Patent ID: 7794587
Filing Date: 2010-09-14
Classification: C10B

Abstract:
1. A method for altering the coke morphology in a delayed coking process of heavy oil in which the heavy oil is heated in a furnace and then passed to a delayed coking drum in which it is coked, the method comprising: a) contacting the heavy oil after the heating in the furnace and during the transition of the heavy oil from the furnace to the coking drum, with an oil dispersible or oil soluble additive to provide an additized heavy oil, which additive is represented by the chemical structure where AR is a polycyclic aromatic group having at least 2 fused rings, M is selected from the alkali and alkaline-earth metals and n is an integer from 1 to 5 when an alkali metal is used and from 2-10 when an alkaline earth metal is used, where the additive is added in an amount from 10 to 50,000 wppm based on the weight of the heavy oil and effective to increase the formation of substantially free-flowing coke during coking operations; and b) coking said additized heavy oil in the delayed coking drum at a coking temperature from 380° C. to 480° C. in the coking drum to produce a coke product the majority of which is free-flowing; and c) discharging free-flowing coke from the drum without cutting.