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Fischer-Tropsch synthesis method

A technology of Fischer-Tropsch synthesis and synthesis gas, which is applied in the preparation of liquid hydrocarbon mixtures, the petroleum industry, and the production of hydrocarbons from carbon oxides. It can solve the problems of large axial temperature difference in the reactor, difficult control of the reaction temperature, and obvious hot spots. To achieve the effect of reducing the risk of overheating

Active Publication Date: 2013-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a Fischer-Tropsch synthesis method on the basis of the prior art, which overcomes the shortcomings of a fixed-bed Fischer-Tropsch synthesis reactor with a large axial temperature difference, obvious hot spots and difficult control of the reaction temperature, while ensuring that the paraffin product in the product The proportion will not decrease

Method used

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Embodiment 1

[0050] This embodiment adopts figure 1 In the technical scheme shown, all the reaction products of the first Fischer-Tropsch synthesis reactor (slurry bed reactor) enter the second Fischer-Tropsch synthesis reactor (fixed-bed reactor).

[0051] The operating conditions of the slurry bed reactor are: temperature 210°C, pressure 3.0MPa, reactor inlet H / C molar ratio 2.11.

[0052] The operating conditions of the fixed bed reactor are: the average temperature is 215°C, the pressure is 3.0MPa, and the H / C molar ratio at the reactor inlet is 1.98.

[0053] The gas flow rate is: the fresh synthesis gas flow rate is 16.67L / min (gas volume space velocity is 1000h -1 ), the reactor 2 circulation gas flow rate is 50.01L / min, and the reactor 5 circulation gas flow rate is 20.01L / min.

[0054] The synthesis reaction effect, the distribution of synthetic oil products and the axial temperature distribution of the fixed bed reactor are shown in Table 1.

[0055] Table 1

[0056] ...

Embodiment 2

[0058] This embodiment adopts figure 2 In the technical scheme shown, the gas I obtained by separating the reaction effluent of the first Fischer-Tropsch synthesis reactor (slurry bed reactor) enters the second Fischer-Tropsch synthesis reactor (fixed-bed reactor).

[0059] The operating conditions of the slurry bed reactor are: temperature 212°C, pressure 2.8MPa, reactor inlet H / C molar ratio 2.05.

[0060] The operating conditions of the fixed-bed reactor are: temperature 219°C, pressure 2.8MPa, reactor inlet H / C molar ratio 2.00.

[0061] The gas flow rate is: fresh syngas flow rate 12.50L / min (gas volume space velocity is 750h -1 ), the reactor 2 circulation gas flow rate is 43.75L / min, and the reactor 15 circulation gas flow rate is 15.00L / min.

[0062] The synthesis reaction effect of the slurry bed and the fixed bed together, the distribution of the synthetic oil product and the axial temperature distribution of the fixed bed reactor are shown in Table 2.

[0063] T...

Embodiment 3

[0066] This embodiment adopts image 3 In the technical scheme shown, the first Fischer-Tropsch synthesis reactor (slurry bed reactor) reaction effluent separation gas I and low-temperature condensate enter the second Fischer-Tropsch synthesis reactor (fixed-bed reactor).

[0067] The operating conditions of the slurry bed reactor are: temperature 212°C, pressure 3.0MPa, reactor inlet H / C molar ratio 2.02.

[0068] The operating conditions of the fixed bed reactor are: temperature 215°C, pressure 3.0MPa, reactor inlet H / C molar ratio 1.92.

[0069] The gas flow rate is: fresh syngas flow rate 8.33L / min (gas volume space velocity is 500h -1 ), the circulating gas flow rate of reactor 2 is 33.32 L / min, and the circulating gas flow rate of reactor 15 is 11.65 L / min.

[0070] The synthesis reaction effect of the slurry bed and the fixed bed together, the distribution of the synthetic oil product and the axial temperature distribution of the fixed bed reactor are shown in Table 3...

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Abstract

The invention provides a Fischer-Tropsch synthesis method. The invention adopts two Fischer-Tropsch synthesis reaction vessels in serial connection, wherein the first Fischer-Tropsch synthesis reaction vessel is a slurry bed reaction vessel, and the second Fischer-Tropsch synthesis reaction vessel is a fixed bed reaction vessel. Outflow materials of the first Fischer-Tropsch synthesis reaction vessel fully or partially enter the second Fischer-Tropsch synthesis reaction vessel for carrying out synthesis reaction, and H2 and / or CO is injected between the two Fischer-Tropsch synthesis reaction vessels for regulating the molar ratio of H / C at an inlet of the second Fischer-Tropsch synthesis reaction vessel. The method provided by the invention overcomes the defects of great axial temperaturedifference, obvious heat point and difficult control of the reaction temperature of the fixed bed Fischer-Tropsch synthesis reaction vessel, and simultaneously ensures that the proportion of paraffinproducts in the products can not be reduced.

Description

technical field [0001] The invention relates to a method for producing liquid hydrocarbons through Fischer-Tropsch synthesis using synthesis gas as a raw material, in particular to a Fischer-Tropsch synthesis method with two reactors connected in series. Background technique [0002] Petroleum is an important strategic material to ensure the country's economic lifeline and political security. Since the 1990s, my country's oil consumption has continued to grow, greatly exceeding the growth rate of crude oil production during the same period, and it has to rely on imports to supplement the shortage of domestic resources. Since my country became a net importer of oil in 1993, the gap between oil supply and demand has been expanding year by year. In 2007, my country imported more than 160 million tons of crude oil, and its dependence on foreign countries exceeded 45%. Such large-scale oil imports have increased my country's dependence on foreign oil, and fluctuations and change...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/04C10G2/00C07C9/14
Inventor 吴昊胡志海聂红徐润侯朝鹏田鹏程夏国富
Owner CHINA PETROLEUM & CHEM CORP
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