EFFECT OF PRESSURE ON DELAYED COKING OF ATHABASCA BITUMEN

摘要

Delayed coking, the most widely used coking process, was developed to minimize refinery yields of residual fuel oil by severe thermal cracking of feedstocks such as vacuum residue and thermal tars (Gary and Handwerk, 1984). The delayed coking process is particularly attractive when the green coke produced can be sold for anode or graphitic carbon manufacture or when there is no market for fuel oils, as in western Canada (Gray, 1994). The process uses long retention times in the liquid phases to convert the residue fraction of the feed to gases, distillates, and coke. The thermal cracking reactions produce olefinic species in the liquid product and the condensation reactions produce highly aromatic coke product that retains sulfur, nitrogen, and metals.