FORMATION OF COKE DEPOSITS AND COKE INHIBITION METHODS DURING STEAM CRACKING.

Steam cracking belongs to the most important processes in petrochemical industry. Steam cracking is accompanied always by formation of coke deposits on inner walls of steam cracking tubes and of TLE. Coke formation significantly and negatively influences economic and energetic balance of the process. Different ways to minimize the coke deposition in steam cracking units are searched together with detailed understanding of coke formation mechanisms. The amount and character of created coke depends on operating parameters, feedstock type, on the reactor and TLE material, their surface modifications and also on addition of inhibitors. Summary of information about coke formation during steam cracking and of coke inhibition methods is given. [ABSTRACT FROM AUTHOR]