Patent ID: 7235705
Filing Date: 2007-06-26
Classification: C10G

Abstract:
1. A process for cracking a hydrocarbon feedstock containing resid, said process comprising: (a) heating said hydrocarbon feedstock; (b) mixing the heated hydrocarbon feedstock with steam to form a mixture stream; (c) introducing the mixture stream to a flash/separation apparatus to form i) a vapor phase at its dew point which partially cracks causing a temperature decrease and partial condensation of said vapor phase in the absence of added heat, and ii) a liquid phase; (d) reduciug or eliminating said partial condensation by adding a heated vaporous diluent to said flash/separation apparatus to an extent sufficient to at least partially compensate for said temperature decrease and to dilute and superheat said vapor phase; (e) removing the vapor phase as overhead and said liquid phase as bottoms from said flash/separation apparatus; (f) indirectly heating the vapor phase; (g) cracking the heated vapor phase in a radiant section of a pyrolysis furnace to produce an effluent comprising olefins, said pyrolysis furnace comprising a radiant section and a convection section; and (h) quenching the effluent and recovering cracked product therefrom.