Characterization of material samples for coking behavior of HP40 material both coated and uncoated using naphtha and ethane feedstock

摘要

The active surfaces of commercially available high temperature corrosion resistant materials can be efficiently characterized using reference reactions such as pyrolysis or metal dusting. The importance of such characterization methods is by far more conclusive than conventional surface analysis. This paper presents experimental results for the pyrolysis of naphtha and ethane on the surfaces of a surface modified HP 40 material (Aleroplex of Alon Surface Technologies, Inc.) com pared with a conventional HP 40 material. The results show, that this coating decreases the coke formation in the radiant zone of a steam cracker up to 90% using ethane and up to 80% using naphtha as feedstock. This result is partially surprising, because naphtha contains already traces of sulfur which by itself inhibit the reaction of coke formation on material surfaces. A second positive effect besides reduction of coke formation is the almost complete suppression of carbon monoxide formation, especially for ethane.