Use of morpholine neutralized phosphate and thiophosphate esters as ethylene furnace anti-coking antifoulants

Abstract From the Canadian patent

An improved method of reducing fouling and corrosion in ethylene cracking furnaces using petroleum feedstocks comprising treating the, petroleum feedstock with at least 10 ppm of a compound chosen from the group consisting of phosphite esters, phosphate esters thiophosphite esters, thiophosphate esters and mixtures thereof said esters being characterized, by the formulae: and, where X represents S or O, and R1 R2, and R3, are each independently selected from the group consisting of hydrogen, morpholine alkyl, aryl, alkaryl, cycloaklyl, alkenyl and aralkyl provided that at least one and not more than, two, of each of R1, R2 and R3 are morpholine.