Community Research and Development Information Service - CORDIS

Abstract

It has been demonstrated that the content of known carcinogenic polynuclear aromatic hydrocarbons (PAH) in coal-tar pitches may be reduced to levels which comply with existing and/or proposed environmental legislation, typically by distillation at low pressures, and preferably using a form of thin-film evaporation apparatus. However, the immediate products of such distillations usually have very high softening points, typically above 200ºC, and are unsuitable for direct utilization in conventional commercial carbon manufacturing processes as a result of the need for very high mixing temperatures. Advantage has been taken of the of a low-PAH coal-tar pitch, supplied in powder form, which has a softening point above 200ºC. Methods were examined which might allow mixing and forming of the hard pitch and a petroleum coke aggregate blend either at room temperature or at conventional processing temperature, and hot-pressing or sintering procedures in which mixtures of the hard pitch and petroleum coke aggregate were formed at or above the softening temperature of the pitch. All the formed products were baked to give carbons which were evaluated for the major properties of density, electrical resistivity and strength. A comparison was also made between the volatiles evolved during the baking of products made with the low-PAH pitch and those made with a conventional coal-tar binder pitch.

Additional information

Authors: TIS (GB),
Bibliographic Reference: EUR 18584 EN (1999) 42pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-2261-3
Record Number: 199911425 / Last updated on: 1999-10-01
Category: PUBLICATION
Original language: en
Available languages: en
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