Coal Tar And Ammonia Part 2 Coal Tar

Author : Georg Lunge
Publisher : Forgotten Books
ISBN 13 : 9781332006939
Total Pages : 532 pages
Book Rating : 4.0/5 (69 download)

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Download or read book Coal-Tar and Ammonia, Vol. 2 (Classic Reprint) written by Georg Lunge and published by Forgotten Books. This book was released on 2015-07-27 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Coal-Tar and Ammonia, Vol. 2 It need hardly be said that the word "pitch" denotes many substances which have nothing to do with coal-tar, such as pitch from petroleum, wood, natural bitumen, and some products obtained in the manufacture of stearine, wool, etc. Donath and Margosches (Chem. Ind., 1904, p. 221) discourse on these various descriptions of pitch and asphalt and their distinctions from coal-tar pitch. In this book we treat exclusively of the latter. The nature of coal-tar pitch is very little elucidated up to the present. We shall presently quote statements on the ultimate analysis of pitch, and on the amount extracted by various solvents, but this evidently does not lead to a knowledge of the chemical compounds constituting the pitch. Aug. Lemoine, in a pamphlet published in 1902 under the title Sur la connaissance des brais mineraux (Charleroi), contends that coaltar pitch is a mixture of carbon, of "carbures," and "carbenes." About the so-called "free carbon" we shall presently say more; all are agreed that it contributes nothing to the plastic and agglutinating properties of the pitch. The "carbures" are at the ordinary temperature a brownish green or black mass, like butter entirely fluid at 45 to 50 C.; they impart to the pitch its plasticity and its power to glue together pulverulent substances into solid masses. The designation of "carbenes" has been given by Lemoine to a black, crystalline, shining powder which he found in pitch, softening and fusing about 200 C. At that temperature it swells up and spreads on the glass, adhering to it but slightly. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."