Liquid fuel filters heavy fuels

Commercial operations are typically once-through at coil-outlet temperatures of 1050-1100°F. and pressures of 350 to 450 p.s.i.g., using 2 to 3 lb. of catalyst per barrel of feed. When processing heavy stocks, naphtha may be included in the feed to ensure complete vaporization, said to be essential for best results. The catalyst employed at Sarnia consists of natural and activated clay that has been previously used for contact treatment of lubricating oils. The catalyst is filtered from the liquid fuel oil, or tar, produced in the process and is normally discarded. Use of the catalyst permits continuous operations to be carried out at much more severe cracking conditions than could be otherwise employed. Erosion is... 

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