Лако-красочные материалы — производство

This fifth edition of Grundlegende Operationen der Farbenchemie constitutes an expansion of the fourth edition. Since the appearance of the first edition in 1920, so many new processes of dye chemistry have been discovered that it appeared necessary to rework or enlarge various sections. In particular, the preparation of several important intermedi­ates has been resurveyed.

The book is intended principally to introduce to the beginner the methods of dye chemistry, and not merely to present a collection of recipes. To this end, the chapter on the practical work in the organic industrial laboratory has been reworked and enlarged in order to clarify all the important points. The chapter on analysis of dyes has been re­vised so that the student may gain some insight into this difficult field. Also, the section on the determination of light fastness has been re­written, and we are grateful to Dr. Ris (Basel) for his contributions to this subject. These additions have increased the scope of the book. We hope that they have also increased its usefulness.

H. E. Fierz-David Louis Blangey

Zurich, November 3, 1942 Chem.-Techn. Laboratorium der Eidgenossischen Technischen Hochschule

Twenty-eight years have elapsed since the publication of the first edition of Grundlegende Operationen der Farbenchemie. In the mean­time the technology of dyestuff intermediates and the dyes obtained from them has developed widely, and the processes described in 1920 are very well known today.

Editions subsequent to the first (up to the seventh edition, published in Vienna in 1947) were expanded considerably in collaboration with L. Blangey. The main aim was always to explain the fundamental prin­ciples of dye chemistry to the student; and, since it was the endeavor of the authors to write a laboratory book and not an encyclopedia, in general only simple examples were given in this work. The preface to the first edition indicated that the processes described were perhaps not the best, but that by following the instructions exactly the results stated would be obtained. In dye chemistry, as is well known, many roads lead to the same goal.

The present edition is not intended to compete with more compre­hensive books such as that of P. H. Groggins, Unit Processes in Organic Synthesis (1947). The latter is a textbook, while Grundlegende Opera­tionen der Farbenchethie, like Gattermann’s book Praxis des Organ — ischen Chemikers, is primarily a laboratory manual. The reprinting of the fifth Austrian edition in the United States — without the consent of the authors — indicated recognition of the need for such a volume.

It seems apropriate, however, to publish a new, American edition in which several reactions are described that have not appeared in pre­vious editions and which corrects minor errors discovered in the Aus­trian edition on which the translation is based. These are the only changes considered necessary.

After the present translation had been printed, the allied reports on German and Japanese industry were made public. The authors noted to their satisfaction that the processes they described corresponded closely in many cases with those of the German dye factories. Certain large-scale industrial reactions can be reproduced only with difficulty in the laboratory with the small amounts of material at the chemist’s disposal In our opinion, for example, it is practically impossible in the

laboratory to fractionate and crystallize out at low temperatures the mixtures of chlorotoluenes as described in BIOS Final Report No. 1145. On the other hand, we would like to point out here that 1-naphthyl — amine-3-sulfonic acid can be separated easily from the mixture of the

1,6- , 1,7-, and 1,8- acids by precipitating carefully with acid, according to FIAT Final Report No. 1016. The other processes correspond so closely with those we present that there is no need for further amend­ments.

We want to thank Dr. Paul W. Vittum for a translation that corre­sponds so well with the sense of the original German. We hope that this American edition will fulfill its purpose and be cordially received.

H. E. Fierz-David Louis Blangey

Zurich, December 1, 1948

Swiss Federal Institute of Technology