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By Leslie S. Ettre, Albert Zlatkis

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The concentration profiles were very broad and irregular, caused by diffusion, condensation and column overloading and thus, an analytical evaluation was not possible. As expressed by Neufeld ( 3 ) , "at these preparative dimensions the efficiency of the method in the milligram region had to remain hidden". Coming back to my own activities, in 1941 I was involved in kinetic measurements on the hydrogenation of acetylene. In this connection the need for a quick and exact method of analysis of the two hydrocarbons, acetylene and ethylene, arose and as we were also occupied with investigations on the adsorption processes, it was evident to try separation by adsorption.

We did some fine work with it, using it for both oil constitution purposes and in the preparation of highly pure reference compounds. Keulemans - who at that time had already left for Eindhoven Technical University - was so impressed that, with his usual enthusiasm and charm, he widely advocated the instrument as the only sensible way of doing high-performance preparative work. He followed his own advice by asking - and getting - permission to install a dual unit of improved design at his Institute in Eindhoven.

8 H. Boer, J . A p p l . Chem. 14 (1964) 275. 9 H. G. 109-132. 10 H. Boer, Chromatographia 2 (1969) 118. 11 H. Schuringa and K. Kampman, B r i t . Pat. 974 964. This Page Intentionally Left Blank 21 ERIKA CREMER ERIKA CREMER was born in 1900, in Munich, Germany, into a family of scientists: her great-grandfather, grandfather and father were university professors and so are her two brothers. Thus, it is natural that she also chose a scientific career. D. in 1927, under Bodenstein. In the following 12 years, she was associated with the Kaiser-Wilhelm-Institut in Berlin, the Universities of Freiburg, Munich and Kiel, and the Physikalisch-Technische Reichsanstalt, working with Bonhoeffer, v.

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