Patent ID: 8496805

Claim:
A delayed coking method comprising: (a) heating a petroleum resid feed derived from a heavy crude having a gravity of 5 to 9° API in a first heating zone, to a temperature at which the resid is a pumpable liquid; (b) heating the resid further in a furnace to a coking temperature of up to 520° C.; (c) conducting the heated resid from the furnace in a transfer line to a delayed coking drum; (d) injecting a volatile liquid comprising water and a naphtha having an end point up to 150° C. into the heated resid in the transfer line in an amount from 0.5 to 2 v/v percent volatile liquid to feed; (e) subjecting the heated resid in the coking drum to coking at a coking temperature up to 520° C. and at 100 to 550 kPag coking drum pressure and removing the vapor products produced in the coking as overhead and forming a quenchable coke product as a mass in the drum (f) quenching the coke mass in the drum to produce a solid coke product; (g) removing the quenched coke product from the drum.