Coal tar pitch blend having low polycyclic aromatic hydrocarbon

Details Coal tar pitch blend having low polycyclic aromatic hydrocarbon Coal tar pitch blend having low polycyclic aromatic hydrocarbon

1995-08-10

1998-05-05

Myers, Helane

Mineral oils: processes and products

Products and compositions

Asphalts, tars, pitches and resins

208 23, 208 39, 208 41, 208 42, 208 44, C10C 7336

Patent

active

057469067

ABSTRACT:
A coal tar pitch/petroleum pitch blend is disclosed together with a method of making the same. In accordance with the invention, a crude coal tar material is selected according to specific properties including QI, specific gravity, water and ash content. A petroleum pitch material is also selected according to its softening point, QI, coking value and sulfur content. The coal tar pitch is distilled to a uncharacteristically high softening point which is then mixed with the petroleum pitch to a desired softening end point. The material retains significant QI and coking value characteristics of pure coal tar pitch particularly for use in Soderberg-type anodes for aluminum smelting as well as electric arc furnace electrodes. PAH emissions, and more specifically B(a)P equivalent emissions, are all reduced by approximately 40%.

REFERENCES:
patent: 5262043 (1993-11-01), Boenigk et al.
A.A. Mirtchi & L. Noel, "Polycyclic Aromatic Hydrocarbons (PAH) in Pitches used in the Aluminum Industry," Carbon '94 Extended Abstracts 1994.
E.R. McHenry, "Industrial Pitch Quality of the Future," Proceedings of the Fourth Australasian Aluminum Smelter Technology Workshop, Sydney, Australia, Oct. 25-30, 1992.
Pitch, Coal tar-petroleum (TSCA,NDSL ELXEC) Jun. 1995 TSCA.

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