Fischer-Tropsch synthesis method

Abstract

The invention relates to a Fischer-Tropsch synthesis method, which comprises that: hydrogen and carbon monoxide contact with each other under the condition of Fischer-Tropsch synthesis and in the presence of a Fischer-Tropsch synthesis catalyst, wherein the Fischer-Tropsch synthesis catalyst comprises a first Fischer-Tropsch synthesis catalyst and a second Fischer-Tropsch synthesis catalyst; the pore volume of the first Fischer-Tropsch synthesis catalyst is less than that of the second Fischer-Tropsch synthesis catalyst; and the hydrogen and the carbon monoxide contact with the first Fischer-Tropsch synthesis catalyst first and then contact with the second Fischer-Tropsch synthesis catalyst. By making the hydrogen and the carbon monoxide contact with the first Fischer-Tropsch synthesis catalyst with small pore volume first and then contact with the second Fischer-Tropsch synthesis catalyst with large pore volume, the method can give full play to the catalysis of the catalyst, reduce the selectivity of CH4 products, improve the selectivity of a Fischer-Tropsch synthesis liquid C5+ hydrocarbon, and simultaneously improve the conversion rate of raw materials CO.

Description

technical field [0001] The present invention relates to a Fischer-Tropsch synthesis method. Background technique [0002] Using natural gas, asphalt, coal, biomass and other hydrocarbon-containing resources as raw materials to produce synthesis gas, and then using synthesis gas as raw material to produce liquid hydrocarbons through Fischer-Tropsch synthesis is a good oil replacement technology. Fischer-Tropsch synthesis (Fischer-Tropsch synthesis) is a process of synthesizing paraffin-based liquid fuels with synthetic gas as raw materials under catalysts (mainly iron) and appropriate reaction conditions. Developed by German chemists F. Fischer and H. Tropsch in 1923, it was put into mass production during World War II. The reaction process can be represented by the following formula: [0003] nCO+2nH 2 →[CH 2 ] n +nH 2 O [0004] However, the traditional Fischer-Tropsch synthesis method uses cobalt as a catalyst, and the obtained product has complex composition, poor ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome Fischer-Tropsch synthesis reaction C in the prior art 5 + Insufficient selectivity of hydrocarbons and CH 4 The disadvantages of high selectivity and low CO conversion rate provide a C 5 + High hydrocarbon selectivity and CH 4 Fischer-Tropsch synthesis with low selectivity and high CO conversion

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