Liquid-liquid heat exchange in low temperature polymerization

Claim 1

IN THE PROCESS FOR PREPARING BUTYL RUBBER BY COPOLYMERIZING A FEED STREAM, SAID FEED STREAM COMPRISING A MAJOR PROPORTION OF ISOBUTYLENE AND A MINOR PROPORTION OF ISOPRENE, AT A TEMPERATURE BELOW - 100*F. IN THE PRESENCE OF A LIQUID HYDROCARBON OF 4 TO 8 CARBON ATOMS, WHEREIN THE BUTYL RUBBER IS OBTAINED AS A SOLUTION IN SAID HYDROCARBON AND WHEREIN THE LIQUID FEED STREAM IS COOLED BY HEAT EXCHANGE WITH THE COLD SOLUTION OF BUTYL RUBBER THE IMPROVEMENT WHICH COMPRISES DIRECTLY CONTACTING THE SOLUTION OF BUTYL RUBBER AT A TEMPERATURE BELOW - 100* F. WITH A MOVING BODY OF A TRANSFER MEDIUM WHICH IS SOLID UNDER ONE SET OF CONDITIONS AND LIQUID UNDER ANOTHER AND WHICH TRANSFER MEDIUM IS CHOSEN FROM THE GROUP CONSISTING OF MERCURY AND CARBON DIOXIDE, WHEREBY SAID HEAT EXCHANGE MEDIUM IS CHILLED AND SOLIDIFIED AND SAID HEAT SOLUTION OF BUTYL RUBBER IS WARMED, SEPARATING SAID WARM SOLUTION OF BUTYL RUBBER FROM SAID CHILLED SOLID HEAT EXCHANGE MEDIUM, THEN CONTACTING SAID LIQUID FEED STREAM WITH SAID CHILLED SOLID HEAT EXCHANGE MEDIUM WHEREBY THE SAID LIQUID FEED STREAM IS CHILLED TO BELOW - 100*F. AND SAID SOLID HEAT EXCHANGE MEDIUM IS WARMED AND LIQUIFIED, SEPARATING SAID CHILLED LIQUID FEED STREAM FROM SAID LIQUIFIED HEAT EXCHANGE MEDIUM, AND RECYCLING THE SAID LIQUID HEAT EXCHANGE MEDIUM TO CONTACT WITH THE SAID COLD SOLUTION OF BUTYL RUBBER.