High-activity catalyst for synthesizing dimethyl carbonate, and preparation method and application thereof

A technology of dimethyl carbonate and catalyst, which is applied in the field of high-activity dimethyl carbonate production catalyst and its preparation and application, can solve the problems of difficult separation of homogeneous catalysts and low equilibrium conversion rate, and achieve easy recovery, separation and preparation The method is simple and the effect is good

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of low equilibrium conversion rate and difficult separation of homogeneous catalysts in the existing technology of urea and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] (1) Preparation of ZSM-5 molecular sieve. Prepare 100 ml of aqueous solution containing 90 grams of water glass, add 30 ml of aqueous solution containing 13 grams of aluminum sulfate therein, and vigorously stir. At the same time, 16 grams of tetrapropylammonium bromide was added as a template agent, and the pH value was adjusted to 10 with dilute sulfuric acid. Stirring was continued until a jelly-like substance was obtained, and the resulting jelly-like substance was transferred into an autoclave and kept at 140° C. for 40 hours. After the crystallization is completed, the obtained product is washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / aluminum ratio of 50, and a hydrogen-form ZSM-5 molecular sieve is obtained after ammonium exchange.

[0025] (2) To modify the hydrogen ZSM-5, use Mg(NO 3 ) 2 Aqueous solution can impregnate and modify ZSM-5. Take 8gMg(NO 3 ) 2 Prepare 60ml of aqueous solution, add 65g of ZSM-5 to it, stir evenly, soak fo...

example 2

[0029] (1) Preparation of ZSM-5 molecular sieve. Prepare 120ml of aqueous solution containing 95 grams of water glass, add 30ml of aqueous solution containing 12 grams of aluminum sulfate therein, and vigorously stir. At the same time, 18 g of tetrapropylammonium bromide was added as a template, and the pH value was adjusted to 11 with dilute sulfuric acid. Stirring was continued until a jelly-like substance was obtained, and the resulting jelly-like substance was transferred into an autoclave and kept at 150° C. for 30 hours. After the crystallization is completed, the obtained product is washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / aluminum ratio of 80, and a hydrogen-type ZSM-5 molecular sieve is obtained after ammonium exchange.

[0030] (2) To modify the hydrogen ZSM-5, use Mg(NO 3 ) 2 Aqueous solution can impregnate and modify ZSM-5. Take 20gMg(NO 3 ) 2 Prepare 110ml of aqueous solution, add 85 grams of ZSM-5 to it, stir evenly, soak for 6 h...

example 3

[0034] (1) Preparation of ZSM-5 molecular sieve. Prepare 90 ml of aqueous solution containing 75 grams of water glass, add 50 ml of aqueous solution containing 23 grams of aluminum sulfate therein, and vigorously stir. At the same time, 16 g of tetrapropylammonium bromide was added as a template agent, and the pH value was adjusted to 11 with dilute sulfuric acid. Stirring was continued until a jelly-like substance was obtained, and the resulting jelly-like substance was transferred into an autoclave and kept at 150°C for 25 hours. After the crystallization is completed, the obtained product is washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / aluminum ratio of 30, and a hydrogen-form ZSM-5 molecular sieve is obtained after ammonium exchange.

[0035] (2) To modify the hydrogen ZSM-5, use Mg(NO 3 ) 2 Aqueous solution can impregnate and modify ZSM-5. Take 13gMg(NO 3 ) 2 Prepare 90ml of aqueous solution, add 65g of ZSM-5 to it, stir evenly, soak for 5 hour...

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Abstract

The invention discloses a supported catalyst for preparing dimethyl carbonate with urea and methanol. The catalyst is prepared from the following components by weight: 40%-75% of an alkaline earth metal modified MFI molecular sieve, 15%-30% of active metal oxide, and 10%-20% of phosphorus pentoxide; in the alkaline earth metal modified MFI molecular sieve, the weight of an alkaline earth metal accounts for 0.3-2% of the weight of the MFI molecular sieve; the MFI molecular sieve is a ZSM-5 molecular sieve preferably; the alkaline earth metal comprises beryllium, magnesium, calcium, strontium, barium or radium, and preferably magnesium or calcium; the active metal oxide is zinc oxide and/or cerium oxide. The catalyst can overcome the defects in the prior art that the equilibrium conversion rate is low and a homogeneous catalyst is not easy to separate in the technology of adopting urea and methanol to prepare dimethyl carbonate; the yield of dimethyl carbonate is high.

Description

technical field [0001] The invention relates to a catalyst for synthesizing dimethyl carbonate and its preparation method and application, in particular to a catalyst for producing dimethyl carbonate from urea and methanol, its preparation method and application. Background technique [0002] Dimethyl carbonate (DMC) is an environmentally friendly organic chemical raw material that meets the requirements of modern "clean technology", and is one of the green chemical products unanimously recognized by the international community. It can not only replace phosgene, dimethyl sulfate, methyl chloride and methyl chloroformate as reagents for carbonylation, methylation, esterification and transesterification, but also be a good green solvent and gasoline additive. [0003] Catalytic synthesis of dimethyl carbonate (DMC) by alcoholysis of methanol and urea is a novel process route to replace phosgene to produce DMC. The urea alcoholysis method uses urea and methanol as the basic ra...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C69/96C07C68/00
Inventor 孙潇磊张志智尹泽群刘全杰张喜文
Owner CHINA PETROLEUM & CHEM CORP
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