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Catalyst for preparing dimethyl ether from methanol

A technology for the preparation of methanol and dimethyl ether, applied in the direction of catalyst carrier, physical/chemical process catalyst, ether preparation, etc., to achieve high anti-sintering properties, high selectivity, and good stability

Active Publication Date: 2010-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the technical defects such as low catalyst activity, small processing capacity and short service life in the prior art, and a new methanol dehydration method is provided A catalyst for preparing dimethyl ether, which has the advantages of high activity, large processing capacity, high selectivity of dimethyl ether and good catalyst stability

Method used

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  • Catalyst for preparing dimethyl ether from methanol

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Experimental program
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Effect test

Embodiment 1

[0023] The niobium amine complex was dissolved in water to make a solution with a concentration of 0.12 g / ml, and 0.6% polyacrylamide (calculated as tetra-n-butoxy zirconium) was added at the same time. Add the above solution into tetra-n-butoxyzirconium, stir vigorously at 40°C for 30 minutes, then add the calculated amount of concentrated sulfuric acid into the above solution, continue vigorously stirring for 10 minutes, and then stand still at 60°C until a gel is formed. It was left at room temperature for 48 hours, aged at 80°C for 16 hours, dried at 120°C for 4 hours, and calcined at 600°C for 4 hours in an ammonia atmosphere to obtain catalyst B. The composition of the catalyst is shown in Table 1.

Embodiment 2

[0025] Mix 40% (weight concentration) silica sol and titanium sol, and stir evenly. Then quickly add niobium ethoxide liquid to the above solution, stir vigorously at 40°C for 30 minutes, then add the calculated amount of concentrated sulfuric acid into the above solution, continue vigorously stirring for 10 minutes, and then stand still at 60°C until a gel is formed . It was left at room temperature for 48 hours, aged at 80°C for 16 hours, dried at 120°C for 4 hours, and calcined in a carbon dioxide atmosphere at 500°C for 4 hours to obtain catalyst C. The composition of the catalyst is shown in Table 1.

Embodiment 3

[0027] The niobium oxalate solution was vacuum impregnated on HZSM-5 molecular sieve, and dried at 150°C for 2 hours. Then, the calculated amount of phosphoric acid solution was impregnated on the catalyst precursor, vacuum-dried at 120°C for 2 hours, and vacuum-calcined at 500°C for 4 hours to obtain catalyst E. The catalyst composition is shown in Table 1.

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Abstract

The present invention relates to a catalyst for preparing dimethyl ether by using methyl alcohol dehydration. Said catalyst is made up by using niobium oxide as main active component and selecting at least one kind of phosphorus or sulfur as adjuvant through a certain preparation process. Said catalyst not only has good activity, but also possesses good stability.

Description

technical field [0001] The invention relates to a catalyst for preparing dimethyl ether from methanol, in particular to a catalyst for preparing dimethyl ether by gas-phase dehydration of methanol. Background technique [0002] Dimethyl ether, also known as methyl ether, or DME for short. Dimethyl ether is a colorless, odorless, low-toxic, chemically stable, and water-soluble gas at room temperature. As an important chemical raw material, dimethyl ether can be used in the synthesis of many fine chemicals, such as pharmaceuticals, fuels, pesticides and other industries. Liquid DME has good solubility to polar and non-polar organic substances, so it is widely used in aerosol spray solvents, such as hairspray, mousse, air freshener, insecticide, spray paint, foaming agent, etc., and DME is also It can replace Freon as a low-toxic refrigerant, extractant and anesthetic. As a civil fuel, dimethyl ether has the advantages of sufficient combustion, no residual liquid, and no ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20B01J27/195B01J32/00C07C43/04C07C41/09
Inventor 李应成张惠明杨为民
Owner CHINA PETROLEUM & CHEM CORP
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