The insoluble matter of coal tar. V. Coal tar resins

Green, S. J.; Mukherji, S. M.

doi:10.1002/jctb.5000680105

Cited by 3 publications

References 28 publications

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The insoluble matter of coal tar. VI. Oxidation of free carbon

Green

Thakur

1950

J. Chem. Technol. Biotechnol.

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\Vork on the osidation of carbonaceous materials with alkalinc potassium permanganate is briefly outlincd and the experimental step-wise osidation of free carbon is described. The course of reaction as interpreted from rhesc results is indicated. Bulk OXid3tion of free carbon and the nature of the products are reported. In the steam-volatile fraction, formic, acetic and butyric acids have been identified. The water-soluble non-volatile acids and their methyl esters have been fractionated. Oxalic, succinic, phrhalic, tercphthalic and mellitic acids have been identified in the oxidation products. The major portion of the acids, however, was found to be more complex, probably having polynuclcar structures.Oxidation of C , and C, shows that C, is more highly condensed than Cz and resembles graphite and coke in its properties.

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The insoluble matter of coal tar. VI. Oxidation of free carbon

Green

Thakur

1950

J. Chem. Technol. Biotechnol.

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Some aspects of the chemistry of coal tars. I. Chemical nature

Vahrman

1952

J. Appl. Chem.

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The chemical, and to a more limited extent the physical,, properties of coal tars of different origins are revicwed to serve as a background to the work to be described in later parts, mainly on tars derivcd from down-jet combustion of bituminous coal. To the same end, the chemistry of the amorphous constituents of coal tars is separately considered, and a classification on the basis of known data is given.The experimental work to be described in this series of papers is concerned with, but not entirely confined to, the chemistry of tars derived from the down-jet combustion of coal. It is desirable first to summarize and re-evaluate those portions of the literature bearing on the work undertaken.tAlthough the general characteristics of low-temperature and high-temperature tars are well known, it is not generally recognized that low-temperature tars can be subdivided according to the degree of decomposition suffered by the tar, so that only by broadly surveying the whole field can an attempt be made to construct a scale to serve as a measure of the ' primariness ' of any particular tar. One of the main obstacles in obtaining a clearer view of the interrelationships between tars and between specific tar-components is the presence of amorphous materials of unknown chemical structures, which are particularly plentiful in low-temperature tars. A critical examination of the literature was thought to be of value here in reducing the confusion that exists between amorphous materials of differing structures and origins. This was considered important not only in the further study of the amorphous constituents themselves, but also in attempting to relate the structures of the more primary of them to the chemical constitution of coal. Thus it was realized quite early in the work on down-jet tar that it was of a high degree of ' primariness ' ; this determined, to a considerable extent, the course of the subsequent investigations.

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Erzeugnisse aus Steinkohlenteer

Franck

Collin

1968

Steinkohlenteer

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The insoluble matter of coal tar. V. Coal tar resins

Cited by 3 publications

References 28 publications

The insoluble matter of coal tar. VI. Oxidation of free carbon

The insoluble matter of coal tar. VI. Oxidation of free carbon

Some aspects of the chemistry of coal tars. I. Chemical nature

Erzeugnisse aus Steinkohlenteer

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