Method for processing Fischer-Tropsch synthesis tail gas

A Fischer-Tropsch synthesis and tail gas treatment technology, which is applied in separation methods, chemical instruments and methods, and air quality improvement, etc., can solve the problems of high energy consumption, complex process flow, and various product types, and achieves increased added value and economic benefits. optimal effect

Active Publication Date: 2012-08-01
SYNEFUELS CHINA
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Problems solved by technology

The process is complex and consumes a lot of ene

Method used

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  • Method for processing Fischer-Tropsch synthesis tail gas
  • Method for processing Fischer-Tropsch synthesis tail gas
  • Method for processing Fischer-Tropsch synthesis tail gas

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Embodiment 1

[0035] according to figure 1 The flow process one in is taken as an example, and embodiment 1 is given. The tail gas (stream 101) from the Fischer-Tropsch synthesis unit is passed through the decarburization unit, and the CO is removed by the hot potash method. 2 Components; a part of the decarbonized tail gas (stream 102) goes to the membrane separation unit to recover hydrogen, and the membrane separation unit uses two-stage membrane separation. One H 2 The gas at the / CO ratio is returned to the Fischer-Tropsch synthesis unit as recycle gas (stream 109), the primary membrane separation permeate gas goes to the secondary membrane separation, the secondary membrane separation permeate gas (stream 104) goes to the PSA unit for hydrogen production, and the non-permeate gas ( Stream 103) goes to the low-temperature oil washing unit to recover the liquefied gas component; the low-temperature oil washing unit recovers the liquefied gas component in the membrane separation non-p...

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Abstract

The invention relates to a method for processing Fischer-Tropsch synthesis tail gas, which comprises the steps of decarburization, membrane separation, low temperature oil washing, tail gas conversion and pressure swing adsorption(PSA). The method is characterized in that tail gas from a Fischer-Tropsch synthesis apparatus is passed through a decarburization unit for removing CO2 component; decarburization tail gas is sent to a membrane separation unit for recovering hydrogen, membrane separation penetration gas with rich hydrogen is boosted and then sent to a PSA unit for hydrogen production, also can be returned to the Fischer-Tropsch synthesis apparatus after boosting, the membrane separation unit can be returned to the Fischer-Tropsch synthesis apparatus according to the required gas with any H2/CO proportion, membrane separation non-penetration gas can be passed through a low temperature oil washing unit for recovering liquefied gas component and then sending to a tail gas conversion unit, and also can be sent to the tail gas conversion unit directly for hydrogen production; in the tail gas conversion unit, oil washing dry gas or membrane separation non-penetration gas are conversed, methane and hydrocarbons components are conversed to crude synthetic gas; the conversed crude synthetic gas converses CO and H2O to CO2 and H2, the conversed gas after decarburization removes CO2 to obtain hydrogen rich gas, the hydrogen rich gas is passed through the PSA unit for recovering hydrogen, hydrogen in the PSA unit can be used for whole plant, the analytic gas can be used as fuel gas.

Description

technical field [0001] The invention relates to a treatment method of Fischer-Tropsch synthesis tail gas, that is, a method for treating the Fischer-Tropsch synthesis tail gas produced in the indirect liquefaction process of coal gasification and then producing liquid fuel through Fischer-Tropsch synthesis. The process method after the optimization and integration of the five process steps of decarbonization unit, membrane separation unit, low temperature oil washing unit, tail gas conversion unit and PSA unit. Background technique [0002] China is rich in coal resources, but relatively deficient in oil and natural gas resources. Large-scale conversion of coal into liquid fuels through efficient and clean processes will effectively alleviate the tight supply of oil products and promote sustained and stable economic development. Coal-to-liquids technology can be divided into indirect coal liquefaction technology and coal direct liquefaction technology. Coal indirect liquefa...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/72B01D53/62
CPCY02C10/04Y02A50/20Y02C20/40
Inventor 李永旺张立董立华白亮郝栩
Owner SYNEFUELS CHINA
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