and pyrrole nitrogen compounds these reactions form higher molecular weight condensation polymers which will eventually deposit on equipment surfaces and foul the fluid catalytic cracking unit the compound of the present invention can also be effectively used with other antifoulants such as polybutynyl thiophosphoric acid ester and n n 39 disalicylidene 1 2 cyclohexanediamine the treatment dosage range for the aminoethyl piperazine compound clearly depends upon the severity of the fouling problem the condensation polymers being formed and the strength of the concentrate used for this reason the success of the treatment is totally dependent upon the use of a sufficient amount for the purpose of the aminoethyl piperazine broadly speaking the aminoethyl piperazine can be added in a range from about 5 parts to about 5000 parts per million parts of hydrocarbon sought to be treated preferably from about 15 parts to about 200 parts per million parts of hydrocarbon is employed the aminoethyl piperazine may be added as a concentrate or as a solution using a suitable carrier solvent which is compatible with the aminoethyl piperazine and the hydrocarbon stream suitable carrier solvents include heavy aromatic naphtha and xylene a commercial mixture of o m and p isomers in order to more clearly illustrate this invention the data set.