Integrated supercritical water and steam cracking process

A method for producing a supercritical water (SCW)-treated product, the method comprising the steps of:

• introducing a mixed stream comprising hot oil and supercritical water to a convection section of a furnace, where conversion reactions occur in the convection section, wherein the furnace comprises a convection section and a radiation section;
• upgrading the mixed stream in the convection section of the furnace to produce a convection upgraded stream at a temperature of between the critical temperature of water and 500° C.;
• introducing the convection upgraded stream to a supercritical reactor, where the supercritical reactor is maintained at a temperature between 380° C. and 450° C. and a pressure between 23 MPa and 35 MPa, wherein one or more conversion reactions occur in the supercritical reactor;
• upgrading the convection upgraded stream in the supercritical reactor to produce a reactor effluent;
• introducing the reactor effluent to a post-reaction stage to produce the SCW-treated product, wherein the SCW-treated product comprises an increased paraffin concentration as compared to a crude oil stream, wherein the SCW-treated product comprises an amount of water;
• introducing the SCW-treated product to the convection section of the furnace;
• mixing a first fraction of components of the SCW-treated product with the mixed stream such that some components of the SCW-treated product are in the convection upgraded stream;
• flowing a second fraction of components of the SCW-treated product to the radiation section of the furnace;
• mixing the second fraction of components of the SCW-treated product that flow to the radiation section of the furnace with diluents in the radiation section of the furnace;
• upgrading the second fraction of components of the SCW-treated product in the radiation section of the furnace to produce a furnace effluent, where the second fraction of components of the SCW-treated product are subjected to radical-mediated reactions;
• and
• withdrawing the furnace effluent from the radiation section of the furnace.