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Research And Development On Advanced Graphite Materials. Volume XXXVI - Studies Of The Quality Of Petroleum Coke From A Pilot Scale Delayed Coker

Report Number: WADD TR 61-72 Volume 36
Author: Stout, C. F.
Author: Biehl, J. A.
Author: Janes, M.
Corporate Author: Advanced Materials Laboratory, Union Carbide Company
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-08
Pages: 122
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0607763

This report describes the design, construction, and operation of an experimental delayed coking unit for the conversion of petroleum residues to coke for use as the filler component in graphite for aerospace applications. The effect of changes in operating conditions of the experimental coker, e.g., time-temperature, pressure, and recycle ratio was investigated with respect to the physical properties of graphitized extruded and molded samples. Four basic charge stocks were studied: vacuum residuum, slurry (decant) oil, thermal tar, and a low sulfur thermal tar. Variations in raw coke bulk density are reported; in addition, data concerning kerosene density, ash, and sulfur content of the 1000°C calcined cokes are also included. Changes in bulk density, weight, and volume of the extruded and molded test samples resulting from the processing steps of baking and graphitizing are reported. The CTE (coefficient of thermal expansion), specific resistance, and flexural strength of the graphitized molded plugs in both the with- and across-grain directions are reported as well as the same properties for the with-grain direction of extruded rods.

High coke yields from cracked feed stocks were obtained by operating at high recycle ratios and higher-than-normal drum pressures. Thermally and catalytically-cracked charge stocks were coked to produce cokes yielding fabricated graphites exhibiting low CTE. Super-heated steam introduced into the hot oil stream between the furnace and the coking drum resulted in a marked effect on the coke produced from vacuum-residuum; the graphite formed using this coke as filler material was higher in CTE and more isotropic than conventional graphites, making it useful as a substrate for coatings.

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