INJECTION OF ANTIFOULANTS INTO THERMAL CRACKING REACTORS

摘要

A liquid tin-containing antifoulant composition is injected into a metal-walled thermal cracking reactor tuba, concurrently with the injection of a gaseous stream (preferably a steam-diluted C2-C4 alkane stream), through a nozzle of an injection quill which is positioned in the center region of the reactor tube substantially parallel to the flow of the gaseous stream. A liquid tin-containing antifoulant is injected into a metal-walled thermal cracking reactor tube through a nozzle of an injection quill at a temperature of about 1000-1300.degree.F while a gaseous stream (preferably a steam-diluted C2-C4 alkane stream) flows through the reactor tube, followed by raising the temperature to about 1400-1800.degree.F. Preferably, the metal walls of the reactor tube are treated with steam after the antifoulant injection at about 1000-1300.degree.F but before the antifoulant injection at about 1400-1800.degree.F.