Method of charging reactants through concentric feed tubes

Claim 1

IN A PROCESS OF SLKYLATION OF ISOPARAFFINIC HYDROCARBONS WITH OLEFINIC HYDROCARBONS IN THE PRESENCE OF AN ACID CATALYST AT A CONTROLLED TEMPERATURE WHEREIN A BLEND OF ALKYLATE, EXCESS ACID, EXCESS ISOPARAFFINIC HYDROCARBONS AND THE LINE ARE FLOWED IN A REACTION VESSEL IN A CLOSED CYCLIC STREAM AXIALLY OF A CIRCULATING TUBE THEREIN, THE REAM PASSING THROUGH SAID TUBE, THEN AROUND ITS EXTERIOR SURFACE AT A FLOW RATE GREATER THAN THE FLOW RATE OF THE ALKYLATION FEED COMPONENTS INTO THE VESSEL, A MIXING STEP PROVIDED IN SAID STREAM IN SAID VESSEL, THE BLEND BEING WITHDRAWN FROM THE CLOSED, CYCLIC FLOWING STREAM AT A RATE LESS THAN THE FLOW RATE OF THE CLOSED, CYCLIC FLOWING STREAM, THE OLEFINIC HYDROCARBONS BEING OPTIMALLY RRETAINED AT A TEMPERATURE LOWER THAN THAT OF THE CLOSED, CYCLIC FLOWING STREAM UNTIL THEY ARE DISPERSED THEREIN AND MIXED WITH THE ISOPARAFFINIC HYDROCARBONS AND ACID, THE IMPROVEMENT WHICH COMPRISES FEEDING CHILLED ISOBUTANE AND OLEFINIC HYDROCARBONS INTO THE BLEND WITH THE CHILLED ISOBUTANE BEING FED CONCENTRIC TO THE OLEFINIC HYDROCARBONS UNTIL THE ISOBBUTANE AND OLEFINIC HYDROCARBONS ARE DISPERSED IN SAID STREAM, SAID OSOBUTANE AND OLEFINIC HYDROCARBONS PASSED INTO SAID STREAM IMMEDIATELY PRIOR TO SAID MIXING STEP.