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Combined synthetic method for liquid hydrocarbon

A liquid hydrocarbon, combined technology, applied in the field of two-stage Fischer-Tropsch synthesis, can solve the problems of difficult reaction heat release, low CO utilization rate, high catalyst deactivation rate, and achieve strong anti-sulfur poisoning performance, water-gas shift Powerful, high-yield effects

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] The purpose of the present invention is to provide a combined Fischer-Tropsch synthesis process, which can solve the disadvantages of low CO utilization rate, difficult control of reaction heat release, high catalyst deactivation rate and other shortcomings in conventional processes, while improving reaction selectivity and liquid hydrocarbon synthesis. yield

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Embodiment

[0043] In this embodiment, the Fischer-Tropsch synthesis reaction is carried out by using the process and equipment shown in the accompanying drawings. The slurry bed reactor adopts the slurry external circulation separation form. There are 300 reaction tubes in the tubular fixed bed synthesis reactor. The reaction tubes are made of austenitic stainless steel pipes with an outer diameter of 38 mm and a wall thickness of 3 mm. The outer surface is cold-processed to form a groove structure. Each meter of tube length contains 500 grooves. , the groove depth is 1.2mm, the average groove width is 0.6mm, and the helix angle is 4°.

[0044] The first stage reactor adopts iron-based Fischer-Tropsch synthesis catalyst, which is prepared by precipitation method, and the main components are Fe, Cu, alkaline earth metals, K and SiO 2 , the catalyst weight composition is 100Fe:5Cu:5K:25SiO 2 . The preparation process of the catalyst used is as follows: mix a certain proportion of ferric...

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Abstract

The invention provides a combined synthetic method for liquid hydrocarbon. According to the method, a purified raw material--synthetic gas enters a first-stage Fischer-Tropsch synthesis reactor for a reaction, the first-stage reactor employs a slurry bed reactor and an iron-based catalyst to separate a product of the first-stage Fischer-Tropsch synthesis reaction, and tail gas enters a CO2 removing unit; and a material flow without CO2 is introduced into a second-stage reactor, the second-stage reactor employs a tubular fixed bed reactor and a cobalt-based catalyst to separate a product of a second-stage Fischer-Tropsch synthesis reaction, a part of tail gas returns to the second-stage reactor for cyclic reaction, the inner surface of a reaction tube of the tubular fixed bed reactor is smooth, and the external surface of the reaction tube has a groove. The method overcomes the disadvantages of a low CO utilization rate, hardly controllable reaction heat release, a high catalyst deactivation rate, etc. of conventional process and improves reaction selectivity and liquid hydrocarbon yield.

Description

technical field [0001] The invention relates to a method for synthesizing liquid hydrocarbons from hydrogen and carbon monoxide (synthesis gas), more specifically, a two-stage Fischer-Tropsch synthesis method using synthesis gas as raw material. Background technique [0002] The method of catalytically converting hydrogen and carbon monoxide into aliphatic hydrocarbons was discovered by German scientists Frans Fischer and Hans Tropsch in 1923, so the reaction was named Fischer-Tropsch synthesis (Fischer-Tropsch synthesis) reaction. Through this reaction, clean fuels and other high value-added chemicals can be produced on a large scale, opening up a technical route for non-petroleum fuels. Germany carried out research in the 1920s and realized industrialization in 1936, but was gradually phased out after World War II due to the rise of the oil industry; South Africa was forced to develop oil because it had more coal and less oil, and was subject to economic and political sanc...

Claims

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Application Information

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IPC IPC(8): C10G2/00
Inventor 徐润胡志海聂红吴昊李猛田鹏程
Owner CHINA PETROLEUM & CHEM CORP
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