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The Insoluble matter of coal tar. II. Preliminary work on free carbon

✍ Scribed by Green, S. J. ;Thakur, B.

Publisher
Wiley (John Wiley & Sons)
Year
1948
Weight
476 KB
Volume
67
Category
Article
ISSN
0368-4075

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✦ Synopsis

Abstract

The effect of previous conditions of preparation and storage of coal tars on the amount of fre carbon determined by insolubility in toluene has been investigated. Pressure is shown to have little effect but at atmospheric pressure there is progressive increase in free carbon. With rising temperature two effects occur, a reversible increased solubility and an irreversible increase in free carbon which predominates at higher temperatures. The Chemical nature of free carbon is examined and C1 and C2 are distinguished by their chemical and physical properties. A comparison is made of free carbon obtained by centriguging with that obtained by precipitation.

In undertaking a study of the occurrence and nature of I “free carbon” in coal tars it was considered desirable first to investigate the effect of time, temperature, pressure, etc., on the quantitative yield of free carbon, and then to consider the general chemical nature of the materials.

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