Werkwijze en oven voor het kraken met stoom van een voeding die ethaan en/of propaan bevat.

摘要

A steam-cracking process with a very high degree of severity of a feedstock that comprises at least 20% by weight of hydrocarbons of the group that is formed by ethane and propane in which the feedstock that is diluted with water vapor is circulated in the radiation zone of a furnace, in at least one pipe with a length L>=14 m and a hydraulic diameter that is greater than or equal to 34 mm in the end portion of the pipe at least, is described under the following conditions of dwell time tau and furnace output temperature COT:120 ms<=tau<=2800 ms and 858° C.<=COT<=1025° C. to obtain a conversion of at least 77% of ethane of the feedstock if the feedstock contains ethane and/or a conversion of at least 96% of the propane of the feedstock if the feedstock contains propane, and to maintain this conversion for a cycle time that is greater than or equal to about 8 days.