Patent ID: 7645375
Filing Date: 2010-01-12
Classification: C10B

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 petroleum resid is a pumpable liquid; (b) conducting said heated petroleum resid to a second heating zone wherein it is heated to coking temperatures; (c) conducting said heated petroleum resid from said second heating zone to a coking zone wherein vapor products are collected overhead and a coke product is formed; (d) introducing into said resid at least one low molecular weight aromatic additive that is effective for the formation of substantially free-flowing coke in an amount from about 10 to 5,000 ppmw based on the weight of the petroleum resid, wherein said additive is introduced into said heated petroleum resid at a point upstream of the second heating zone, upstream of said coking zone, or both and wherein said additive is comprised of one or two homonuclear or heteronuclear aromatic rings having from one to four alkyl substituents, which alkyl substituents contain from about one to eight carbon atoms.