Patent ID: 7303664
Filing Date: 2007-12-04
Classification: C10B,C10G

Abstract:
1. A delayed coking process comprising: (a) heating a petroleum resid in a first heating zone, to a temperature below coking temperatures but to a temperature wherein the resid is a pumpable liquid; (b) conducting the 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 operating at a temperature between about 410° C. and 475° C. wherein vapor products are collected overhead and a coke product is formed; (d) introducing into said resid at least one metals-containing additive in an amount ranging from 100 to 3000 wppm (based on the total weight of the metal in the additive to the weight of the resid feed) where said metals-containing additive is effective for the formation of substantially free-flowing shot coke, and wherein said metals-containing additive is introduced into said resid at a point upstream of the second heating zone, upstream of said coking zone, or both; and (e) removing a substantially free-flowing shot coke from the coking zone comprising discrete micro-domains having an average size of about 0.5 to 10 μm.