Patent ID: 7297833
Filing Date: 2007-11-20
Classification: C10G

Abstract:
1. A process for cracking a contaminated light hydrocarbon feedstock, said contaminated light hydrocarbon feedstock comprising non-volatile components and/or coke precursors and said process comprising: a. mixing a heavy hydrocarbon feedstock with said contaminated light hydrocarbon feedstock to form a contaminated hydrocarbon feedstock blend; b. heating said contaminated hydrocarbon feedstock blend; c. feeding the contaminated hydrocarbon feedstock blend to a flash/separation vessel; d. separating the contaminated hydrocarbon feedstock blend into a vapor phase and a liquid phase, said liquid phase being rich in non-volatile components and/or coke precursors and said vapor phase being substantially depleted of non-volatile components and/or coke precursors; e. removing the vapor phase from the flash/separation vessel; and f. cracking the 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 wherein the volume of said heavy hydrocarbon feedstock is sufficient to reduce the coking rate in and upstream of said flash/separation vessel as compared to using a feedstock comprising only the contaminated light hydrocarbon feedstock at the same operating conditions.