Patent ID: 7550515

Claim:
A process for the make-up of a catalyst in a reactor suitable for reactions which take place in three-phase systems according to the Fischer-Tropsch technique, to compensate losses in activity and material during the overall production cycle, which comprises: a) incorporating the catalyst, previously reduced, in a matrix of paraffinic waxes, solid at room temperature; b) melting and collecting the paraffinic matrix in a vessel, maintained at a high temperature, together with a diluent which is miscible with the molten paraffinic matrix and which is in liquid form both under the conditions present in the vessel and at room temperature, wherein a stream of a first inert gas is distributed in said vessel from the bottom so as to obtain a sufficiently homogeneous suspension; c) pressurizing the vessel in which the complete melting of the paraffinic matrix has been effected at a pressure higher than that of a conditioning reactor maintaining the system fluidized by the continuous introduction of said first inert gas from the bottom of said vessel; d) transferring, due to the pressure change, a diluted solution from the vessel under pressure to the conditioning reactor, initially empty, maintained at a temperature higher than or equal to that present in the vessel and flushed in turn from the bottom with a second inert gas; e) regulating the temperature and pressure in the conditioning reactor at values ranging from 200-230° C. and 0.5-1.5 MPa; f) gradually substituting the second inert gas with a synthesis gas up to a concentration of inert gas ranging from 5 to 50% by volume and maintaining a partial water pressure (co-product of the Fischer-Tropsch synthesis reaction) lower than 1.0 MPa; g) maintaining the conditions of point (f) for 24-72 hours; h) gradually increasing the pressure inside the conditioning reactor to a value higher than the pressure of a main reactor; i) gradually reducing the concentration of said second inert gas to zero; j) gradually increasing the reaction temperature until reaching values ranging from 200 to 350° C.; k) after completing the conditioning phase, transferring the suspension from the conditioning reaction vessel to the main reactor, which is running under normal operating conditions, by means of a pressure change.