wherein benzene is alkylated with propylene is neutralized and rendered soluble in the alkylate by the addition to the alkylate stream of a primary amine application_number US 14473380 A description benzene for use as reactant in the process to which this invention relates is obtainable from several sources including the distillation of coal the dehydrogenation of naphthenic hydrocarbon fractions containing cyclohexane and the dehydrogenation and cyclization of aliphatic hydrocarbons containing 6 carbon atoms per molecule in straight chain arrangement such as normal hexane and the straight chain hexenes propylene utilized as alkylating agent in this process may be obtained from gases produced in the cracking of petroleum hydrocarbons by the dehydration of propyl or isopropyl alcohols and by any other suitable means which result in the formation of either substantially pure propylene or a hydrocarbon fraction containing substantial amounts of this olefinic hydrocarbon such fractions containing propylene also generally contain certain amounts of propane when they are derived from gases produced by cracking or dehydrogenation of hydrocarbons it has been found that propylene propane mixtures containing as little as 33 propylene when used in accordance with the conditions prescribed by the present invention give propylene conversions substantially equivalent to conversions obtained from fractions containing 95 propylene or more moreover the yield of mono.