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Process for synthesizing cyclic carbonate

A carbon dioxide and epoxy compound technology, applied in the direction of organic chemistry, can solve the problems of low catalytic activity, difficult recovery of catalysts for product separation, etc., and achieve the effects of high product purity, low vapor pressure, and simple catalyst system

Inactive Publication Date: 2002-04-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of catalysts reported, there are still problems such as low catalytic activity, product separation and catalyst recovery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 5 moles of propylene oxide and 60 millimoles of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid catalyst and 15 millimoles of tetrabutylammonium bromide cocatalyst into a 5-liter stainless steel high-pressure reactor After replacing the air in the kettle with carbon dioxide gas, carbon dioxide gas was introduced under stirring, and the reaction kettle was weighed so that the molar ratio of carbon dioxide and propylene oxide added was 1.3:1. The reaction kettle was sealed, and the temperature was slowly raised to 110° C. under stirring for 6 hours. After cooling to room temperature, excessive carbon dioxide gas was released, and the liquid obtained from the reaction was analyzed by GC / MS, and then the product propylene carbonate was collected by vacuum distillation with a yield of 91.2%.

Embodiment 2

[0021] Add 5 moles of ethylene oxide, 60 millimoles of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid catalyst and 15 millimoles of tetrabutylammonium bromide cocatalyst into a 5 liter stainless steel reactor After replacing the air in the kettle with carbon dioxide gas, carbon dioxide gas was introduced under stirring, and the reaction kettle was weighed so that the molar ratio of carbon dioxide and ethylene oxide added was 1.3:1. The reaction kettle was sealed, and the temperature was slowly raised to 110° C. under stirring for 6 hours. Cool to room temperature, release excess carbon dioxide gas, carry out GC / MS analysis to the liquid obtained by reaction, carry out normal pressure distillation, recover the unreacted ethylene oxide, then collect the product ethylene carbonate by vacuum distillation, the yield is 85.6% .

Embodiment 3

[0023] Add 5 moles of epichlorohydrin, other operations and reaction conditions are the same as Example 1, and the yield of chloropropylene carbonate is 91.0%.

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PUM

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Abstract

A process for preparing cyclic carbonate features that catalytic cycloaddition reaction of CO2 on epoxy compound at 100-140 deg.C and 1.5-4.5 MPa for 4-8 hrs under the existance of the catalyst whichis composed of azacyclic compound (halogenated alkylpyridine or halogenated 1,3-dialkyl imidazole) and non-metal halide, and the cocatalyst which is alkali-metal halide or ammonium tetrebutyl bromide. Its advantages are high catalytic activity, smooth reaction condition, easy separation of resultant from catalyst, and cyclic use of catalyst.

Description

technical field [0001] The invention relates to a method for synthesizing cyclic carbonates with high efficiency, convenience and relatively mild reaction conditions. Background technique [0002] Cyclic carbonates are high-boiling-point and high-polarity organic solvents with excellent properties, and are widely used in organic synthesis, cosmetics, gas separation, battery dielectrics, and metal extraction. In recent years, many urea manufacturers have used propylene carbonate as a decarburizing agent, which has greatly increased the demand. The synthesis methods of cyclic propylene carbonate mainly include phosgene method, transesterification method and cycloaddition of epoxy compounds and carbon dioxide. Among them, the cycloaddition of cyclic carbonates with epoxy compounds and carbon dioxide as raw materials in the presence of catalysts is a low-pollution, environmentally friendly synthetic route, and its research and development has received widespread attention. The...

Claims

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Application Information

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IPC IPC(8): C07D317/40C07D319/04
Inventor 邓友全彭家建石峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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