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

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

doi:10.1002/jctb.5000671204

Cited by 4 publications

References 6 publications

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

Vahrman

1952

J. Appl. Chem.

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The constitution and structure of coal‐tar pitch

Wood

Phillips

1955

J. Appl. Chem.

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Five commercial coal‐tar pitches, an air‐blown pitch and a straight‐run bitumen have been fractionated by solvent extraction and precipitation, and the molecular weights and elementary composition of the products have been determined. All five normal pitches are similar as regards the lower end of their molecular‐weight‐distribution curves, 50% by weight ranging from 150 to 350. The distributions of the upper 50% are also continuous, but the top molecular weight varies from 1400 in the low‐temperature carbonization pitch to about double that figure in the horizontal‐retort pitch. The molecular weights of bitumen and air‐blown pitch extend to above 5000. The coke‐oven pitch fractions all consist predominantly of condensed aromatic molecules, mainly hydrocarbon in nature, exhibiting only a limited degree of methyl substitution. The horizontal‐retort pitch is slightly less aromatic. The vertical‐retort pitch, though containing low‐molecular‐weight paraffins, increases in aromaticity with increasing molecular weight. The low‐temperature carbonization pitch fractions all have lower carbon/hydrogen ratios than those of the other pitches. Ultracentrifuging of tars and their solutions has failed to reveal any significant amount of disperse phase. Pitch is considered to be a supercooled liquid whose physical properties can be adequately explained without recourse to a colloid theory.

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Die Untersuchung des Steinkohlenteerpeches. I

Lißner

Schäfer

1955

J. Prakt. Chem.

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InhaltsubersichtZwickauer Steinkohlenteerpech wurde nach der Methode von BROCHE und WEDEL-MANN aufgetrennt und die Loslichkeit der einzelnen Fraktionen in verschiedenen organischen Losungsmitteln bestimmt. Der in Benzin bzw. Benzol losliche Anteil konnte mit Hilfe der Fallungsmethode, der Papier-und Saulenchromatographie in einzelne Fraktionen zerlegt werden. Von den einzelnen Pechbestandteilen wurden auch die basischen und sauren Stoffe bestimmt.

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

Cited by 4 publications

References 6 publications

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

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

The constitution and structure of coal‐tar pitch

Die Untersuchung des Steinkohlenteerpeches. I

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