Abstract: A hydrocarbon conversion process comprises providing a hydrocarbon feedstock comprising an effluent fraction from a pyrolysis process, wherein the effluent fraction has an initial boiling point at atmospheric pressure of at least 177° C. and a final boiling point at atmospheric pressure of no more than 343° C. and comprises at least 0.5 wt. % of olefinic hydrogen atoms based on the total weight of hydrogen atoms in the effluent fraction. The hydrocarbon feedstock is hydroprocessed in at least one hydroprocessing zone in the presence of treatment gas comprising molecular hydrogen under catalytic hydroprocessing conditions to produce a hydroprocessed product comprising less than 0.5 wt. % of olefinic hydrogen atoms based on the total weight of hydrogen atoms in the hydroprocessed product. The hydroprocessing conditions comprise a temperature from 150 to 350° C. and a pressure from 500 to 1500 psig (3550 to 10445 kPa-a).