Abstract: Aromatic hydrocarbons are reacted with olefins using hydrogen fluoride as a catalyst in a process having two reaction zones and settling zones in sequence. The initial admixture of the aromatic hydrocarbons, olefins and catalyst is effected by passing all three materials directly into a centrifugal pump utilized to recirculate liquid hydrogen fluoride from a settling zone. The pump forms the first reaction zone.

Abstract: A more economical method of removing materials adsorbed on solid adsorbents used to treat hydrocarbon streams is presented. The method comprises removing a liquid hydrocarbon stream from a distillation column, vaporizing the liquid stream and superheating the vapors which are formed, passing the superheated vapor through the adsorbent and effecting the removal of the adsorbed material, and then returning the vapor to the fractionation column and utilizing the vapor as stripping media within the column. In the preferred embodiment, water is removed from alumina.