C - Chemistry – Metallurgy – 10 – B
Patent
C - Chemistry, Metallurgy
10
B
196/80
C10B 55/00 (2006.01)
Patent
CA 1098066
ABSTRACT A process is described for the production of high purity, unusually high-crystalline texture petroleum coke from a low sulfur petroleum feedstock selected from the group consisting of virgin crude oil, distillation residuum, cracked residuum or mixtures. The process involves a preliminary heat treatment of the feedstock with removal of non- crystalline substances as pitch or coke, and the subsequent heating of a heavy oil fraction derived from the preliminary heating, following fractionation if necessary, to a coking temperature. The heated heavy oil fraction is then continuously introduced into a verticle, pressure coking-crystallizer which discharges gaseous light hydrocarbons through an upper outlet and progressively accumulates, in the lower portion of the coking-crystallizer, coke which is being formed. During operation the coking-crystallizer is treated with an upwardly passing, heated purging gas to prevent clogging. Once the crystallizer is full of coke crystals, the amount of purging gas injected is increased to expel remaining oily materials prior to removal of the coke from the crystallizer. The process permits production of a superior quality coke suitable for the production of graphite electrodes to be used in electric furnace steel-making under ultra high power operation. kam
261858
Hase Yoshihiko
Hayashi Kiyoshige
Kobayashi Nobuyuki
Nakaniwa Mikio
Yamamoto Minoru
Macrae & Co.
Maruzen Petrochemical Co. Ltd.
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