Method for simultaneously producing dimethyl carbonate and dimethyl ether through urea alcoholysis process, catalyst used thereby, and preparation method of catalyst

A technology of dimethyl carbonate and catalyst, which is applied in the field of urea alcoholysis for co-production of dimethyl carbonate and dimethyl ether, which can solve the problems of complex reactor structure and operating conditions, low conversion rate of raw materials and low yield of dimethyl carbonate

Inactive Publication Date: 2014-03-12
YASHENTECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the defects of the existing urea alcoholysis process for preparing dimethyl carbonate, the raw material conversion rate and dimethyl carbonate acquisition rate are low, the reactor structure and operating conditions are com

Method used

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  • Method for simultaneously producing dimethyl carbonate and dimethyl ether through urea alcoholysis process, catalyst used thereby, and preparation method of catalyst
  • Method for simultaneously producing dimethyl carbonate and dimethyl ether through urea alcoholysis process, catalyst used thereby, and preparation method of catalyst
  • Method for simultaneously producing dimethyl carbonate and dimethyl ether through urea alcoholysis process, catalyst used thereby, and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0101] Raw materials: Mg(NO 3 ) 2 ·6H 2 O, Al 2 o 3 ,Deionized water.

[0102] Preparation process: 13.3gMg(NO 3 ) 2 ·6H 2 O was dissolved in 30ml of water to form a solution, and 7.9g of dried Al 2 o 3 Sample, mix the two evenly and let stand for 60 minutes. Stir and dry under an infrared lamp, and then place in an oven at 110°C to dry. Calcined in air atmosphere at 850°C for 8 hours.

[0103] Product: The obtained catalyst sample contains about 20wt% MgO, Al 2 o 3 About 80% by weight.

example 2

[0105]Raw material: Ni(NO 3 ) 2 ·6H 2 O, Al 2 o 3 ,Deionized water.

[0106] Preparation process: 25.3g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 38ml water to form a solution, and 11.5g of dried Al 2 o 3 Sample, mix the two evenly and let stand for 30 minutes. Stir and dry under an infrared lamp, and then place in an oven at 100°C to dry. Calcined in air atmosphere at 800°C for 6 hours.

[0107] Product: The obtained catalyst sample contains about 36wt% NiO, Al 2 o 3 About 64% by weight.

example 3

[0109] Raw material: LiNO 3 , Zn(NO 3 ) 2 ·6H 2 O, Al 2 o 3 ,Deionized water.

[0110] Preparation process: 12.5g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of water to form a solution, and 5.6g of dried Al 2 o 3 Sample, mix the two evenly and let stand for 60 minutes. Stir and dry under an infrared lamp, and then place in an oven at 100°C to dry. Sample A was obtained by calcining at 850° C. in an air atmosphere for 12 hours. 0.8g LiNO 3 Dissolve it in 19ml of water to make a solution, mix it evenly with sample A, dry it under an infrared lamp, and then place it in an oven at 120°C. Finally, it was calcined in an air atmosphere at 500° C. for 3 hours.

[0111] Product: The resulting catalyst sample contains Li 2 O about 4wt%, ZnO about 37wt%, Al 2 o 3 About 59% by weight.

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Abstract

The invention provides a method for simultaneously producing dimethyl carbonate and dimethyl ether through a urea alcoholysis process, a catalyst used thereby, and a preparation method of the catalyst. The method for simultaneously producing dimethyl carbonate and dimethyl ether through a urea alcoholysis process adopts a two-stage slurry bed reactor or fixed bed reactor technology, and in the preparation process, when dimethyl carbonate and dimethyl ether are prepared from methyl carbamate and methanol in a second-stage fixed bed reactor, a multi-component composite oxide catalyst using one or more of transition metal oxides, rare earth oxides, alkali metal oxides, alkaline earth oxides, IVA group metal oxides, VA group non-metal oxides or IIIA group non-metal oxides and Al2O3 as active components is filled into the fixed bed reactor, so the methyl carbamate conversion rate is improved, and the dimethyl carbonate and dimethyl ether selectivity is substantially improved.

Description

technical field [0001] The invention relates to a method for co-producing dimethyl carbonate and dimethyl ether by urea alcoholysis, a catalyst used in the method, and a preparation method of the catalyst. Background technique [0002] Dimethyl Carbonate (Dimethyl Carbonate, DMC for short, chemical formula: Its molecule contains CH 3 —, CH 3 O—, CH 3 O—CO—,—CO—multiple functional groups have good reactivity, and can undergo methylation, carbonylation, methyl esterification and transesterification reactions with various compounds such as alcohols, phenols, amines, hydrazines, and esters. Therefore, DMC can replace highly toxic reagents such as methylating reagents and carbonylating reagents (such as phosgene), and is widely used in organic synthesis industries such as polycarbonate preparation. DMC is a colorless, transparent, slightly odorous, slightly sweet liquid at room temperature. It is insoluble in water, but it can be miscible with almost all organic solvents suc...

Claims

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Application Information

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IPC IPC(8): B01J21/10B01J23/755B01J23/06B01J23/80B01J23/26B01J23/10B01J23/14B01J27/18B01J23/28B01J23/72C07C69/96C07C68/00C07C43/04C07C41/01
Inventor 吴鹏李志坚冯叶飞吴庆敏高滋
Owner YASHENTECH CORP
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