Patent ID: 7658838

Claim:
A delayed coking process comprising: (a) heating a petroleum resid feed in a first heating zone, to a temperature below coking temperatures but to a temperature wherein the resid is a pumpable liquid; (b) conducting said heated resid to a second heating zone wherein it is heated to coking temperatures; (c) conducting said heated resid from said second heating zone to a coking zone wherein vapor products are collected overhead and a substantially free-flowing shot coke product is formed; (d) introducing into said resid from about 300 to about 3,000 wppm of at least one polymeric additive selected from polyoxyethylene, polyoxypropylene, polyoxyethylene-polyoxypropylene copolymer, ethylene diamine tetra alkoxylated alcohol of polyoxyethylene alcohol, ethylene diamine tetra alkoxylated alcohol of polyoxypropylene alcohol, ethylene diamine tetra alkoxylated alcohol of polyoxypropylene-polyoxyethylene alcohols and mixtures thereof and having a molecular weight from about 1,000 to about 30,000, that is effective for the formation of substantially free-flowing shot coke, wherein said polymeric additive is introduced into said resid at a point upstream of the second heating zone, between said second heating zone and said coking zone, or both.