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Solvent and method for removing carbon dioxide from Fischer-Tropsch synthesis circulation gas

A technology of carbon dioxide and Fischer-Tropsch synthesis, which is applied in combustible gas purification, combustible gas purification/transformation, liquid hydrocarbon mixture recovery, etc., can solve the problems of activator consumption, serious corrosion, solution deterioration, etc., to overcome high regeneration heat consumption, Reduced regeneration heat consumption and good solution stability

Active Publication Date: 2008-07-02
SINOPEC NANJING RES INST OF CHEM IND CO LTD
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AI Technical Summary

Benefits of technology

This patented technology helps reduce CO2 emissions during production without sacrificing productivity or causing damage caused by excessive energy usage. It also improves upon traditional methods for decompositing solvents used in chemical reactions like alcohols into gases that are less harmful compared with other processes such as combustion engines.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency of removing unwanted gases like nitrous oxides during production of fuel components through Fischer - Tropesynthesis techniques involving reducing emissions while maintaining stable operation over time.

Method used

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  • Solvent and method for removing carbon dioxide from Fischer-Tropsch synthesis circulation gas

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Embodiment 1

[0022] A coal-water slurry as raw material, Texaco furnace for gas production, iron-based catalyst, Fischer-Tropsch synthesis slurry bed reactor, decarburization of circulating gas with potassium carbonate concentration of 28 (m)%, corrosion inhibitor pentoxide The concentration of vanadium is 5%, the concentration of the mixture of inorganic activators boric acid, selenous acid and vanadium pentoxide is 9%; the temperature of the absorption operation is 90°C at the top of the tower, 115°C at the bottom of the tower, the pressure is 2.7Mpa, and the CO2 content in the circulating gas is 22% , the residual CO2 in the absorption tower is less than 0.6%, the hydrocarbon consumption is less than 1.0%, and the absorption capacity of the solution is about 22Nm3CO2 / m3 solution, which can meet the decarburization requirements of the designed Fischer-Tropsch synthesis cycle gas, and the regeneration heat consumption of the solution is less than or equal to 3330 kJ / Nm3 CO2.

Embodiment 2

[0024] A pulverized coal as raw material, using Shell pulverized coal furnace to generate gas, using iron-manganese composite catalyst, Fischer-Tropsch synthesis slurry bed reactor, decarburization of circulating gas with potassium carbonate concentration of 26 (m)%, corrosion inhibitor pentoxide The concentration of vanadium is 5%, the concentration of the mixture of inorganic activators boric acid, antimonic acid and vanadium pentoxide is 9%; the temperature of the absorption operation is 90°C at the top of the tower, 116°C at the bottom of the tower, the pressure is 2.6 Mpa, and the CO2 content in the circulating gas is 20%. The residual CO2 in the absorption tower is less than 1.0%, the hydrocarbon consumption is less than 0.6%, and the solution absorption capacity is about 20Nm3CO2 / m3 solution, which can meet the designed Fischer-Tropsch synthesis cycle gas decarburization requirements, and the regeneration heat consumption of the solution is ≤3330 kJ / Nm3 CO2 .

Embodiment 3

[0026] One uses crushed coal as raw material, uses Lurgi furnace to generate gas, uses iron-based composite catalyst, and Fischer-Tropsch synthesis slurry bed reactor. The decarburization of circulating gas uses potassium carbonate concentration of 27 (m)%, corrosion inhibitor pentoxide The concentration of vanadium is 5%, the concentration of the mixture of inorganic activators boric acid and telluric acid is 5%, the concentration of organic activators, the mixture of glycine, methylimidazole and 2 amino-2 methyl-1 propanol is 3%; absorption operation temperature The top of the tower is 90°C, the bottom of the tower is 108°C, the pressure is 2.7Mpa, the CO2 content in the circulating gas is 19%, the residual CO2 out of the absorption tower is <1.0%, the hydrocarbon consumption is <0.5%, and the absorption capacity is about 29Nm3CO2 / m3 solution, which meets the Fischer-Tropsch Synthetic cycle gas decarbonization requirements, solution regeneration heat consumption ≤ 3320kJ / Nm3C...

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Abstract

The invention relates to a solvent and a method for removing CO2 in mixture gas of recycling gas of Fischer-Tropsch synthesis. A carbon removal solution comprises potassium carbonate, an inhibitor, an inorganic activator and an organic activator. The method comprises removing the majority of oxygen-containing organic matters and heavy hydrocarbons containing more than six carbon atoms in the recycling gas by a water washing tower and recovering the organic matters via waste water treatment; flash-evaporating the majority of H2, CO and light hydrocarbons dissolved in a rich liquid by a rich liquid flash tank, and recovering; and desorbing the solvent by using pressure swing regeneration and power saving technology. During removal of CO2 in the recycling gas of Fischer-Tropsch synthesis, the invention adopts the carbon removal process to achieve low hydrocarbon loss and good solution stability and to overcome the disadvantage of high regeneration heat consumption. The regeneration heat consumption is not larger than 344 kJ/Nm<3>CO2, which is lower than that of the conventional potassium carbonate process by over 30%.

Description

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Claims

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Application Information

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Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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