Patent ID: 7604730
Filing Date: 2009-10-20
Classification: C10G,Y10S

Abstract:
1. A process for reducing coking on the metal walls of a cracking reactor and a heat exchanger placed subsequent to the cracking reactor for cracking of a feedstock of hydrocarbons or of other organic compounds comprising: pretreating the metal walls coming into contact with the organic compounds to be cracked with a stream of steam with at least one non-sulphur-containing silicon compound which is hexamethyldisiloxane and at least one non-silicon-containing sulphur compound which is dimethyldisulfide at a temperature between 300 and 1100° C. for 0.5 to 12 hours, wherein the Si:S atomic ratio is between 2:1 and 1:2 and the concentration of silicon is less than 500 ppm; cracking the feedstock hydrocarbons or other organic compounds in the cracking reactor and heat exchanger; and decoking the cracking reactor and heat exchanger with a mixture of air and steam.