Process of inhibiting deposition of organic substances in heat exchangers and the like operating at elevated temperatures

Claim 1

IN A PROCESS OF REFINING A HYDROCARBON LIQUID AT A TEMPERATURE IN EXCESS OF ABOUT 225* F., WHEREIN HIGH TEMPERATURE CARBONACEOUS DEPOSITS ARE FORMED FROM SAID LIQUID IN PETROLEUM REFINERY APPARATUS OF THE TYPE INCLUDING FRACTIONATING TOWERS, STRIPPING COLUMNS, DEBUTANIZERS, DEPROPANIZERS, DEETHANIZERS, HEAT EXCHANGERS, REBOILERS, AND EXTRACTORS, THE METHOD OF OPERATION WHICH COMPRISES INCORPORATING WITH THE HYDROCARBON LIQUID SUPPLIED TO SAID APPARATUS AN ANTI-FOULING AMOUNT OF A SALT OF AN ORGANIC ALIPHATIC DICARBOXYLIC ACID CONTAINING AT LEAST 10 CARBON ATOMS IN A HYDROCARBON STRUCTURE AND A GLYOXALIDINE WHEREIN THE CARBON ATOM IN THE 2-POSITION IS LINKED TO A HIGHER ALIPHATIC HYDROCARBON GROUP CONTAINING AT LEAST 8 CARBON ATOMS, THE CARBON ATOM IN THE 4-POSITION IS LINKED TO A MEMBER FROM THE GROUP CONSISTING OF HYDROGEN AND LOWER ALIPHATIC HYDROCARBON GROUPS CONTAINING NOT MORE THAN 6 CARBON ATOMS, THE CARBON ATOM IN THE 5-POSITION IS LINKED TO A MEMBER FROM THE GROUP CONSISTING OF HYDROGEN AND LOWER ALIPHATIC HYDROCARBON GROUPS CONTAINING NOT MORE THAN 6 CARBON ATOMS, THERE BEING AT LEAST ONE HYDROGEN ATOM ON EACH OF THE CARBON ATOMS IN THE 4AND 5-POSITIONS, AND THE NITROGEN ATOM IN THE 1-POSITION IS LINKED TO A MEMBER FROM THE GROUP CONSISTING OF HYDROGEN AND LOWER ALIPHATIC GROUPS CONTAINING NOT MORE THAN 6 CARBON ATOMS, SAID LAST NAMED LOWER ALIPHATIC GROUPS BEING COMPOSED OF ATOMS FROM THE GROUP CONSISTING OF HYDROGEN, CARBON, NITROGEN AND OXYGEN.