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Fixed bed fischer-tropsch synthesis method

A technology of Fischer-Tropsch synthesis and Fischer-Tropsch synthetic oil, which is applied in the preparation of liquid hydrocarbon mixtures and the petroleum industry. It can solve the problems that the overall performance of the catalyst cannot be uniformly exerted, so as to reduce the axial temperature difference, increase the yield, and improve the selectivity. sexual effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Fischer-Tropsch synthesis is a strongly exothermic reaction, there is a large temperature gradient in the catalyst bed of the fixed-bed Fischer-Tropsch synthesis reactor under normal conditions, so that the overall performance of the catalyst cannot be evenly exerted.

Method used

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Experimental program
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Effect test

Embodiment 1

[0034] The Fischer-Tropsch synthesis reaction was carried out on the aforementioned fixed-bed Fischer-Tropsch synthesis test device. Firstly, the working condition test (working condition 1) without injection of high-temperature Fischer-Tropsch synthetic oil was carried out. The operating conditions of the device are: average reaction temperature 215°C, pressure 2.5MPa, reactor inlet H 2 / CO molar ratio is 2.0, synthesis gas volume space velocity is 500h -1 , Cycle ratio 8. After the device operated stably for 100 hours, the axial temperature difference of the reactor and the Fischer-Tropsch synthesis reaction effect were calculated, and the amount of oil produced by the reaction was 78.8g / h.

[0035] Then, inject the low-temperature condensate of the high-temperature Fischer-Tropsch synthesis (working condition 2) into the inlet of the reactor, and the injection amount is twice the amount of synthetic oil produced in the previous stage, that is, 78.8g / h. After the oil was ...

Embodiment 2

[0043] The Fischer-Tropsch synthesis reaction was carried out on the aforementioned fixed-bed Fischer-Tropsch synthesis test device. First, the working condition test (working condition 3) without injection of high-temperature Fischer-Tropsch synthetic oil was carried out. The operating conditions of the device are: average reaction temperature 218°C, pressure 2.5MPa, reactor inlet H 2 The / CO molar ratio is 2.1, and the volumetric space velocity of the syngas is 700h -1 , Cycle ratio 6. After the device operated stably for 100 hours, the axial temperature difference of the reactor and the Fischer-Tropsch synthesis reaction effect were calculated, and the amount of oil produced by the reaction was 111.0g / h.

[0044] Then, inject the low-temperature condensate of the high-temperature Fischer-Tropsch synthesis (working condition 4) into the reactor inlet, and the injection amount is twice the amount of synthetic oil generated in the previous stage, that is, 222g / h. After the ...

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Abstract

The invention discloses a fixed bed fischer-tropsch synthesis method. A synthesis gas and high-temperature method fischer-tropsch synthesis oil enter a fixed bed fischer-tropsch synthesis reactor, and are subjected to fischer-tropsch synthesis reaction under the action of a catalyst; and effluent of the reactor is separated to obtain the gas, liquid hydrocarbon and water. According to the fixed bed fischer-tropsch synthesis method, the axial temperature difference of the fixed bed fischer-tropsch synthesis reactor is effectively reduced; the temperature distribution of a catalyst bed is more uniform; the selectivity of liquid hydrocarbon products is improved; and the diesel distillate efficiency of the synthesis oil is increased through further chain increase of the high-temperature method fischer-tropsch synthesis oil.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis method, in particular to a low-temperature fixed-bed Fischer-Tropsch synthesis method. Background technique [0002] Fischer-Tropsch synthetic oil has the characteristics of high content of straight-chain alkanes. After the Fischer-Tropsch synthetic oil is hydrotreated, the cetane number of the diesel fraction can reach more than 80. Therefore, improving the yield of Fischer-Tropsch synthetic oil and diesel is one of the main directions for the development of Fischer-Tropsch synthesis technology. [0003] Fixed-bed Fischer-Tropsch synthesis is one of the main technologies developed for Fischer-Tropsch synthesis due to its simple operation. Since Fischer-Tropsch synthesis is a strong exothermic reaction, under normal conditions, there is a large temperature gradient in the catalyst bed of the fixed-bed Fischer-Tropsch synthesis reactor, so that the overall performance of the catalyst cannot be unifor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G2/00
CPCC10G2/00
Inventor 吴昊高晓冬聂红胡志海李猛徐润侯朝鹏田鹏程
Owner CHINA PETROLEUM & CHEM CORP
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