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
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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]
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