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Pretreatment method of catalyst for cyclic carbonate synthesis and application of pretreatment method

A cyclic carbonate and catalyst technology, applied in the field of pretreatment of catalysts for cyclic carbonate synthesis, can solve problems such as loss of active components, reduce equipment costs, promote cycloaddition reaction, and improve yield. Effect

Active Publication Date: 2021-09-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supported organic base catalysts, supported ionic liquid catalysts and polymer catalysts have good reaction performance, but the active components continue to lose into the product during the reaction process, which cannot essentially solve the product quality problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] With urea, Mg(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .9H 2 O, 50wt% manganese nitrate solution, NaOH and Na 2 CO 3 As a raw material, the cycloaddition reaction catalyst was prepared by using the catalyst preparation method in the patent CN 202010944228.1. The obtained catalyst was composed of: the mass ratio of magnesium aluminum manganese oxide to carbon nitride in the catalyst was 100:3, and the substances in the magnesium aluminum manganese oxide The composition is, MgO: Al 2 o 3 :MnO molar ratio is 100:20:3.

[0022] The cycloaddition reaction catalyst obtained above was treated with nitrogen gas dehydrated with 5A molecular sieves at a pressure of 1.0 MPa and a temperature of 500° C. for 4 hours. After the treatment, adjust the temperature to 200°C, and switch to the dehydrated 5A molecular sieve containing 10v% CO 2 CO 2 The catalyst was pretreated for 10 hours at a pressure of 2.0 MPa using nitrogen gas mixture.

[0023] The pretreated catalyst contained 10v%...

Embodiment 2

[0025] With melamine, Zn(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .9H 2 O, La(NO 3 ) 3 .6H 2 O, NaOH and K 2 CO 3 As a raw material, the catalyst preparation method in patent CN 202010944228.1 is used to prepare a catalyst for cycloaddition reaction. The obtained catalyst is composed of: the mass ratio of zinc-aluminum-lanthanum oxide to carbon nitride in the catalyst is 100:5, and each substance in zinc-aluminum-lanthanum oxide The composition is, ZnO: Al 2 o 3 : La 2 o 3 The molar ratio is 100:30:3.

[0026]The cycloaddition reaction catalyst obtained above was treated with nitrogen gas dehydrated with 5A molecular sieve for 5 hours at a pressure of 2.0 MPa and a temperature of 550°C. After the treatment, adjust the temperature to 300°C, and switch to the dehydrated 5A molecular sieve containing 50v% CO 2 CO 2 The catalyst was pretreated for 2.0 hours at a pressure of 4.0 MPa using argon mixed gas.

[0027] The pretreated catalyst contained 50v% CO in the above 2 Argo...

Embodiment 3

[0029] With dicyandiamide, Mg(NO 3 ) 2 .6H 2 O, Zn(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .9H 2 O, KOH and K 2 CO 3 As the raw material, the cycloaddition reaction catalyst was prepared by using the catalyst preparation method in the patent CN 202010944228.1. The obtained catalyst was composed of: the mass ratio of zinc-magnesium-aluminum oxide and carbon nitride in the catalyst was 100:4, and each substance in the zinc-magnesium-aluminum oxide The composition is, ZnO: MgO: Al 2 o 3 The molar ratio is 100:10:30.

[0030] The cycloaddition reaction catalyst obtained above was treated with nitrogen gas dehydrated with 5A molecular sieve at a pressure of 1.0 MPa and a temperature of 600° C. for 5 h. After the treatment is completed, adjust the temperature to 200°C, and switch to the dehydrated 5A molecular sieve containing 90v% CO 2 CO 2 The catalyst was pretreated for 40 hours at a pressure of 2.0 MPa using argon mixed gas.

[0031] The pretreated catalyst contained 90v% C...

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Abstract

The invention provides a pretreatment method of a catalyst for cyclic carbonate synthesis and application of the pretreatment method. A metal oxide-based catalyst is treated for 4-10 h in a nitrogen or argon atmosphere under the condition that the pressure is 0.5-2.0 MPa and the temperature is 400-600 DEG C under the off-line condition. After the treatment is finished, adjusting the temperature to 130-300 DEG C, switching to CO2-nitrogen / argon mixed gas containing 5-100v% of CO2, and carrying out pretreatment on the catalyst for 2-60 hours under the pressure of 1.0-4.0 MPa. According to the method, the structure and the surface acid-base property of the catalyst are regulated and controlled through pretreatment of the metal oxidation-based catalyst, synergistic activation of epoxide and CO2 is achieved, the yield of cyclic carbonate is increased, meanwhile, the catalyst is pretreated through an off-line scheme, the cost of cycloaddition reaction equipment can be remarkably reduced, and the economical efficiency of the process can be improved.

Description

technical field [0001] The invention belongs to the field of heterogeneous catalysis, and in particular relates to a pretreatment method and application of a catalyst for synthesizing cyclic carbonate. Background technique [0002] carbon dioxide (CO 2 ) is the most important greenhouse gas that causes global warming, and its global annual emissions have reached tens of billions of tons. Its recovery, fixation and resource utilization have become a problem that countries all over the world pay close attention to. From the perspective of resource utilization, CO 2 It is the most abundant and cheap carbon resource in the world, therefore, vigorously develop CO 2 It is of great economic and environmental significance to make green use of technology, develop a green, high-tech fine chemical industry chain, and increase the added value of products. [0003] Cyclic carbonate is an important organic chemical product and a high-boiling polar solvent with excellent performance. It...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/10B01J23/06B01J23/04B01J23/92B01J38/02B01J38/04C07D317/38C07D317/36
CPCB01J23/34B01J23/10B01J23/06B01J23/04B01J23/92B01J38/02B01J38/04C07D317/38C07D317/36B01J2523/00B01J2523/22B01J2523/31B01J2523/72B01J2523/27B01J2523/3706B01J2523/12B01J2523/23Y02P20/584
Inventor 李德宝郭荷芹陈从标贾丽涛侯博
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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