Catalyst used for synthesized gas directly preparing dimethy ether

A technology for dimethyl ether and synthesis gas, applied in molecular sieve catalysts, physical/chemical process catalysts, ether preparation, etc., can solve the problems of low conversion rate of carbon monoxide to dimethyl ether, high catalyst reaction temperature, etc., and achieve good methanol synthesis Active and dehydrating activity, good dispersion, good stability

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that there are problems in the prior art that the catalyst reaction temperature is high, the conversion rate of carbon monoxide and / or the selectivity of dimethyl ether is not high, and a new catalyst for the direct preparation of dimethyl ether from synthesis gas is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve the required amount of copper nitrate, zinc nitrate, aluminum nitrate, and zirconium oxychloride in 120 ml of distilled water to form a solution; then add the required amount of H-ZSM-5 molecular sieve that has been dried and roasted to the above In the aqueous solution, stir evenly to form a suspension; finally, co-precipitate the suspension with sodium carbonate solution at 70°C, continue to stir and age for 1 hour (pH is always controlled at about 7.0), filter, wash, and dry at 120°C Calcined at 350° C. for 4 hours for 16 hours, pressed into tablets and crushed into 20-40 mesh particles to obtain catalyst A. Its composition and molecular sieve silicon-aluminum molar ratio are shown in Table-1, and its reaction performance is shown in Table-2.

Embodiment 2

[0025] The preparation process is the same as in Example 1, the catalyst number is B, its composition and molecular sieve silicon-aluminum molar ratio are shown in Table-1, and the reaction performance is shown in Table-2.

Embodiment 3

[0027] First dissolve the required amount of oxalic acid in 30 ml of absolute ethanol, and dissolve the required amount of copper nitrate, zinc nitrate, aluminum nitrate and zirconium nitrate in 120 ml of absolute ethanol; Add H-ZSM-5 into the ethanol solution of nitrate, and stir it evenly to form a suspension; then add the ethanol solution of oxalic acid into the suspension under rapid stirring to react and precipitate, continue to stir and age for 1 hour, and then filter the ethanol. Place it at room temperature for 2 hours, dry at 120°C for 16 hours, calcinate at 350°C for 4 hours, press into tablets and crush it, take 20-40 mesh particles to obtain catalyst C. Its composition and molecular sieve silicon-aluminum molar ratio are shown in Table-1, and its reaction performance is shown in Table-2.

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Abstract

The present invention relates to a catalyst for a syngas to directly prepare for dimethl ether and mainly solves the problems in the prior art that a reaction temperature of the catalyst is high; a carbon monoxide transformation rate and/or a selectivity of the dimethl ether are not high. The present invention solves the problem well by adopting a technical proposal that the catalyst comprises an oxide of cuprum, zinc, aluminium and zirconium and a ZSM-5 molecular sieve, which effectively translates the syngas into the dimethl ether by one step. The present invention can be used for the industrial production that the syngas directly prepares for the dimethl ether.

Description

technical field [0001] The invention relates to a catalyst for directly preparing dimethyl ether from synthesis gas. Background technique [0002] Dimethyl ether is an important raw material for the production of various chemical products, and has many unique uses in chemical industries such as pharmaceuticals, dyes, and pesticides; dimethyl ether has extremely good combustion performance and can achieve clean combustion, so it can be used as an urban A substitute for coal gas, liquefied petroleum gas and even diesel; DME can also replace Freon as a safe atomization propellant. It can be seen that dimethyl ether has a good market prospect and has attracted increasing attention internationally. [0003] The production of dimethyl ether mainly includes two processes of methanol dehydration and direct synthesis of synthesis gas, namely the so-called two-step process and one-step process. The two-step method is to convert syngas to methanol, and then dehydrate methanol in liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46C07C43/04C07C41/01
Inventor 宋庆英张斌杨为民
Owner CHINA PETROLEUM & CHEM CORP
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