Method for preparing low-carbon olefin by taking biomass synthetic gas as raw material with dimethyl ether two-step method

A technology for low-carbon olefins and dimethyl ether, which is applied in the field of preparing low-carbon olefins and achieves the effects of short regeneration cycle, improved selectivity and wide sources

Inactive Publication Date: 2012-06-27
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the method of combining the technology of biogas synthesis of dimethyl ether and the two-step process of converting dimethyl ether into light olefins.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A: In the fixed bed reactor, the dimethyl ether synthesis catalyst first passes through the space velocity of 1800 -1 , V(H at a pressure of 0.5MPa 2 ) / V(N 2 )=5 / 95 reducing gas is heated to 270°C by program, and then reduced at 270°C for 10 hours;

[0028] The composite catalyst Cu / Zn / Al / HZSM-5 composed of methanol synthesis catalyst and dehydration catalyst of the dimethyl ether synthesis catalyst, the mass ratio of each component Cu: Zn: Al: HZSM-5=50: 26: 4: 20 ;

[0029] B: In the two-stage fixed-bed reactor, the dimethyl ether conversion catalyst is first 2 Gradually raise the temperature to 450°C under the atmosphere, and activate at the reaction temperature for 3 hours;

[0030] The preparation method of the dimethyl ether conversion catalyst is: impregnating the SAPO-34 molecular sieve with the ethanol solution of nickel nitrate, drying at 100°C, calcining at 550°C for 3 hours, and mechanically mixing with HZSM-5 to obtain the conversion catalyst. Wherein ...

Embodiment 2

[0034] A: In a one-step fixed-bed reactor, the dimethyl ether synthesis catalyst first passes through a space velocity of 1500 -1 , V(H at a pressure of 0.8MPa 2 ) / V(N 2 )=5 / 95 reducing gas is heated to 270°C by program, and then reduced at 270°C for 10 hours;

[0035] The composite catalyst Cu / Zn / Al / HZSM-5 composed of methanol synthesis catalyst and dehydration catalyst of the dimethyl ether synthesis catalyst, the mass ratio of each component Cu: Zn: Al: HZSM-5=34: 18: 2.4: 46 ;

[0036] B: In the two-stage fixed-bed reactor, the dimethyl ether conversion catalyst is first 2 Gradually raise the temperature to 450°C under the atmosphere, and activate at the reaction temperature for 3 hours;

[0037] The preparation method of the dimethyl ether conversion catalyst is: impregnating the SAPO-34 molecular sieve with the ethanol solution of nickel nitrate, drying at 100°C, calcining at 550°C for 3 hours, and mechanically mixing with HZSM-5 to obtain the conversion catalyst. W...

Embodiment 3

[0041] A: In a one-step fixed-bed reactor, the dimethyl ether synthesis catalyst first passes through a space velocity of 2000 -1 , V(H at a pressure of 0.6MPa 2 ) / V(N 2 )=5 / 95 reducing gas is heated to 270°C by program, and then reduced at 270°C for 10 hours;

[0042] The composite catalyst Cu / Zn / Al / HZSM-5 composed of methanol synthesis catalyst and dehydration catalyst of the dimethyl ether synthesis catalyst, the mass ratio of each component Cu: Zn: Al: HZSM-5=34: 17: 2.4: 46

[0043] B: In the two-stage fixed-bed reactor, the dimethyl ether conversion catalyst is first 2 Gradually raise the temperature to 450°C under the atmosphere, and activate at the reaction temperature for 3 hours;

[0044] The preparation method of the dimethyl ether conversion catalyst is: impregnating the SAPO-34 molecular sieve with the ethanol solution of nickel nitrate, drying at 100°C, calcining at 550°C for 3 hours, and mechanically mixing with HZSM-5 to obtain the conversion catalyst. Wher...

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Abstract

The invention provides a method for preparing low-carbon olefin by taking biomass synthetic gas as a raw material with a dimethyl ether two-step method, comprising the following steps of: taking the biomass synthetic gas with a low hydrogen-carbon ratio as the raw material and carrying out methanol synthesis and methanol dehydration reactions on the raw material and a dimethyl ether synthesis catalyst in a one-step fixed bed reactor to prepare an oxygen-containing hydrocarbon with higher dimethyl ether content; after dehydrating a reaction product, raising the temperature to 120 DEG C and introducing the product into a two-step fixed bed reactor to be continuously reacted with a dimethyl ether catalytic conversion catalyst under normal pressure, so as to generate the low-carbon olefin, wherein the dimethyl ether synthetic catalyst is a compound catalyst composed of a Cu/Zn/Al methanol synthesis catalyst and an HZSM-5 (Hydro Zeolite Socony Mobil-5) methanol dehydration catalyst; a carrier of the dimethyl ether catalytic conversion catalyst is an SAPO-34 (Silicoaluminophosphate-34) and HZSM-5 mechanically-mixing molecular sieve; an active component is nickel and a weight loading amount is 0.5-1.5 percent. The CO conversion rate of the method provided by the invention can reach to 39.2-77.4 percent, the selectivity of the low-carbon olefin can reach to 71.5-84.6 percent and the carbon utilization rate of the synthetic gas can reach to 10.2-32.8 percent. The invention provides a new technical route for the production of the low-carbon olefin in our country.

Description

technical field [0001] The invention provides a method for preparing low-carbon olefins through an indirect synthesis gas method, in particular to a method for preparing low-carbon olefins with low-hydrogen-to-carbon ratio biomass synthesis gas as a raw material and dimethyl ether as an intermediate product. technical background [0002] At present, the vast majority of ethylene comes from naphtha steam cracking technology, which consumes a lot of energy and is completely dependent on petroleum resources. The development of natural gas, coal or biomass as raw materials, synthesis gas, and methanol or dimethyl ether (indirect method) as intermediate products to produce low-carbon olefins is a hot research topic at present, and it is also the most promising process to replace the petroleum route. In the process of preparing low-carbon olefins by the indirect method, there are relatively mature technologies for preparing synthesis gas, methanol or dimethyl ether from coal, natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06C07C11/02
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 李宇萍王铁军马隆龙吴创之张雪定明月
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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