Abstract: The C.sub.2 to C.sub.5 and heavier acetylenes and dienes in a thermally cracked feed stream are hydrogenated without significantly hydrogenating the C.sub.2 and C.sub.3 olefins. Additionally, the C.sub.4 and heavier olefins may be hydrogenated. Specifically, the cracked gas feed in an olefin plant is hydrogenated in a distillation reaction column containing a hydrogenation catalyst without the necessity of separating the hydrogen out of the feed and without any significant hydrogenation of the ethylene and propylene. A combined reaction-fractionation step known as catalytic distillation hydrogenation is used to simultaneously carry out the reactions and separations while maintaining the hydrogenation conditions such that the ethylene and propylene remain substantially un-hydrogenated and essentially all of the other C.sub.2 and heavier unsaturated hydrocarbons are hydrogenated. Any unreacted hydrogen can be separated by a membrane and then reacted with separated C.sub.

Abstract: A trailer and hitch apparatus for a bicycle includes a trailer assembly and a hitch assembly. The trailer assembly includes a front section, an extension section which is removably attached to the front section, a first trailer module which is removably attached to the extension module and a second trailer module which is removably attached to the first trailer module. The hitch assembly includes a horizontal frame having a front end adapted to be removably attached to the rear wheel fork of the bicycle near the top end. The hitch assembly also includes a pair of legs which extend downwardly from the rear end of the horizontal frame and which are adapted to be removably attached to the rear wheel fork of the bicycle near the bottom.