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Project: Inhibition of coke formation during steam cracking.

project duration
01-OCT-00 – 30-SEP-05
abstract
Thermal cracking units are typically constructed of heat resistant Fe-Ni-Cr alloys. An inherent problem associated with these alloys is their tendency to promote coke deposition. The carbon deposition during steam cracking is a complex phenomenon, mainly consisting of catalytic coke formation and radical growth of coke from existing coke layers onwards, although gas phase coking cannot be excluded for heavy feeds. Coke deposition in thermal cracking units is known to depend on the chemical composition of the alloy and mainly in particular on its surface composition. The coking potential of the alloy can be modified by pretreatment e.g. oxidation, reduction, sulfidation, pretreatment with an inhibitor and/or by continuously adding coke inhibitors to the feed. The aim of this project is to identify and to optimize the use of coke inhibitors.