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Method for preparing dimethyl ether

A technology of dimethyl ether and methanol, which is applied in the field of methanol gas-phase dehydration to prepare dimethyl ether, can solve the problems of high reaction temperature, small catalyst capacity, short service life, etc., and achieve high selectivity, excellent reaction performance, and good stability Effect

Active Publication Date: 2008-03-26
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 high reaction temperature existing in the prior art, the catalyst processing capacity is small, the technical defect such as short service life, provide a kind of new preparation method of dimethyl ether, this method has low reaction temperature, catalyst treatment The advantages of large amount, high dimethyl ether selectivity and good catalyst stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Fully mix 100 grams of aluminum hydroxide powder and 5 grams of asparagus powder, then add 50 milliliters of 4% (weight) dilute nitric acid, fully knead in a kneader to form a lump material, extrude into strips, and dry at room temperature For 24 hours, dry at 80°C for 2 hours, dry at 150°C for 2 hours, and bake at 1200°C for 4 hours to obtain strip-shaped α-Al 2 o 3 carrier. Dissolve commercially available niobic acid in oxalic acid to make a solution. This solution is impregnated in the prepared α-Al 2 o 3 On the carrier, dry at 120°C for 2 hours. The calculated amount of sulfuric acid solution was impregnated on the prepared catalyst precursor, dried at 120°C for 2 hours, and calcined in air at 400°C for 4 hours to obtain catalyst A. The catalyst composition is shown in Table 1.

Embodiment 2

[0027] 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 3

[0029] 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.

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Abstract

The present invention relates to process of preparing dimethyl ether, and aims at providing technological scheme of preparing dimethyl ether in lowered reaction temperature, high catalyst efficiency, long service life of catalyst and other merits. The process of preparing dimethyl ether adopts methanol as main material and catalyst with niobium oxide as the main active component and P and / or S as the co-catalyst, and has reaction temperature of 100-350 deg.c and catalyst efficiency of 1-20 ml methanol / hr.g. The present invention may be applied in industrial production of dimethyl ether.

Description

technical field [0001] The invention relates to a method for preparing dimethyl ether, in particular to a method 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 carbon precipitation....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09B01J23/20B01J27/195B01J32/00
Inventor 李应成何文军何立费泰康
Owner CHINA PETROLEUM & CHEM CORP
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