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Catalyst for synthesizing ethylene carbonate as well as preparation method and application of catalyst

A technology of ethylene carbonate and catalyst, which is applied in the catalyst, preparation method and application field of synthesizing ethylene carbonate, can solve the problems of high production cost, high price, high cost, etc., and achieve easy separation and regeneration, many times of repeated use, and reaction The effect of mild conditions

Pending Publication Date: 2021-12-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of the raw material dimethyl carbonate or diethyl carbonate, and the low yield of the reaction, the production cost is high, and it is rarely used in industry.
The ethylene oxide method is currently the main method for the industrial production of ethylene carbonate, which uses ethylene oxide and CO 2 As raw material, ethylene carbonate is prepared by addition reaction, but because the explosion limit of ethylene oxide is broad (3-100%), and the price is expensive, this method has the characteristics of huge potential safety hazard and high cost in the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the set catalyst composition, Zn(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 O is dissolved in water respectively and is prepared into 5wt% zinc nitrate and 45wt% lanthanum nitrate aqueous solution, and the preparation concentration is 20wt% urea aqueous solution as precipitation agent simultaneously, and the preparation concentration is 1wt% sodium hydroxide aqueous solution as pH value adjusting agent.

[0025] Add the prepared zinc nitrate aqueous solution and lanthanum nitrate aqueous solution to the precipitant urea aqueous solution at 25°C for co-precipitation reaction, and dropwise add the pH value regulator sodium hydroxide aqueous solution to control the pH value of the co-precipitation process at 8 within range. After the precipitation is complete, age for 48 hours, then filter with suction, and wash the filter cake with deionized water until the eluate has no residual Na + until checked out. The obtained filter cake was dried at 80°C for 48 hou...

Embodiment 2

[0028] According to the set catalyst composition, Zn(NO 3 ) 2 ·6H 2 O and La(NO 3 )3 ·6H 2 O is dissolved in water respectively and is prepared into 25wt% zinc nitrate and 20wt% lanthanum nitrate aqueous solution, and the preparation concentration is 35wt% urea aqueous solution as precipitating agent simultaneously, preparation concentration is the sodium hydroxide aqueous solution of 5wt% as pH value regulator.

[0029] Add the prepared zinc nitrate aqueous solution and lanthanum nitrate aqueous solution to the precipitant urea aqueous solution at 40°C for co-precipitation reaction, and dropwise add the pH value regulator sodium hydroxide aqueous solution to control the pH value of the co-precipitation process to remain in the range of 13 Inside. After the precipitation is complete, age for 20 hours, then filter with suction, and wash the filter cake with deionized water until the eluate has no residual Na + until checked out. The obtained filter cake was dried at 120°C...

Embodiment 3

[0032] According to the set catalyst composition, Zn(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 O is dissolved in water respectively and is prepared into 50wt% zinc nitrate and 5wt% lanthanum nitrate aqueous solution, and the preparation concentration is 50wt% urea aqueous solution as precipitating agent simultaneously, preparation concentration is the sodium hydroxide aqueous solution of 10wt% as pH value adjusting agent.

[0033] Add the prepared zinc nitrate aqueous solution and lanthanum nitrate aqueous solution to the precipitant urea aqueous solution at 60°C for co-precipitation reaction, and dropwise add the pH value regulator sodium hydroxide aqueous solution to control the pH value of the co-precipitation process to remain in the range of 10 Inside. After the precipitation is complete, age for 22 hours, then filter with suction, and wash the filter cake with deionized water until the eluate has no residual Na + until checked out. The obtained filter cake was dried ...

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PUM

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Abstract

The invention relates to the field of preparation of ethylene carbonate, and provides a catalyst for synthesizing ethylene carbonate as well as a preparation method and an application thereof. The catalyst is a composite oxide catalyst which consists of Zn and one or two of La and Co and is used for synthesizing ethylene carbonate from urea and ethylene glycol. The preparation method comprises the following steps: mixing an aqueous solution of zinc nitrate, an aqueous solution of lanthanum nitrate and an aqueous solution of cobalt nitrate in proportion, adding the obtained mixture into a precipitant urea aqueous solution, controlling the pH value of the solution, and carrying out a co-precipitation reaction to obtain the catalyst. The preparation process of the catalyst is simple and easy to implement, and the cost is low; the catalyst is high in activity, high in ethylene carbonate yield, mild in reaction condition, good in stability and easy to separate and regenerate.

Description

technical field [0001] The invention relates to the field of ethylene carbonate preparation, in particular to a catalyst for synthesizing ethylene carbonate, a preparation method and application. Background technique [0002] Ethylene carbonate is an important organic synthesis intermediate, an important raw material for the preparation of dimethyl carbonate, furazolidone, lubricating oil, grease, and can replace ethylene oxide for dioxylation reaction; it is also a performance An excellent organic solvent, it can be used as a solvent for various polymers, a solvent for acidic gases, spinning liquid on textiles, and water glass-based slurry; it is also an additive with excellent performance, which can be used as a plastic foaming agent, Concrete additive, synthetic lubricating oil stabilizer, fiber finishing agent; it is also one of the indispensable components of high-efficiency lithium-ion battery electrolyte. [0003] The preparation methods of ethylene carbonate mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/80B01J23/83B01J37/03B01J37/08C07D317/38
CPCB01J23/10B01J23/80B01J23/83B01J23/002B01J37/031B01J37/082C07D317/38B01J2523/00B01J2523/27B01J2523/3706B01J2523/845
Inventor 肖福魁张生安杨金海滕文彬曹德龙赵宁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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