Use of liquefied propane and butane or butane recycle to control heat of reaction of converting olefins to gasoline and distillate

Claim 1

A process for producing a hydrocarbon fuel boiling within the range of gasoline and distillate comprising (a) contacting a C 2 -C 5 olefin, mixtures thereof or mixtures thereof with paraffins having from 1 to 5 carbon atoms with a crystalline zeolite selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-35 and ZSM-38 zeolites thereby producing a product stream comprising a liquid phase and a vapor phase; (b) separating said product stream of (a) into a liquid phase and a vapor phase; (c) fractionating said liquid phase of (b) into a desired gasoline fraction; (d) passing the vapor phase of (b) through a cooling zone thereby condensing at least a portion of the propane and butene product to a liquid and forming a two-phase vapor and liquid mixture; (e) separating the two-phase mixture of (d) into a liquid phase and a vapor phase; (f) flowing said liquid phase of (e) in a heat exchange relationship with the vapor phase of (b); (g) fractionating at least a portion of said liquid phase of (e) into a desired gasoline fraction; and (h) recycling a portion of said liquid phase of (e) into contact with said zeolite of (a).