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A method for directly preparing dimethyl ether from synthesis gas

A synthesis gas and dimethyl ether technology, which is applied in the dehydration of hydroxyl compounds to prepare ethers, hydroxyl compounds, and organic compounds, can solve the problems of poor stability of composite catalysts and the lack of industrialization of dimethyl ether technology. Achieve the effects of inhibiting the water gas shift reaction, good catalyst stability, and reducing a large amount of energy consumption

Active Publication Date: 2022-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under high-temperature reaction conditions, the stability of the composite catalyst becomes poor, and CuZnAlO x Can not be regenerated, these factors have led to the fact that the technology of producing dimethyl ether directly from syngas has not been industrialized so far

Method used

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  • A method for directly preparing dimethyl ether from synthesis gas
  • A method for directly preparing dimethyl ether from synthesis gas
  • A method for directly preparing dimethyl ether from synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 95g Zn(NO 3 ) 2 6H 2 O and 80g Al(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to prepare a saline solution. Dissolve 25g of ammonium carbonate in 200ml of deionized water to prepare an alkaline solution. Use two peristaltic pumps to mix and co-precipitate the salt solution and alkali solution respectively. The temperature of the precipitation reaction is controlled at 60°C, the pH value is 7.2, and it is aged at this temperature for 4 hours. Calcined for 4 hours to obtain zinc-aluminum spinel oxide, coded as A. X-ray fluorescence spectroscopic analysis (XRF) shows that Zn / Al (molar ratio)=1: 1 in A, XRD figure is as follows figure 1 As shown, the TEM image is shown in figure 2 shown.

Embodiment 2

[0060] 48g Zn(NO 3 ) 2 6H 2 O and 80g Al(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to prepare a saline solution. 25g ammonia water (containing 25% NH 3 ) was dissolved in 200ml deionized water to prepare an alkaline solution. Use two peristaltic pumps to mix and co-precipitate the salt solution and alkali solution respectively. The temperature of the precipitation reaction is controlled at 70°C, the pH value is 7.5, and it is aged at this temperature for 6 hours. After filtering and washing, dry at 100°C for 24 hours, Calcined for 4 hours to obtain zinc-aluminum spinel oxide, coded as B. XRF showed that Zn / Al (molar ratio) in B=1:2.

Embodiment 3

[0062] 10.6g Zn(NO 3 ) 2 6H 2 O and 80g Al(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to prepare a saline solution. Dissolve 25g of sodium carbonate in 200ml of deionized water to prepare an alkaline solution. Use two peristaltic pumps to mix and co-precipitate the salt solution and the alkali solution respectively. The temperature of the precipitation reaction is controlled at 80°C, the pH value is 7.8, and it is aged at this temperature for 6 hours. Calcined for 6 hours to obtain zinc-aluminum spinel oxide, coded as C. XRF showed that Zn / Al (molar ratio) in C=1:9.

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Abstract

The invention discloses a method for directly preparing dimethyl ether from synthesis gas. The method comprises: passing synthesis gas through a reaction zone loaded with a catalyst, and reacting under reaction conditions sufficient to convert at least part of raw materials to obtain dimethyl ether containing a reaction effluent; and separating the dimethyl ether from the reaction effluent, wherein the catalyst is zinc aluminum spinel oxide. In the invention, only one zinc-aluminum spinel oxide catalyst is used, which can make the synthetic gas generate dimethyl ether with high selectivity, the catalyst has good stability, and the catalyst can be regenerated. The method of the invention realizes the one-step generation of dimethyl ether from the synthesis gas, and reduces the problem of a large amount of energy consumption caused by the step-by-step production.

Description

technical field [0001] The invention relates to a method for directly preparing dimethyl ether from synthesis gas. Background technique [0002] Dimethyl ether (CH 3 OCH 3 , DME) is a non-toxic, harmless and non-corrosive chemical. Due to the advantages of high cetane number, no nitrogen and sulfur, and good miscibility with diesel, DME is a very potential clean diesel additive. The physical and chemical properties of dimethyl ether and liquefied petroleum gas are very close, and it has a broad application space in the field of household fuel. In recent years, the "coal-to-ethanol" technology has been a research hotspot in the field of "coal chemical industry". In the future, it will be widely used in synthetic fuel ethanol technology. At present, DME is mainly produced industrially through the dehydration reaction of methanol over a solid acid catalyst. We know that methanol is mainly composed of syngas in copper-zinc-aluminum (CuZnAlO x ) on methanol synthesis catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/09C07C43/04
CPCC07C41/09C07C29/153C07C29/1512B01J35/70B01J2235/30B01J2235/15B01J2235/00C07C43/043C07C31/04Y02P20/584C07C41/01B01J21/04B01J23/06B01J23/005B01J37/033B01J37/088B01J2523/00B01J23/26B01J37/0201B01J2523/27B01J2523/31B01J2523/67B01J2523/48B01J8/06B01J21/02B01J37/0063B01J37/009B01J37/0213B01J37/04B01J37/06B01J37/082
Inventor 倪友明朱文良刘中民刘勇刘红超马现刚刘世平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI