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A reduction method for iron-based catalysts in slurry-bed Fischer-Tropsch synthesis

An iron-based catalyst and Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, catalyst activation/preparation, preparation of liquid hydrocarbon mixtures, etc., can solve problems affecting the normal operation of the reactor, excessive carbon deposition on the catalyst, and affecting catalyst activity , to achieve the effect of strong wear resistance, less carbon deposition on the catalyst, and less carburization of the catalyst

Active Publication Date: 2016-02-24
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong carbon deposition ability of CO, it is easy to cause excessive carbon deposition on the catalyst during the reduction process, which will affect the activity of the catalyst.
In a slurry bed reactor, excessive carburization will cause a large amount of damage to the catalyst, block the wax filter, and affect the normal operation of the reactor

Method used

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  • A reduction method for iron-based catalysts in slurry-bed Fischer-Tropsch synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 10g of Fischer-Tropsch synthesis iron-based catalyst and 400g of liquid paraffin with an initial boiling point greater than 280°C into the slurry bed reactor, and the catalyst composition is 100Fe / 3Cu / 1K / 20SiO 2 (for mass ratio). The reduction reactor was filled with N 2 Inject C after gas purging 2 h 4 , adjust the reactor pressure to 3.0MPa, and the space velocity to 1000h -1 , the circulation ratio is 8, and the reactor is raised from room temperature to 270°C with a temperature increase rate of 10°C / h for 24h to obtain the reduced iron-based catalyst, denoted as A.

[0035] After the reduction is completed, switch the reduction condition to the reaction condition to carry out the Fischer-Tropsch synthesis reaction. The reaction conditions are: the reaction temperature is 260°C, the pressure is 3.0MPa, and the raw material gas is H 2 / CO=2.0 (molar ratio), the space velocity is 5000h -1 , and the cycle ratio is 2.0.

[0036] The performance evaluation resu...

Embodiment 2

[0038] Add 15g of Fischer-Tropsch synthesis iron-based catalyst and 450g of liquid paraffin with an initial boiling point greater than 280°C into the slurry bed reduction reactor, and the catalyst composition is 100Fe / 5Mn / 2K / 20SiO 2 (for mass ratio). The reduction reactor was filled with N 2 H was introduced after gas purging 2 / C 2 h 4 (Molar ratio is 30:1) mixed gas, adjust the reactor pressure to 3.0MPa, and the space velocity to 2000h -1 , the reactor was raised from room temperature to 250°C with a temperature increase rate of 10°C / h and then kept at a constant temperature for 48h to obtain the reduced iron-based catalyst, denoted as B. There is no exhaust gas circulation during the reduction process.

[0039] After the reduction is completed, switch the reduction condition to the reaction condition to carry out the Fischer-Tropsch synthesis reaction. The reaction conditions are: the reaction temperature is 270°C, the pressure is 3.0MPa, and the feed gas is H 2 / CO...

Embodiment 3

[0042] Add 8g of Fischer-Tropsch synthesis iron-based catalyst and 400g of liquid paraffin with an initial boiling point greater than 320°C into the slurry bed reduction reactor, and the catalyst composition is 100Fe / 5Mo / 6K / 15SiO 2 (for mass ratio). The reduction reactor was filled with N 2 H was introduced after gas purging 2 / CH 4 (molar ratio is 5:1) mixed gas, adjust the reactor pressure to 1.5MPa, and the space velocity to 3000h -1 , the circulation ratio is 5, and the reactor is raised from room temperature to 280° C. with a temperature increase rate of 5° C. / h for 36 hours to obtain the reduced iron-based catalyst, denoted as C.

[0043] After the reduction is completed, switch the reduction condition to the reaction condition to carry out the Fischer-Tropsch synthesis reaction. Reaction condition is: reaction temperature 255 ℃, pressure is 3.0MPa, raw material gas is H 2 / CO=2.0 (molar ratio), the space velocity is 5000h -1 , and the cycle ratio is 3.0.

[0044]...

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PUM

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Abstract

The invention discloses a reducing method of a slurry bed Fischer-Tropsch synthesis iron-based catalyst. The method comprises the following steps: adding the iron-based catalyst and a reducing medium into a slurry bed reactor, and uniformly mixing; and letting a hydrocarbon gas or a mixed gas comprising hydrogen and the hydrocarbon gas into the slurry bed reactor, and carrying out a reducing reaction to realize the reduction of the iron-based catalyst. Compared with the prior art, the reducing method disclosed in the invention has the advantages of less carbon deposition, high activity and good stability of the reduced catalyst, can effectively adjust the product selectivity of the catalyst, and allows the C5-30 selectivity in the product to be high. The carburization of the reduced catalyst is less, so the abrasion resistance of the reduced catalyst is strong.

Description

technical field [0001] The invention relates to a reduction method of a slurry bed Fischer-Tropsch synthesis iron-based catalyst. Background technique [0002] Fischer-Tropsch synthesis refers to the process of converting synthesis gas into oil and chemicals under the action of a catalyst. my country is a country with more coal and less oil. Petroleum resources are relatively scarce. In order to meet the needs of vehicle fuel and chemicals, my country needs to import a large amount of petroleum every year. In recent years, my country's dependence on foreign oil has exceeded 50%, seriously affecting national energy security. Using coal as the source to prepare synthesis gas, and then converting the synthesis gas into oil and chemicals through the Fischer-Tropsch synthesis reaction can transform my country's abundant coal resources into extremely scarce fuels, greatly alleviating the national energy security situation. [0003] Commonly used catalysts for Fischer-Tropsch sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/16B01J23/78B01J23/889B01J23/887B01J23/86B01J23/80C10G2/00
Inventor 王洪白云坡郑林王珏王缠和青明杨勇李永旺
Owner SYNFUELS CHINA TECH CO LTD
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