Title: Manufacture of low-sulfur needle coke

Abstract: High grade, low-sulfur needle coke is produced from heavy high-sulfur aromatic mineral oil feedstocks by a sequence of (1) fractionating the feedstock into a minor heavy fraction, and a major lighter fraction, (2) subjecting the lighter fraction to mild hydrofining, (3) blending the heavy fraction separated in step (1) with the heavy fraction of hydrofined oil from step (2), (4) subjecting the resulting blend to delayed thermal coking, and preferably (5) recycling to the coking step heavy coker gas oil recovered from the coker effluent. If desired, the aromaticity of the heavy hydrofined oil from step (2) can be increased by subjecting the same to thermal cracking prior to step (3).

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Inventors: Skripek, Milan (Fullerton, CA, US)
Duir, John H. (Yorba Linda, CA, US)

Application Number: 769421
Filing Date: 1977-02-17
Publication_date: 1978-02-21
Assignee: Union Oil Company of California (Los Angeles, CA)
Primary Class(es): 208/93 208/50, 208/92, 208/131
Other Classes:
US Patent Ref:

2775549	Dec, 1956	Shea	208/131.
3480540	Nov, 1969	Eng et al.	208/93.
3817853	Jun, 1974	Folkins	208/50.
3891538	Jun, 1975	Walkey	208/50.
3902991	Sep, 1975	Christensen et al.	208/50.
4005006	Jan, 1977	Montagna	208/89.

Other Refs:
Primary Examiner: Meros, Edward J.
Assistant Examiner:
Attorney: Henderson; Lannas S., Hartman; Richard C., Sandford; Dean