kettle is unloaded, the liquid obtained from the reaction is subjected to vacuum distillation to separate the catalyst, Then the corresponding cyclic carbonate (2a) is obtained. In the autoclave, 2.8 grams of polystyrene-supported N-methylimidazole bicarbonate ionic liquid and 12.96 grams of water were sequentially added to produce 40.9 grams of propylene carbonate (2a). The reactor is sealed, and the temperature is slowly raised to 140°C by a temperature controller, and the reaction pressure is maintained at 1.5MPa. After reacting for...

Example Embodiment

[0043] Example 2

[0044] Same as Example 1, the metal salt used in the synthesis reaction is zinc bromide, the selectivity of propylene glycol (3a) is 99%, and the yield is 99%;

Example Embodiment

[0045] Example 3

[0046] Same as Example 1, the co-catalyst used in the synthesis reaction is 1-methyl-3-butylimidazole chloride salt 0.05mmol, N-butylpyrimidine bromide salt, the selectivity of propylene glycol (3a) is 99%, and the yield is 99%;

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preparing dibasic alcohol by hydrolyzing cyclic carbonate prepared from an epoxy compound and carbon dioxide. A system consisting of metal salt, ionic liquid and quaternary ammonium salt is taken as a catalyst in addition reaction, the cycloaddition of the carbon dioxide and the compound is catalyzed to prepare the cyclic carbonate, and the cyclic carbonate from which the catalyst is separated is subjected to hydrolysis reaction in the presence of a supported alkaline ionic liquid catalyst. The method can overcome the defects of high energy consumption and water ratio in the process of directly hydrating the epoxy compound, and also can overcome the defects of low conversion rate and selectivity of the method for preparing the dibasic alcohol through the ester exchange of the cyclic carbonate and methanol.

Description

technical field [0001] The present invention relates to a kind of preparation method of dibasic alcohol, more specifically, the present invention relates to a kind of method of preparing dibasic alcohol by hydrolysis of cyclic carbonate by epoxy compound and carbon dioxide. Background technique [0002] Dihydric alcohols, especially ethylene glycol, are widely used. They can be used to synthesize polymer compounds such as "polyester" (dacron), and can also be used as raw materials for films, rubber, plasticizers, desiccants, and brake fluids. Boiling point solvents, antifreeze for car radiators and refrigerants for aircraft engines. Ethylene glycol can also be used as a wetting agent for cellophane, fibers, leather, and adhesives. The vapor produced by heating ethylene glycol can be used as a stage smoke screen, and the nitrate ester of ethylene glycol is an explosive. [0003] China's large-scale ethylene glycol production mainly adopts the patented technologies of the wo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C29/09C07C31/20
Inventor 夏春谷许传芝张愔陈静
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap