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Catalyst for direct preparation of dimethyl ether by using synthesis gas

A technology of dimethyl ether and synthesis gas, which is applied in the dehydration of hydroxyl-containing compounds to prepare ether, molecular sieve catalysts, physical/chemical process catalysts, etc., and can solve the problems of high reaction temperature and low selectivity of carbon monoxide conversion to dimethyl ether

Active Publication Date: 2009-10-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] The technical problem to be solved by the present invention is the problems of high reaction temperature, carbon monoxide conversion rate and / or low selectivity of dimethyl ether in the prior art, and a new catalyst for the direct preparation of dimethyl ether from synthesis gas is provided

Method used

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  • Catalyst for direct preparation of dimethyl ether by using synthesis gas

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Comparison scheme
Effect test

Embodiment 1

[0047] Iron-containing HZSM-5 molecular sieves were prepared by hydrothermal synthesis. 1 gram of Fe(NO3) 3 9H 2 O is dissolved in distilled water and is made into 22 milliliters of aqueous solution A, adds 1.2 grams of sodium hydroxide in 24 grams of TPAOH aqueous solution (the weight content of TPAOH is 40%), then with 22 grams of silica sol (SiO 2 The weight content is 40%) and mixed evenly, as solution B. Slowly add solution A to solution B under stirring. After aging for half an hour, transfer to a high-pressure bomb and crystallize at 170°C for 2 days. The crystallized product was fired at 500°C in air for 4 hours to remove the templating agent. The resulting product was subjected to NH 4 NO 3 The solution was exchanged at 80° C. for 3 times for 1 hour each time, and then calcined at 550° C. in air for 4 hours to obtain Fe-ZSM-5 molecular sieve. The Fe-ZSM-5 obtained above is used as an acidic component, and is mechanically mixed with methanol synthesis components ...

Embodiment 2

[0049] Prepare Fe-ZSM-5 molecular sieve with embodiment 1, just Fe(NO3) 3 9H 2 O was added in an amount of 2 grams. Fe-ZSM-5 obtained in this way is an acidic component, which is mechanically mixed with methanol synthesis components to obtain bifunctional catalyst B, wherein the weight percentage of each component is CuO 40%, ZnO 25%, Al 2 o 3 4%, Fe-ZSM-5 31%, SiO in Molecular Sieve 2 / Fe 2 o 3 The molar ratio was 30.

Embodiment 3

[0051] Prepare the ZSM-5 molecular sieve containing Fe with embodiment 1, just add the Al of 0.8 gram simultaneously in solution A (NO3) 3 9H 2 O. The Fe-Al-ZSM-5 obtained above is used as an acidic component, and is mechanically mixed with methanol synthesis components to obtain a bifunctional catalyst C, wherein the weight percentage of each component is CuO 35%, ZnO 15%, Al 2 o 3 3%, Fe-Al-ZSM-5 47%, SiO in Molecular Sieve 2 / Al 2 o 3 The molar ratio is 60, SiO 2 / Fe 2 o 3 The molar ratio was 60.

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Abstract

The invention relates to a catalyst for directly preparing dimethyl ether from synthesis gas, which mainly solves the problems of high reaction temperature, low conversion rate of carbon monoxide and / or low selectivity of dimethyl ether in the prior art. The present invention uses CuO-ZnO-Fe2O3-molecular sieves as components, wherein the molecular sieves are selected from ZSM-5, ZSM-11, ZSM-48, MCM-22, MCM-49 or MCM-56, β, Y or mordenite At least one of the technical schemes solves this problem well, and can be used in the industrial production of direct preparation of dimethyl ether from synthesis gas.

Description

technical field [0001] The invention relates to a catalyst for directly preparing dimethyl ether from synthesis gas. Background technique [0002] Due to its unique physical and chemical properties, dimethyl ether is mainly used as a propellant for aerosols. In addition, dimethyl ether can also be used as a chemical raw material for the synthesis of dimethyl ether sulfate, etc., replacing diesel as clean vehicle fuel and liquefied gas as civil fuel. The construction of ether production facilities has been put on the agenda, and its development prospect of replacing diesel or liquefied gas is generally optimistic. [0003] DME was first produced by distillation of by-products in high-pressure methanol production. With the wide application of low-pressure methanol synthesis technology, the side reactions are greatly reduced, and the industrial production technology of dimethyl ether has quickly developed into methanol dehydration or direct synthesis of synthesis gas, which i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/06C07C41/09C07C43/04
Inventor 毛东森夏建超张斌
Owner CHINA PETROLEUM & CHEM CORP