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A method for converting Fischer-Tropsch synthesis tail gas into Fischer-Tropsch synthesis feed gas

A technology of Fischer-Tropsch synthesis and raw material gas, applied in chemical instruments and methods, inorganic chemistry, chemical industry, etc., can solve the problems of high purity control requirements, and achieve the effect of simple process, convenient operation and full utilization

Active Publication Date: 2016-04-13
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of this method is to reduce the load of the transformation process in the Fischer-Tropsch synthesis unit, thereby improving the production efficiency and economical efficiency of the Fischer-Tropsch synthesis unit, but in this method, the H 2 and CH 4 The purity control requirements are higher

Method used

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  • A method for converting Fischer-Tropsch synthesis tail gas into Fischer-Tropsch synthesis feed gas
  • A method for converting Fischer-Tropsch synthesis tail gas into Fischer-Tropsch synthesis feed gas
  • A method for converting Fischer-Tropsch synthesis tail gas into Fischer-Tropsch synthesis feed gas

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Experimental program
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Effect test

Embodiment 1

[0074] (1) 40°C, 2.4MPa, space velocity is 1500h -1 Fischer-Tropsch synthesis tail gas (its main components are 16.4% CO, 40.3% H 2 , 40.2%CH 4 , 1.2% low carbon hydrocarbons, 0.1% CO 2 , 1.83%N 2 ) is preheated to 200°C and enters the hydrogenation reactor 2, under the action of the catalyst JT-202 at 230°C, 2.4MPa, and a space velocity of 1500h -1 Under the conditions of hydrogenation reaction, C 2 h 4 and C 3 h 6 All converted to C 2 h 6 and C 3 h 8 , the gas after hydrogenation is mixed with saturated steam at 230°C and 2.4MPa according to the water-to-carbon ratio of 3.0, and then heated to 500°C to enter the primary reformer 4;

[0075] (2) The mixed gas entering the primary reformer 4 is in the presence of catalysts Z112-HA and Z112-HB at a weight ratio of 1:1, the operating temperature is 720°C, the pressure is 2.4MPa, and the space velocity is 1500h -1, and part of the heat provided by the high-temperature reformed gas from the secondary reformer 5 to the ...

Embodiment 2

[0079] (1) 40°C, 2.5MPa, space velocity is 1200h -1 Fischer-Tropsch synthesis tail gas (its main components are 16.4% CO, 40.3% H 2 , 40.2%CH 4 , 1.2% low carbon hydrocarbons, 0.1% CO 2 , 1.83%N 2 ) is preheated to 220°C and enters the hydrogenation reactor 2, under the action of the catalyst JT-202 at 220°C, 2.5MPa, and a space velocity of 1100h -1 Under the conditions of hydrogenation reaction, C 2 h 4 and C 3 h 6 All converted to C 2 h 6 and C 3 h 8 , the gas after hydrogenation is mixed with saturated steam at 230°C and 2.5MPa according to the water-to-carbon ratio of 2.9, and then heated to 500°C to enter the primary reformer 4;

[0080] (2) The mixed gas entering the primary reformer 4 is in the presence of catalysts Z112-HA and Z112-HB at a weight ratio of 0.9:1.1, the operating temperature is 740°C, the pressure is 2.5MPa, and the space velocity is 1100h -1 , and part of the heat provided by the high-temperature reformed gas from the secondary reformer 5 to...

Embodiment 3

[0083] (1) 40°C, 2.3MPa, space velocity 1000h -1 Fischer-Tropsch synthesis tail gas (its main components are 16.4% CO, 40.3% H 2 , 40.2%CH 4 , 1.2% low carbon hydrocarbons, 0.1% CO 2 , 1.83%N 2 ) is preheated to 240°C and enters the hydrogenation reactor 2, under the action of the catalyst JT-202 at 230°C, 2.3MPa, and a space velocity of 1200h -1 Under the conditions of hydrogenation reaction, C 2 h 4 and C 3 h 6 All converted to C 2 h 6 and C 3 h 8 , the gas after hydrogenation is mixed with saturated steam at 230°C and 2.3MPa according to the water-to-carbon ratio of 2.7, and then heated to 500°C to enter the primary reformer 4;

[0084] (2) The mixed gas entering the primary reformer 4 is in the presence of the catalyst Z112-HA and Z112-HB with a weight ratio of 0.8:1, the operating temperature is 800°C, the operating pressure is 2.3MPa, and the space velocity is 1200h -1 , and part of the heat provided by the high-temperature reformed gas from the secondary ref...

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Abstract

The invention relates to a method for converting a Fischer-Tropsch synthesis tail gas into a Fischer-Tropsch synthesis feed gas. The method comprises the following steps that: carrying out catalytic hydrogenation reaction on the Fischer-Tropsch synthesis tail gas in a hydrogenation reactor filled with a hydrogenation catalyst, so as to convert the Fischer-Tropsch synthesis tail gas into saturated hydrocarbon; then carrying out steam reforming and partial oxidation in a primary converter and a secondary converter, carrying out water gas shift reaction in an intermediate converter and finally carrying out gas-liquid separation, wherein a gas phase is the feed gas which meets the requirement for hydrogen carbon ratio required by Fischer-Tropsch synthesis. The method disclosed by the invention has the advantages of simple process and convenience for operation.

Description

technical field [0001] The invention relates to a method for converting Fischer-Tropsch synthesis tail gas into Fischer-Tropsch synthesis feed gas. Background technique [0002] Fischer-Tropsch synthesis tail gas refers to the synthetic gas (H 2 H 2 , CO, CO 2 And a mixed gas composed of low-carbon hydrocarbons. Among them, the low carbon hydrocarbons are represented by CH 4 Mainly, its content is usually 20-60% (mol percent), and in addition, low-carbon hydrocarbons also contain 1-10% (mol percent) of low-carbon olefins. In the currently disclosed prior art, there are mainly two ways to utilize Fischer-Tropsch synthesis tail gas. One is to obtain H through separation. 2 and methane gas, etc.; the other is to convert hydrocarbons (mainly methane) in the tail gas into synthesis gas, and then return it to the Fischer-Tropsch synthesis unit as raw material gas to further synthesize oil products, thereby improving the utilization rate of raw materials and the yield of oil p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/38
CPCY02P20/10
Inventor 孟凡会王东飞冯永发李忠裴建勋王伟林刘俊义章清
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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