Alkylation process

Claim 1

IN A ALKYATAION PRAOCESS WHEREIN AN OLEFIN-BASED ALKYLATABLE MATERIAL AND ISOPARAFFIN ARE REACTED IN THE PRAESENCE OF AN ALKYLATION CATALYST IN A FIRST REACTION ZONE UNDER ALKYLATION CONDITIONS, AT LEAST A PART OF THE EFFLUENT FROM SAID FIRST RAEACTAION ZONE IS PASSED TO A SECOND REACTION ZONE IN THE ABSENCE OF AN ADDITIONAL AMOUNT OF SAID OLEFIN-BASED ALKYLATABLE MATERIAL, ALKYL ACID REACTION PRODUCTS IN THE OLEFIN-BASED ALKYLATABLE MATERIAL IN SAID CATALYST IN THE EFFLUENT FROM SAID FIRST REACTION ZONE ARE REACTED WITH ISOBUTANE IN SAID SECOND REACTION ZONE UNDER ALKYLATION CONDITIONS WITH THE FORMATION OF ALKYLATE AND RELEASED CATALYST, EFFLUENT FROM SAID SECOND REACTION ZONE IS PASSED TO A SEPARATING ZONE, AND SAID FIRST REACTION ZONE IS REFRIGERATED WITH AT LEAST A PARTA OF A MIXTURE OF REACTANTS AND REACTION PRODUCTS BY EVAPORATION OF LOW BOILING HYDROCARABON COMPONENTS THEREOF, THE IMPROVEMENT WHICH COMPRISES CONDENSING SAID EVAPORATED COMPONENTS FORMING A COLD CONDENSATE SAID EVAPORATED COMPONENTS ABOUT 35*F., ADMIXING SAID COLD CONDENSATE WITH SAID EFFLUENT FROM SAID FIRST REACTION ZONE AND PASSING SAID MIXTURE OF COLD CONDENSATE AND EFFLENT FROM SAID FIRST REACTION ZONE TO SAID SECOND REACTION ZONE AT A TEMPERATURE WITHIN THE RANGE OF 15 TO 55*F.