Patent ID: 8721872

Claim:
A method for thermally cracking a hydrocarbonaceous feedstock comprising the steps of: (i) preheating the hydrocarbonaceous feedstock in a liquid cracking furnace to form a preheated stream, wherein the hydrocarbonceous feed stock comprises at least one hydrocarbonaceous material, at least one hydrocarbonaceous material containing at least one organic acid species, wherein the preheated stream comprises a first gaseous phase and a first liquid phase, (ii) passing the preheated stream from the liquid cracking furnace to the vaporization furnace; (iii) separating the first gaseous phase and the first liquid phase in a upper vaporization zone of the vaporization furnace; (iv) mixing the first liquid phase with steam that is preheated in the liquid cracking furnace to produce a second gaseous phase and a second liquid phase; (v) combining the first gaseous phase and the second gaseous phase to produce a third gaseous phase; (vi) preheating the third gaseous phase in a convection pre-heat sub-zone of the liquid cracking furnace; and (vii) thermally cracking the preheated third gaseous phase to form a cracked product wherein the chemical composition of the first gaseous phase is different from the chemical composition of the second gaseous phase, and wherein the first liquid phase is different from the second liquid phase.