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Work starting method for slurry bed Fisher-Tropsch synthesis

A Fischer-Tropsch synthesis and slurry bed technology, which is used in the preparation of liquid hydrocarbon mixtures and the petroleum industry, can solve the problems of accelerated catalyst deactivation, increased water pressure in the system, unfavorable industrial operation, etc., and achieves improved stability and initial activity. High and low selectivity effects

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction pressure of the Fischer-Tropsch synthesis process is in the range of 0.5-4MPa, and the increase in pressure is beneficial to the Fischer-Tropsch synthesis, so the reaction pressure used is mostly above 2.0MPa, and the system pressure is mostly maintained by the partial pressure of the synthesis gas. Too high initial activity and initial rapid deactivation are very unfavorable to industrial operations, and too high initial conversion of syngas results in a large amount of product water, which is difficult to be taken away quickly, causing moisture in the system The increase in pressure accelerates the deactivation of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Weigh an appropriate amount of reduced 20%Co0.8%Pt3%Zr / SiO 2 (Wt.) Fischer-Tropsch synthesis catalyst and paraffin, the volume ratio of catalyst and paraffin is 1:4, put it into the slurry bed reactor, and pass the mixed gas of hydrogen containing water vapor into the reactor after airtight and gas replacement And turn on the stirring device, the volume concentration of water vapor in the mixed gas is 2.5%, and the volumetric space velocity of the mixed gas is 1000h -1 , raise the temperature to 350°C, control the pressure to 3.5 MPa, cool down to 220°C and 2.0 MPa after 2.5 hours, switch to H 2 / CO=2 (molar ratio) synthesis gas for Fischer-Tropsch synthesis. The reaction effluent was collected by hot trap and cold trap respectively. The conversion rate of the catalyst, methane selectivity and 200h stability test results are listed in Table 1.

example 2

[0023] Weigh an appropriate amount of reduced 20%Co1%Ni3%Zr / TiO 2 (Wt.) Fischer-Tropsch synthesis catalyst and paraffin, the volume ratio of catalyst and paraffin is 1:5, put it into the slurry bed reactor, and pass the mixed gas of hydrogen containing methanol vapor into the reactor after airtight and gas replacement And turn on the stirring device, the volume concentration of water vapor in the mixed gas is 5%, and the volumetric space velocity of the mixed gas is 1500h -1 , raise the temperature to 300°C, control the pressure to 3MPa, after 1.5h, lower the temperature and pressure to 220°C and 2.0 MPa, switch to H 2 / CO=2 (molar ratio) synthesis gas for Fischer-Tropsch synthesis. The reaction effluent was collected by hot trap and cold trap respectively. The conversion rate of the catalyst, methane selectivity and 200h stability test results are listed in Table 1.

example 3

[0025] Weigh an appropriate amount of reduced 20%Co0.05%Ru3%Zr / Al 2 o 3 (Wt.) Fischer-Tropsch synthesis catalyst and paraffin, the volume ratio of catalyst and paraffin is 1:5, put it into the slurry bed reactor, pass the hydrogen mixed gas containing acetone vapor into the reactor after airtight and gas replacement And turn on the stirring device, the volume concentration of acetone vapor in the mixed gas is 2%, and the volumetric space velocity of the mixed gas is 800h -1 , raise the temperature to 250°C, control the pressure to 2.5MPa, after 1h, lower the temperature and pressure to 220°C, 2.0 MPa, switch to H 2 / CO=2 (molar ratio) synthesis gas for Fischer-Tropsch synthesis reaction. The reaction effluent was collected by hot trap and cold trap respectively. The conversion rate of the catalyst, methane selectivity and 200h stability test results are listed in Table 1.

[0026] Table 1 Reactivity of catalysts.

[0027] catalyst Initial activity and selectivi...

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Abstract

The invention relates to a work starting method for slurry bed Fisher-Tropsch synthesis, which is characterized in that a proper amount of a reduced ft synthesis catalyst and a reaction solvent are weighted and placed in a slurry bed reactor, after airtight and gas displacement, the hydrogen mixed gas containing water vapor or organic matter steam containing oxygen is introduced and a stirring device is switched on, the volume concentration of water vapor or oxygen-containing organic matter steam is 1-5%, the volume space velocity of the gas mixture is 500-2000h<-1>, the temperature is heated to 250-350 DEG C, the pressure is controlled at 2.5-3.5 MPa, the temperature and the pressure can be reduced after 1-3 hours to reach the Fisher-Tropsch synthesis reaction condition, and the synthesis gas is switched for Fisher-Tropsch synthesis reaction. The work starting method is used for keeping the high activity during the stable period of a cobalt-based Fischer-Tropasch synthetic catalyst, and reducing the initial activity of the catalyst.

Description

technical field [0001] The invention relates to a start-up method of slurry bed Fischer-Tropsch synthesis. Background technique [0002] Fischer-Tropsch synthesis refers to synthesis gas (CO+H 2 ) on the catalyst to catalyze the reaction of synthesizing hydrocarbon liquid fuel. With the increasing depletion of petroleum resources, the preparation of liquid fuels by Fischer-Tropsch synthesis has attracted more and more attention from all over the world. [0003] The processes used for F-T synthesis include fixed bed process, circulating fluidized bed process, fixed fluidized bed process and slurry bed process. The fixed bed reactor has the disadvantages of hot spots, clogging and low production capacity, the fluidization process of the circulating fluidized bed is difficult to control, the catalyst utilization rate is low and the wear is serious, and the production capacity is still low. Fixed fluidized bed is an improved form of circulating fluidized bed. It not only has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G2/00
Inventor 李杰袁长富张舒冬宋喜军张喜文倪向前
Owner CHINA PETROLEUM & CHEM CORP
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