Patent ID: 6908543

Claim:
A process for hydroconversion of a Fischer-Tropsch hydrocarbon stream including oxygenates and hydrocarbon unsaturates with reduction in formation of heavy molecular weight products during heating comprising at least one preheating step prior to a heating step for achieving hydroconversion reaction temperature, the process comprising: a) adding a first hydrogen-containing gas to the hydrocarbon stream prior to the at least one preheating step and not under hydroconversion conditions, wherein the first hydrogen-containing gas is added in an amount less than about 100 SCFB and wherein the first hydrogen-containing gas is sufficient to reduce the amount of heavy molecular weight products formed during the preheating as compared to a heated hydrocarbon stream without added hydrogen, to form a mixed stream; b) preheating the mixed stream; c) adding a second hydrogen-containing gas to the preheated mixed stream sufficient to effect hydroconversion of the mixed stream, to form a hydroconversion feed stream; d) heating the hydroconversion feed stream to reaction temperature; and e) hydroconverting the hydroconversion feed stream.