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

The inorganic constituents of coals are bricfly reviewed and their subsequent history during combustion and carbonization is considered. The cxamination is reported of the zinc‐pyridine complex obtained from a free carbon sample by extraction with water. Examination for other elements is described and the presence of lead, iron, cobalt, manganese and others indicated. The form in which these elements are present is discussed.

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The insoluble matter of coal tar. VII. Dilution of tars

Green¹,

Olden²

1951

J. Appl. Chem.

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Previous application of surface‐tension rules to dilution of coal tars is criticized and it is considered that the surface tension of the mixture of diluent with the oils of the tar must be considered rather than the surface tension of the diluent alone. Maximum insolubles in a tar‐diluent system occur at lower ratios of diluent to tar for both horizontal‐ and vertical‐retort tars. The relation of maximum insolubles to the surface tension of the diluents has been examined and generally it is shown that diluents with surface tensions above that of the tar behave quite differently from those of lower surface tension. The results are interpreted to mean that flocculation and precipitation, followed by solution or redis‐persion, occur when diluent of surface tension lower than the tar is added in increasing amounts.

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

Abstract: An account is given of an investigition carried out at the Chemical Research Laboratory, Teddington, on the fibre-forming pc;yester, polyethylene terephthalate which was recently announced by the Calico Printers' Assodotion,ind I m p e e Chermcal Industries under

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The insoluble matter of coal tar. VII. Dilution of tars

The insoluble matter of coal tar. VII. Dilution of tars

The insoluble matter of coal tar III. Some inorganic constitutents of free carbon

The insoluble matter of coal tar. VII. Dilution of tars

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