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Catalyst for synthesis of dimethyl ether with synthesis gas one-step method, production method and uses thereof

A catalyst, a technology for dimethyl ether, which is applied to the catalyst for synthesizing dimethyl ether by one-step synthesis gas and the field of preparation thereof, can solve the problems of unsatisfactory carbon dioxide selectivity and the like, and achieve the effects of low carbon dioxide selectivity, high melting point and preventing sintering

Active Publication Date: 2009-04-08
HAO HUA CHENGDU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a catalyst capable of high temperature resistance, so as to solve the problem of unsatisfactory yield and carbon dioxide selectivity of dimethyl ether under high temperature conditions existing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 16.57gZn(NO 3 ) 2 ·6H 2 O, 62.5g Al(NO 3 ) 3 9H 2 O and 31.8gMg(NO 3 ) 2 ·6H 2 O was made into 537.5ml mixed salt solution, co-precipitated with 0.4mol / L sodium carbonate solution at 65°C-70°C, controlled the pH value of the reaction solution to 7.0-7.5, and aged 1 to make phase A. 149.83gCu(NO 3 ) 2 ·3H 2 O and 45.5gZn(NO 3 ) 2 ·6H 2 O was made into 1000ml mixed salt solution, co-precipitated with 0.4mol / L sodium carbonate solution under the condition of 75℃~80℃, and the pH value of the reaction solution was controlled to be 7.0~7.5 to prepare phase B. Stir and mix the two phases A and B evenly, age for 1h, add γ-Al 2 o 3 Stir evenly, the added γ-Al 2 o 3 The mass ratio to CuO is γ-Al 2 o 3 / CuO=1.75 / 1, filtered, washed with deionized water to obtain a solid, dried at 100°C for 16 hours, calcined at 350°C for 4 hours, and pressed into tablets to obtain the catalyst cat-a. Catalyst cat-a is used to synthesize dimethyl ether in a fixed bed of syngas, ...

Embodiment 2

[0019] 16.57gZn(NO 3 ) 2 ·6H 2 O, 57.9g Al(NO 3 ) 3 9H 2 O and 20.9gMg(NO 3 ) 2 ·6H 2 O was made into 537.5ml mixed salt solution, co-precipitated with 1.0mol / L sodium carbonate solution at 65°C-70°C, controlled the pH of the reaction solution to 7.0-7.5, and aged for 2 hours to make phase A. 45.5gZn(NO 3 ) 2 ·6H 2 O and 131.5g Cu(NO 3 ) 2 ·3H 2 O was made into 1000ml mixed salt solution, co-precipitated with 1.0mol / L sodium carbonate solution at 75°C-80°C, and controlled the pH value of the reaction solution to be 7.0-7.5 to prepare phase B. Stir and mix the two phases A and B evenly, add γ-Al after aging for 2 hours 2 o 3 , stir evenly, the added γ-Al 2 o 3 The mass ratio to CuO is γ-Al 2 o 3 / CuO=1.75 / 1, filtered, washed with deionized water to obtain a solid, dried at 100°C for 16 hours, calcined at 380°C for 4 hours, and pressed into tablets to obtain the catalyst cat-b. Use this catalyst to synthesize dimethyl ether in a fixed bed of synthesis gas, an...

Embodiment 3

[0021] 16.57gZn(NO 3 ) 2 ·6H 2 O, 57.9g Al(NO 3 ) 3 9H 2 O and 20.9gMg(NO 3 ) 2 ·6H 2 O was made into 537.5ml mixed salt solution, co-precipitated with 0.6mol / L potassium carbonate solution at 65°C-70°C, controlled the pH value of the reaction solution to 7.0-7.5, and aged for 1.5h to make phase A. 45.5gZn(NO3 ) 2 ·6H 2 O and 131.5g Cu(NO 3 ) 2 ·3H 2 O was made into 1000ml mixed salt solution, co-precipitated with 0.6mol / L potassium carbonate solution under the condition of 75℃~80℃, and the pH value of the reaction solution was controlled to be 7.0~7.5 to prepare phase B. Stir and mix the two phases A and B evenly, add γ-Al after aging for 1.5h 2 o 3 , stir evenly, the added γ-Al 2 o 3 The mass ratio of CuO to the catalyst is γ-Al 2 o 3 / CuO=1.8 / 1, filtered, washed with deionized water to obtain a solid, dried at 100°C for 16 hours, calcined at 360°C for 3.5 hours, and pressed into tablets to obtain the catalyst cat-c. Use this catalyst to synthesize dimethy...

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Abstract

The invention discloses a catalyst for one-step synthesis of dimethyl ether by synthesis gas for synthesis and a method for preparing the same, which belong to the technical field of catalyst. The general formula of the catalyst is CuZnAlMg(O)-gamma-Al2O3, wherein in the CuZnAlMg(O), Cu / Zn / Al is equal to (58 to 62) / (26 to 21) / (16 to 17), Mg / Cu is equal to between 1 / 10 and 1 / 5, and gamma-Al2O3 / CuO (mass ratio) is equal to between 1.7 / 1 and 2 / 1. The catalyst can be prepared by a method of two-step coprecipitation and deposition. Compared with the same catalyst without an auxiliary agent, the catalyst in the invention has higher dimethyl ether yield and lower carbon dioxide selectivity under high temperature condition.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for synthesizing dimethyl ether by one-step synthesis gas and a preparation method thereof. Background technique [0002] Dimethyl ether is widely used as aerosol propellant, solvent, refrigerant, boron trifluoride complexing agent, etc. At the same time, dimethyl ether has many unique uses in pharmaceutical, dyestuff, pesticide and daily chemical industries. As a fuel, dimethyl ether has the advantages of sufficient combustion, no residual liquid, and no carbon precipitation. Therefore, dimethyl ether can also be used as a new type of clean energy that can replace petroleum. At this stage, domestic and foreign are studying the use of dimethyl ether directly Used as vehicle fuel or as city gas. [0003] The key to the industrial synthesis of DME is to select an efficient catalyst. Since the 1990s in my country, there have been some patent literature repor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C07C43/04C07C41/01
Inventor 王莉李扬艾珍吴砚会
Owner HAO HUA CHENGDU TECH
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