Fischer-Tropsch process device and technology

A Fischer-Tropsch synthesis and process technology, which is used in the production of hydrocarbons from carbon oxides, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as deactivation of catalysts due to reaction heat, and achieve the effect of reducing the deactivation rate.

Inactive Publication Date: 2013-03-20
AMERICAN NEW OIL TECH CORP
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Problems solved by technology

[0007] The invention aims to solve the problems of removal of reaction heat and catalyst deactivation in the process of Fischer-Tropsch reaction, especially for Fischer-Tropsch synthesis of synthesis gas prepared by air gasification, and provides a Fischer-Tropsch synthesis device and corresponding process

Method used

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  • Fischer-Tropsch process device and technology
  • Fischer-Tropsch process device and technology
  • Fischer-Tropsch process device and technology

Examples

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example 1

[0038] A three-stage fixed-bed reactor system in series, the three reactors all use the same cobalt-based catalyst, the products at the outlet of each reactor are cooled to separate hydrocarbon products and water, and the tail gas is sent to the next-stage reactor. Each reactor has no side hydrogen supply, and the operating conditions of the reactors are shown in Table 1. The ratio of hydrogen to water at the outlet of the second-stage reactor is 0.87. Under this working condition, the rapid deactivation of the catalyst will not be caused, but the ratio of hydrogen to carbon and the ratio of hydrogen to water at the outlet of the third-stage reactor are reduced to 0.18 and 0.1 respectively. , the deactivation rate of the catalyst is significantly accelerated, and normal operation becomes very difficult.

[0039] Table 1 Three-stage non-circulation series reactor without side line hydrogen supplement

[0040]

example 2

[0042] A three-stage fixed-bed reactor system in series, the three reactors all use the same cobalt-based catalyst, the products at the outlet of each reactor are cooled to separate hydrocarbon products and water, and the tail gas is sent to the next-stage reactor. The first-stage reactor has no side line hydrogen supplement, and the second and third-stage reactors have side line hydrogen supplement to increase the carbon-hydrogen ratio of the feed gas. The operating conditions of the reactors are shown in Table 2. Due to the use of side line to supplement hydrogen, the ratio of hydrogen to water at the outlet of the second-stage and third-stage reactors was 0.94 to 0.82 respectively, and the catalyst was not rapidly deactivated due to the protection of a sufficient amount of hydrogen. Compared with example 1, in the case of similar total conversion rate, due to the increase of hydrogen partial pressure, the kinetic efficiency of the catalyst is improved, and the amount of supp...

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Abstract

The invention relates to a Fischer-Tropsch process device and a technology, belonging to the technical field of Fischer-Tropsch process realization. Based on loop free series-wound multi-level fixed bed reactors, the invention mainly aims at synthesis gas prepared by air or oxygenized air rather than non-pure oxygen gasification. The synthesis gas is rich in nitrogen, inert gas and other non-effective gases, and the conversion ratio of the reaction system at each level is controlled well, thereby effectively solving the heat transmission problem inside the reactors. The reaction system at each level is provided with independent hydrogen supply to use a small amount of hydrogen to adjust C / H ratio of gas pre-entering the reaction system at the level, thereby realizing preset conversion ratio of the synthesis gas, greatly reducing deactivation rate of catalyst, improving operation stability of the reactor and reducing operation cost. The method has obvious effect for a second-level reactor and subsequent reactors.

Description

【Technical field】 [0001] The invention relates to a Fischer-Tropsch synthesis reaction for converting synthesis gas containing hydrogen and carbon monoxide into liquid hydrocarbon compounds under the action of a catalyst, in particular to a Fischer-Tropsch synthesis device and process. 【Background technique】 [0002] The Fischer-Tropsch synthesis reaction is a chemical process that converts hydrogen and carbon monoxide in the synthesis gas into a hydrocarbon mixture. The synthesis gas can come from the gasification of hydrocarbons such as coal, natural gas, biomass, coke oven gas, or refining oil residue The product, the synthetic catalyst can be iron-based or cobalt-based catalyst. Generally speaking, iron-based catalysts are prepared by precipitation method, while cobalt-based catalysts use alumina, silicon oxide, titanium oxide, activated carbon, or their combination as carriers. The target products of Fischer-Tropsch synthesis can be hydrocarbon products such as gasolin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/02C07C1/04
Inventor 詹晓东
Owner AMERICAN NEW OIL TECH CORP
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