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Method for reducing cobalt-base Fischer Tropsch synthesis catalyst

A technology for synthesis of catalysts and tropes, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as increased water pressure in the system, unfavorable industrial operations, and difficult to take away, etc., to achieve initial activity high effect

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for reducing cobalt-base Fischer Tropsch synthesis catalyst

Examples

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example 1

[0020] Loaded Cobalt-based Fischer-Tropsch Synthesis Catalyst 20%Co0.8%Pt3%Zr / SiO 2 (Wt.), under normal pressure, pass inert gas, space velocity is 500h -1 , completely replace the air in the reduction system with an inert gas at normal temperature and pressure, then maintain the pressure of the reduction system at 0.1 MPa, raise the temperature from room temperature to 300 °C at 1 °C / min, dry for 12 hours, and then cool down to 120 °C. switch concentration to 5% H 2 Mixed gas with inert gas, the space velocity is 2000h -1 , from 120°C to 300°C at 1°C / min, and then gradually increase the H in the mixture 2 The concentration is above 90%, reduced for 24 hours, and then cooled to 120°C. Introduce hydrogen containing 2% water vapor with a space velocity of 500h -1 , the temperature was raised from 120°C to 200°C at 1°C / min, maintained for 12 hours, and then lowered to 120°C. switch concentration to 5% H 2 Mixed gas with inert gas, the space velocity is 2000h -1 , from 120°...

example 2

[0023] Loaded Cobalt-based Fischer-Tropsch Synthesis Catalyst 20%Co1%Ni3%Zr / TiO 2 (Wt.), under normal pressure, pass inert gas, space velocity is 1500h -1 , use inert gas to completely replace the air in the reduction system at normal temperature and pressure, then increase the pressure of the reduction system to 1.0MPa, raise the temperature from room temperature to 400°C at 3°C / min, dry for 8 hours, and then cool down to 120°C . switch concentration to 5% H 2 Mixed gas with inert gas, the space velocity is 4000h -1 , from 120°C to 400°C at 3°C / min, and then gradually increase the H in the mixture 2 The concentration is above 90%, reduced for 8 hours, and then lowered to 120°C. Introduce hydrogen containing 4% methanol vapor at a space velocity of 1500h -1 , the temperature was raised from room temperature to 250°C at 3°C / min, maintained for 8 hours, and then cooled to 120°C. switch concentration to 5% H 2 Mixed gas with inert gas, space velocity 4000h -1 , from 120°C...

example 3

[0026] Loaded cobalt-based Fischer-Tropsch synthesis catalyst 20%Co0.05%Ru3%Zr / Al2 o 3 (Wt.), under normal pressure, pass inert gas, space velocity is 1000h -1 , use an inert gas to completely replace the air in the reduction system at normal temperature and pressure, then increase the pressure of the reduction system to 0.5MPa, raise the temperature from room temperature to 350°C at 2°C / min, dry for 10 hours, and then cool down to 120°C . switch concentration to 5% H 2 Mixed gas with inert gas, the space velocity is 3000h -1 , from 120°C to 350°C at 2°C / min, then gradually increase the H in the mixture 2 The concentration is above 90%, reduced for 16 hours, and then cooled down to 120°C. Introduce hydrogen containing 3% ethanol vapor at a space velocity of 1000h -1 , the temperature was raised from room temperature to 220°C at 2°C / min, maintained for 10 hours, and then cooled to 120°C. switch concentration to 5% H 2 Mixed gas with inert gas, the space velocity is 3000h...

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Abstract

The invention discloses a method for reducing a cobalt-base Fischer Tropsch synthesis catalyst. The method comprises a gas replacing and catalyst drying process, a reducing process and a passivating process. In the passivating process, mixed gas of water vapor or oxygen-containing organic steam and hydrogen is switched in a reduction system, wherein the volume concentration of the water vapor or the oxygen-containing organic steam in the mixed gas is in the range of 1 to 5 percent; the airspeed of the mixed gas is in the range of 500 to 2,000h<-1>; the passivating temperature is in the range of 180 to 280 DEG C; and the passivating time is in the range of 4 to 16h. For the cobalt-base Fischer Tropsch synthesis catalyst reduced by the method, when the high activity in the stationary phase is kept, the initial activity is also reduced.

Description

technical field [0001] The invention relates to a reduction method of a cobalt-based Fischer-Tropsch synthesis catalyst. Background technique [0002] The conversion of synthesis gas, ie carbon monoxide and hydrogen, into high value products is well known and has been used in industry for many years. Typical processes include: methanol synthesis, higher alcohol synthesis, hydroformylation and Fischer-Tropsch synthesis. Fischer-Tropsch synthesis refers to the reaction in which synthesis gas is catalyzed on a catalyst to synthesize hydrocarbon liquid fuels. 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. Catalyst is one of the key technologies of Fischer-Tropsch synthesis reaction. In the research of Fischer-Tropsch catalysts in the past 80 years, it has been found that Fe, Co and Ru are effective active components of Fischer-Tropsch catalysts. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/18B01J23/75C07C1/04C10G2/00
Inventor 李杰张舒冬倪向前陈楠张喜文
Owner CHINA PETROLEUM & CHEM CORP
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