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Pergamon Press Ltd., Headington Hill Hall, Oxford 4 & 5 Fitzroy Square, London W.l Pergamon Press (Scotland) Ltd., 2 & 3 Teviot Place, Edinburgh 1 Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, New York, 10523 Pergamon of Canada Ltd., 207 Queen's Quay West, Toronto 1 Pergamon Press (Aust.) Pty. Ltd., 19 a Boundary Street, Rushcutters Bay, N.S.W. 2011, Australia Pergamon Press S.A.R.L., 24 rue des Ecoles, Paris 5e Vieweg & Sohn GmbH, Burgplatz 1, Braunschweig Copyright © 1969 Verlag Chemie First English edition 1969 This is a translation of the eleventh edition of the German work Grundriß der Chemischen Technik published by Verlag Chemie, GmbH, Weinheim, in 1963 Library of Congress Catalog Card No. 67-22831 The use of utility names, trade names, trade marks, etc., in this book does not justify the assumption that such names may be used by the public. On the contrary, they often represent registered trade marks, even if they are not represented as such. Printed in Germany 08 011848 8