Method for controlling fouling deposit formation in a liquid hydrocarbonaceous medium

A method of inhibiting fouling deposit formation in a liquid hydrocarbonaceous medium during heat treatment processing thereof, at a temperature of from about 200.degree. C.-550.degree. C., wherein, in the absence of such antifouling treatment, fouling deposits are normally formed as a separate phase within said liquid hydrocarbonaceous medium impeding process throughput and thermal transfer, said method comprising adding to said heat treated liquid hydrocarbonaceous medium, an antifouling amount of from about 0.5-10,000 parts by weight based upon one million parts of said hydrocarbonaceous medium of a reaction product of

• (a) polyalkenylsuccinic acid, C.sub.1 -C.sub.6 alkyl mono- or diester of said acid or polyalkenylsuccinic anhydride having the formula ##STR4## wherein R is an aliphatic alkenyl or alkyl moiety having between 50 and 200 carbon atoms,
• (b) a secondary aromatic amine having the formula ##STR5## wherein R.sub.2 and R.sub.3 are independently chosen from aryl and C.sub.1 -C.sub.18 alkaryl;
• and
• (c) a hindered alcohol having the formula ##STR6## wherein R.sub.4, R.sub.5 and R.sub.6 are independently chosen from H, CH.sub.2 OH, and OH;
• and wherein R.sub.7 is CH.sub.2 OH, CH.sub.2 OH substituted lower alkyl (C.sub.1 -C.sub.6), OH substituted lower alkyl (C.sub.1 -C.sub.6), CH.sub.2 OH and OH substituted lower alkyl (C.sub.1 -C.sub.6), CH.sub.2 --O--R.sub.8 or --O--R.sub.8 wherein R.sub.8 is lower alkyl (C.sub.1 -C.sub.6), OH substituted lower alkyl (C.sub.1 -C.sub.6) or CH.sub.2 OH substituted lower alkyl (C.sub.1 -C.sub.6).