ADDITIVE INJECTION IN A HYDROCARBON SYNTHESIS UNIT FROM SYNTHESIS GAS FOR CONTROLLING AND MAINTAINING HOMOGENEOUS CATALYST CONCENTRATION

摘要

The subject of the present invention is a process for the synthesis of hydrocarbons from a feedstock comprising synthesis gas, in which a solid Fischer-Tropsch catalyst is used in an operating tri-phasic reaction section such that said catalyst is maintained in suspension in a liquid phase by the circulation of a gas phase from the bottom to the top of said reaction section, characterized in that the following steps are carried out so as to control and maintain the homogeneity of the concentration of catalyst particles in the reaction section: (a) for any i between 1 and n-1, where n is the number of pressure measuring points disposed along the longitudinal axis of the reactor and being at least 3, the differential pressures ΔPi are measured between two consecutive measurement points of pressure distant from Ahi and the pressure losses are calculated per meter ΔGi = ΔPi / Δhi, (b) for each pert e load per meter in said suspension catalyst in the liquid phase ΔGj, a value is calculated corresponding to the difference between two consecutive meter pressure losses divided by their mean (AGj + 1 - ΔGj) / ((ΔGj + 1 + ΔGj) / 2), (c) if at least one of the values calculated during step (b) is not less than 20%, at least one additive comprising at least one organosilicon polymer is injected at least at the bottom of the said reaction section.