Method of recovering light hydrocarbon from byproduct gas of Fischer-Tropsch synthesis

A by-product gas and Fischer-Tropsch synthesis technology, applied in the chemical industry, can solve problems such as unrealized use value, achieve the effect of simplifying the composition and improving the product yield

Active Publication Date: 2014-03-12
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But even so, a large amount of CO, ethane and hydrogen in the tail gas are used as fuel gas, and propylene and butene are also used as liquefied gas products, and the use value of these components has not been realized

Method used

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  • Method of recovering light hydrocarbon from byproduct gas of Fischer-Tropsch synthesis
  • Method of recovering light hydrocarbon from byproduct gas of Fischer-Tropsch synthesis

Examples

Experimental program
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Effect test

Embodiment

[0051] 1. Fischer-Tropsch synthesis by-product gas treatment

[0052] A by-product gas processing unit U201 is provided to process the by-product gases 201 and 202 from the Fischer-Tropsch unit U101. This unit realizes the removal of N2 and CO in the by-product gas of Fischer-Tropsch synthesis, and separates the decarbonized gas between carbon one and carbon two, and separates it into carbon one material and carbon two stream. The carbon dioxide stream 305 is sent to the light hydrocarbon recovery unit after removing CO2 again through the scrubber installed in this unit. This unit also includes carbon-stream conversion and hydrogen purification.

[0053] The by-product gas of Fischer-Tropsch synthesis is firstly removed by solvent absorption and desorption process to within 1.5-3.0% of CO2, and the gas after decarbonization is roughly divided into carbon-1 stream and carbon-2 stream through adsorption and separation; among them, after decarburization 75-99% of the carbon one...

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Abstract

The invention discloses a method of recovering light hydrocarbon from byproduct gas of Fischer-Tropsch synthesis. The method includes exhaust gas treatment, light hydrocarbon recovery, olefin conversion and polyolefin synthesis. The exhaust gas treatment includes decarburization and crude separation of a C1 stream and a C2 stream. The light hydrocarbon recovery includes separating the C2 stream, cracking gas and a portion of mixed C4 to obtain a stream comprising ethane, ethylene, propane, propylene, the mixed C4 and light naphtha. The olefin conversion includes reacting C4 olefins with the ethylene to produce the propylene. The polyolefin synthesis includes subjecting the obtained ethylene and the obtained propylene to polymerization to obtain polyethylene and polypropylene. The method is capable of increasing the yield of effective products of Fischer-Tropsch synthetic products, increasing the product kinds, improving the added valve of the products and increasing benefit.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for recovering and utilizing light hydrocarbons from Fischer-Tropsch synthesis by-product gas. Background technique [0002] The Fischer-Tropsch synthesis process will use synthesis gas (CO+H2) produced by different raw materials and methods, and generate liquid hydrocarbon products through F-T (Fischer-Tropsch) synthesis reaction under the action of a catalyst. Through the Fischer-Tropsch (F-T) synthesis process, coal, natural gas, and oilfield associated gas can be liquefied to produce petroleum products such as naphtha, diesel oil, and kerosene. The F-T synthesis process produces a large amount of gas by-product while producing liquid oil, which is usually called Fischer-Tropsch synthesis tail gas. This part of the gas contains CO, CO2, H2 and light hydrocarbons with lower carbon numbers, such as methane, carbon two, carbon three (propylene and propane) and carbon fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F10/06C10G2/00
Inventor 刘家明李宁郭志雄戴文松
Owner CHINA PETROCHEMICAL CORP
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