Improved process for delayed cooking of coking feedstocks

摘要

A process for producing coke from a combined feed. The combined feed is initially provided as a first portion (16) which comprises easily cokable components and a second portion (25) which is essentially free of easily cokable components. The first portion is heated (18,19) to a temperature lower than that normally employed by a coking heater in a delayed coking process. The second portion is heated (20,21) to a temperature at which a combination of the first and second portion provides combined feed at coking temperatures. The combined feed is then subjected to coking conditions (24).;The first portion, in one embodiment, may be comprised of a fresh feed (10˝) and the second portion may be comprised of a coker recycle (46). In another alternative, a fresh feed (10′) and a coker recycle (38) are combined and fractionated to produce the first portion (30) and the second portion (32). The first portion may include components which boil above a temperature of about 900°F, and the second portion may be essentially free of easily cokable components.