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Catalytic method for preparing dimethyl cabonate along with ethylene glycol

A technology of dimethyl carbonate and ethylene glycol, which is applied in clean catalysis and green fields, and can solve problems such as incompatibility

Active Publication Date: 2011-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the catalysts of carbonylation reaction and transesterification reaction are not compatible, and it is often necessary to separate the intermediate ethylene carbonate

Method used

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  • Catalytic method for preparing dimethyl cabonate along with ethylene glycol
  • Catalytic method for preparing dimethyl cabonate along with ethylene glycol
  • Catalytic method for preparing dimethyl cabonate along with ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (a) Implementation method: In a 100mL stainless steel autoclave, add 0.2mol of ethylene oxide, 4mmol of 1-butyl-3-methylimidazole brominated by composite catalyst, K 2 CO 3 1mmol, airtight reaction kettle, filled with carbon dioxide of appropriate pressure, controlled temperature by temperature controller to slowly rise to 393K, then control carbon dioxide pressure to 2.0MPa, react for 1 hour, cool to room temperature, unload the kettle, excess carbon dioxide with saturated sodium carbonate solution absorption, and the resulting mixed solution was analyzed by gas chromatography, the product selectivity was 99%, and the yield was 98%.

[0014] (b) Implementation method: add methanol 1.6mol in the original reactor and the ethylene carbonate and composite catalyst mixed solution generated in (a), seal the reactor, and slowly rise to 383K by the temperature controller, and react 1

[0015] h, cooled to room temperature, and the resulting mixed solution was analyzed by gas ...

Embodiment 2

[0017] (a) implementation method: with embodiment 1, add composite catalyst chloride 1-ethyl-3-methylimidazole 2mmol, Na 2 CO 3 1 mmol, the time is 6 hours, and other things are unchanged, the selectivity of ethylene carbonate is 99%, and the yield is 98%.

[0018] (b) Implementation method: with embodiment 1, add methyl alcohol 0.8mol, other is constant, obtains ethylene carbonate conversion rate 62%, the selectivity of ethylene glycol 99%, the selectivity of dimethyl carbonate is 99%.

Embodiment 3

[0020] (a) implementation method: with embodiment 1, add composite catalyst iodide 1-dodecyl-3-methylimidazole 2mmol, K 2 CO 3 2mmol, the reaction pressure is 10MPa, and other things remain unchanged, the selectivity of ethylene carbonate is 99%, and the yield is 97%.

[0021] (b) Implementation method: with embodiment 1, the time is 0.5 hour, other is constant, obtains ethylene carbonate transformation rate 68%, the selectivity 99% of ethylene glycol, the selectivity of dimethyl carbonate is 99%.

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Abstract

The invention relates to a catalytic method for preparing dimethyl cabonate along with ethylene glycol. The invention is characterized in that ethylene oxide and carbon dioxide are used as raw materials to prepare ethylene carbonate under the catalysis of a composite catalyst; the composite catalyst and cyclic carbonate are not separated and are used to further catalyze the reaction of ethylene carbonate and methanol and prepare dimethyl cabonate and ethylene glycol. The synthesis method is characterized by high catalyst activity, low cost, long service life and the like.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, and specifically refers to a composite catalyst catalyzed by using ethylene oxide and carbon dioxide as raw materials to prepare ethylene carbonate through carbonylation, and cyclic ethylene carbonate and methanol to prepare dimethyl carbonate through transesterification Ethylene glycol co-production method, and the catalyst can be recycled. Background technique: [0002] Dimethyl carbonate is a non-toxic, biodegradable, environmentally friendly green basic chemical raw material, which can be used as a solvent, gasoline additive, lithium-ion battery electrolyte, bisphenol A polycarbonate monomer and carbonylation, formazan Oxylation and carbonyl methylation reagents are widely used in the chemical industry. Ethylene glycol is an important organic chemical raw material, mainly used in the production of polyester. With the rapid development of my country's polyester industry in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/06C07C31/20C07C29/128C07C27/00B01J31/02B01J27/08B01J27/232
CPCY02P20/52
Inventor 张锁江王金泉孙剑成卫国张香平张增亮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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