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Method for reducing Fischer-Tropsch synthesis iron-based catalyst

An iron-based catalyst, Fischer-Tropsch synthesis technology, applied in the direction of chemical instruments and methods, catalyst activation/preparation, heterogeneous catalyst chemical elements, etc., can solve the problem of low catalyst activity, achieve high catalyst activity, reduce oxidation, The effect of low selectivity

Active Publication Date: 2017-04-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the H of the reducing gas used in this technique 2 Low / CO ratio, low catalyst activity due to high CO concentration, excessive carburization and carbon deposition of the catalyst

Method used

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  • Method for reducing Fischer-Tropsch synthesis iron-based catalyst
  • Method for reducing Fischer-Tropsch synthesis iron-based catalyst
  • Method for reducing Fischer-Tropsch synthesis iron-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0058] According to a preferred embodiment of the present invention, the preferred reducing conditions further include: a pressure of 2-5 MPa, preferably 2.5-3.5 MPa.

[0059] According to a preferred embodiment of the present invention, such as figure 1 Shown, the present invention carries out as follows:

[0060] The mixed gas mixed with fresh reducing gas (abbreviated as fresh synthesis gas in the figure) and circulating gas is dehydrated in the dehydration tank 1, enters the preheater 3 for preheating, and then enters the reduction reactor from the bottom of the reduction reactor 2; The catalyst slurry obtained by mixing the microspherical Fischer-Tropsch synthesis iron-based catalyst with liquid paraffin (or heavy diesel oil) is added into the reduction reactor from the catalyst slurry tank 8 to be reduced, the reactor is pressurized and heated, and the The gas enters the cooler 4 for condensing and cooling, and then enters the gas-liquid separator 5 for gas-liquid separ...

preparation example

[0068] This preparation example is used to illustrate the preparation of an iron-based catalyst for Fischer-Tropsch synthesis of the present invention.

[0069] Weigh 10.0kg Fe(NO 3 ) 3 9H 2 O, 0.18kg Cu(NO 3 ) 2 ·3H 2 O, add 32L deionized water and stir to dissolve to obtain a mixed solution of iron salt. Weigh 7.0kg Na 2 CO 3, Add 20L of deionized water and stir to dissolve to obtain an alkaline salt solution. Heat the above-mentioned iron salt mixed solution and alkaline salt solution to above 80°C respectively, and then add them into a vigorously stirred reaction tank, control the precipitation temperature in the reaction tank to 80°C, pH value to 7.5, stirring speed at 80rpm, and react for 40 minute. After the precipitation, the precipitated slurry was aged for 1 hour, vacuum filtered, and washed repeatedly with deionized water for 4 times to obtain a filter cake.

[0070] Add 3.5 kg of potassium silicate aqueous solution with a mass concentration of 20% to the ...

Embodiment 1

[0072] Add 40g of Catalyst-1 and 800mL of liquid paraffin in a 2L stirred tank reduction reactor, replace the air in the reactor with nitrogen, and continuously feed 60% by volume of nitrogen, 36.5% by volume of hydrogen, and 3.5% by volume of CO into the reactor. Fresh reducing gas, fresh reducing gas space velocity is 4500h -1 , boost the pressure of the reduction reactor to 2.7MPa, start stirring so that the stirring speed is 600rpm, and heat up according to the set program. The specific heating process is as follows:

[0073] The heating conditions of the reduction reactor are as follows: the heating rate of normal temperature -120°C is 15°C / h, 120°C constant temperature 4h; the heating rate of 120-230°C is 6°C / h, 230°C constant temperature 4h; 4°C / h, constant temperature at 260°C for 24h;

[0074] The gas from the top of the reactor is condensed and cooled to separate oil and water, and then part of it is discharged directly as tail gas, and the other part of the gas is ...

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Abstract

The invention relates to the field of reduction of a Fischer-Tropsch synthesis catalyst, and concretely relates to a method for reducing a Fischer-Tropsch synthesis iron-based catalyst. The method comprises the following steps: under existence of reduction gas, a slurry containing the Fischer-Tropsch synthesis iron-based catalyst is subjected to temperature programmed reduction, the temperature programmed reduction comprises the following steps: under normal temperature to 120 DEG C, the heating rate is 10-20 DEG C / h, then the catalyst is kept at the constant temperature of 120 DEG C for 2-8 h; under 120 DEG C to (220-230) DEG C, the heating rate is 5-10 DEG C / h, then the catalyst is kept at the constant temperature of 220 DEG C-230 DEG C for 3-10 h; under (220-230)DEG C to (260-280)DEG C, the heating rate is 3-5 DEG C / h, and then the catalyst is kept at the constant temperature of 260 DEG C-280 DEG C for 10-30 h. The method solves the problem that a liquid solvent is greatly taken out such as paraffin during the catalyst reduction process, influence of the iron-based catalyst in the reduction process is reduced, catalyst is not broken, the activity of the reduced catalyst is high, CO2 selectivity is low, and the light hydrocarbon selectivity is low.

Description

technical field [0001] The invention relates to a reduction method of a Fischer-Tropsch synthesis iron-based catalyst. Background technique [0002] Fischer-Tropsch synthesis refers to the synthesis gas (H 2 +CO), the process of synthesizing hydrocarbon liquid fuels in the presence of metal catalysts such as iron, cobalt, and ruthenium. Using a slurry bed reactor for Fischer-Tropsch synthesis reaction has many advantages such as uniform mixing of gas, liquid and solid phases, small pressure drop, good heat transfer effect, easy control of reaction temperature, and online update of the catalyst, so it has become a research and development and Follow hot spots. [0003] Iron-based Fischer-Tropsch synthesis catalysts have excellent water-gas shift reaction activity and can use low H 2 Coal-based synthesis gas with / CO ratio can be directly used in slurry bed Fischer-Tropsch synthesis reaction without prior transformation, and it is cheap and easy to obtain, so it has great i...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/18
CPCB01J23/83B01J37/18B01J2523/00B01J2523/842B01J2523/17B01J2523/3725B01J2523/13B01J2523/41
Inventor 孟祥堃胡云剑刘潇杜冰吕毅军门卓武孙守理
Owner CHNA ENERGY INVESTMENT CORP LTD
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