Method for optimizing the operation of a unit for the synthesis of hydrocarbons from a synthesis gas

a synthesis gas and operation optimization technology, applied in the field of optimizing the operation of the unit for the synthesis of hydrocarbons from the synthesis gas, can solve the problems of severe affecting the synthesis, and achieve the effects of preventing degradation of the selectivity, high performance, and maximizing the selectivity

Active Publication Date: 2012-10-02
INST FR DU PETROLE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]This method for controlling the Fischer-Tropsch synthesis means that high performances can be maintained, especially as regards the yield of heavy products (C5+ hydrocarbons). It can also maximize the selectivity for the heaviest hydrocarbons in the Fischer-Tropsch reaction and prevent degradation of the selectivity due to development of the CO conversion reaction (WGSR).

Problems solved by technology

However, under certain conditions, catalysts comprising cobalt may develop a CO conversion activity (WGSR) which then competes with the Fischer-Tropsch synthesis reaction and severely affects this synthesis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076]The Fischer-Tropsch synthesis reaction was operated in a device comprising an autoclave type continuously stirred three-phase reactor (CSTR [continuously stirred tank reactor]). This reactor could be maintained under pressure and at temperature and operated continuously. The reactor was supplied with a synthesis gas with a H2 / CO ratio which may be adjusted between 1.5 to 2.5.

[0077]The flow rate of the feed (synthesis gas) was monitored and could also be adjusted to increase or reduce the reaction time. Fischer-Tropsch synthesis was carried out at 230° C., 2 MPa, in the presence of 35 g of a catalyst containing 13% by weight of cobalt deposited on an alumina support having a specific surface area of approximately 150 m2 / g and a cubic gamma structure. The catalytic performances were evaluated by material balance by analyzing and measuring the various streams leaving the reactor. The compositions of the various departing streams (gas effluents, liquid hydrocarbon product and aque...

example 2

Example of Readjustment of Ratio after Modification of Operating Parameter

[0098]Case No 2 of Example 1 was assumed to be the starting point (feed flow rate of 70 Nl / h). The performances obtained after 50 hours of test were those indicated in Table 1.

[0099]The temperature of the Fischer-Tropsch reaction section was increased by 5° C. (T=235° C. and 2 MPa) without changing the feed flow rate (synthesis gas at rate of 70 Nl / h). This caused a modification in the ratio PH2O:PH2 which rose above 1 and an increase in the methane and carbon dioxide (CO2) selectivities. These conditions are summarized in case 13 of Table 2.

[0100]The operating conditions were kept constant (T=235° C. and 2 MPa), but the ratio PH2O:PH2 was adjusted by dint of increasing the feed flow rate which rose to 100 Nl / h (case 14). This produced a theoretical ratio PH2O:PH22 and methane selectivities, and a selectivity for C5+ hydrocarbons (hydrocarbons containing 5 or more carbon atoms) which was higher.

[0101]

TABLE 2R1...

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Abstract

The invention concerns a method for optimizing the operation of a reaction section for hydrocarbon synthesis starting from a feed comprising synthesis gas, operated in the presence of a catalyst comprising cobalt. This method comprises the following steps: a) determining the theoretical molar ratio, PH2O:PH2, in the reaction section; b) optionally, adjusting the ratio PH2O:PH2 determined in step a) to a value strictly below 1; c) determining the new value for the theoretical ratio PH2O:PH2 in the reaction section; and repeating steps a) to c) until the ratio of the partial pressures of water and hydrogen, PH2O:PH2, has a value strictly less than 1.1.

Description

[0001]The present invention relates to the field of the synthesis of hydrocarbons from a mixture comprising carbon monoxide (CO), hydrogen (H2) and possibly carbon dioxide (CO2), generally known as synthesis gas.[0002]The method of the invention means that the operation of a unit for synthesizing hydrocarbons starting from synthesis gas (also known as Fischer-Tropsch synthesis) can be optimized, or it can re-establish stable operation with a view to maximizing the yield of C5+ hydrocarbons (hydrocarbons containing 5 or more carbon atoms).[0003]The method of the invention is a method for controlling the Fischer-Tropsch synthesis in which the ratio of the partial pressures of water and hydrogen, PH2O:PH2, is used as a control parameter for said synthesis.PRIOR ART[0004]The reaction for converting synthesis gas (CO—(CO2—H2) mixture) into hydrocarbons has been known since the start of the twentieth century and is also termed the Fischer-Tropsch synthesis. The units were operated in Germ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C07C27/00
Inventor MARION, MARIE-CLAIREHUGUES, FRANCOIS
Owner INST FR DU PETROLE
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