Overcritical Fischer-Tropsck synthesis method

A Fischer-Tropsch synthesis and supercritical technology, used in chemical instruments and methods, bulk chemical production, metal/metal oxide/metal hydroxide catalysts, etc., to achieve a simple preparation process, reduce bed temperature flying, prevent The effect of catalyst deactivation

Inactive Publication Date: 2008-07-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supercritical Fischer-Tropsch synthesis of molten iron catalysts has not been reported so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a fixed-bed reactor using molten iron catalyst, the supercritical medium is n-hexane, the controlled reaction temperature is 518K, the total reaction pressure is 6.0Mpa, the partial pressure of the synthesis gas is 2.0Mpa, the partial pressure of the medium is 4.0Mpa, and the synthesis gas air is Speed ​​is 10800h -1 , H 2 / CO=2. The reaction reached a steady state after 6 h. A cold trap is used to collect the liquid phase at the outlet of the reactor, and a liquid phase storage tank is installed after the cold trap to facilitate the collection of the mixture of the supercritical medium and the liquid phase product. CO conversion rate is 77.2%, methane selectivity is 3.31 (mol%), CO 2 The selectivity was 36.97 (mol%). However, under the same conditions, the CO conversion rate of the gas-phase Fischer-Tropsch synthesis is only 52.8%, the methane selectivity is 4.54 (mol%), and the CO conversion rate is only 52.8%. 2 The selectivity was 39.06 (mol%). details as f...

Embodiment 2

[0032] In a fixed-bed reactor using molten iron catalyst, the supercritical medium is n-pentene, the reaction temperature is controlled at 498K, the total reaction pressure is 6.0Mpa, the partial pressure of the synthesis gas is 2.0Mpa, the partial pressure of the medium is 4.0Mpa, the synthesis gas Airspeed is 5400h -1 , the catalyst particle size is 0.043-0.075mm, H 2 / CO=2. After 6 hours, the reaction reached a steady state. A cold trap was used to collect the liquid phase at the outlet of the reactor, and a liquid phase storage tank was installed behind the cold trap to facilitate the collection of the mixture of the supercritical medium and the liquid phase product. The CO conversion rate was 56.6%, and the methane selectivity was 3.25 (mol%).

Embodiment 3

[0034] In a fixed-bed reactor using molten iron catalyst, the supercritical medium is benzene, the reaction temperature is controlled at 578K, the total reaction pressure is 6.0Mpa, the partial pressure of the synthesis gas is 2.0Mpa, the partial pressure of the medium is 4.0Mpa, and the space velocity of the synthesis gas is 10800h -1 , the catalyst particle size is 0.45-0.90mm, H 2 / CO=2. After 6 hours, the reaction reached a steady state. A cold trap was used to collect the liquid phase at the outlet of the reactor, and a liquid phase storage tank was installed behind the cold trap to facilitate the collection of the mixture of the supercritical medium and the liquid phase product. The CO conversion rate was 88.6%, and the methane selectivity was 8.2 (mol%).

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PUM

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Abstract

The invention discloses a method of super-critical Fischer-Tropsch synthesis, using molten-iron as catalyst to convert synthetic gas (CO+H2) into hydrocarbon in the presence of supercritical media. The process comprises as follows: mixing the synthetic gas and supercritical media, performing super-critical Fischer-Tropsch synthesis under the conditions of temperature of 180-350DEG C, pressure of 3.0-10.0MPa and synthetic gas airspeed of 1000h-1-30000h-1 and converting the synthetic gas into liquid fuel. The molten-iron catalyst has the advantages of easy obtaining of raw material, strong abrasive resistance, high space time yield, high selectivity of olefin, simple preparing process, stable catalyst property, more suitability of industrial production and the like. Under the same reaction condition, compared with gas-phase and liquid-phase Fischer-Tropsch synthesis, the super-critical Fischer-Tropsch synthesis can reduce temperature jump of beds, decrease carbon deposit on surface of the catalyst, prevent devitalization of the catalyst and prolong the service life of the catalyst. In terms of reaction property, the invention can increase conversion rate of CO, reduce selectivity of methane and increase selectivity of C5+ and olefin in products.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis method, in particular to a supercritical Fischer-Tropsch synthesis method. Background technique [0002] Syngas (CO+H 2 ) is converted into hydrocarbon products through catalyst action, referred to as Fischer-Tropsch synthesis. [0003] Fischer-Tropsch synthesis catalysts mainly include Co, Fe, and Ru catalysts, and their relative prices are Fe:Co:Ru=1:1000:5000. Due to the high price of Ru, only Fe and Co are commercially applicable elements. The cobalt catalyst has no or only weak water vapor shift activity, and the H of the syngas 2 The / CO ratio must be 2.0-2.3; while the iron catalyst has a strong water vapor shift activity and can utilize low H 2 / CO ratio of synthesis gas [The Fischer-Tropsch process: 1950-2000. Mark E. Dry. Catalysis Today. 2002, 71: 227-241]. With the gradual rise of international oil prices, the indirect liquefaction of coal to generate liquid fuels through Fischer-Tro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/06B01J23/74
CPCY02P20/54
Inventor 刘化章唐浩东
Owner ZHEJIANG UNIV OF TECH
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