Technical assistance, 71 vacuum

The authors wish to acknowledge their gratitude to National Research Corporation who made this review of high vacuum knowhow possible, by granting company time and technical assistance. Also the authors are indebted to H. A. Steinhertz for reviewing the manuscript and for his many valuable suggestions. 

A study of the wet circuit operations, with the technical assistance of Asturiana de Zinc, showed that the majority of the zinc loss was due to the low wash efficiency of the existing vacuum drum filters. In addition, it was observed that there still was an amount of recoverable zinc in both the lead-silver and jarosite residues, and that several other steps of the wet circuit could be improved. 

Heindl A. Microwave assisted vacuum convection drying. Ph.D. thesis. Technical University of Munchen, Munchen, Germany 1993 (in German). 

Massimo De Pastena is sales manager for Tiger-Vac, Inc. (www.tiger-vac.com), a leading manufacturer of legally certified explosion proof vacuum cleaners with over 40 years of experience. Technical representatives are available to assist you in your risk assessment and in the recommendation of the appropriate equipment for your application. 

Solvent-assisted flavor evaporation (SAFE)—a new and versatile technique for the careful and direct isolation of aroma compounds from complex food matrices—was developed in 1999 by W. Engel et al. (104). Technical details and the design of the SAFE apparatus are exhaustively described by the authors. SAFE includes a compact distillation unit in combination with a high vacuum pump (Fig. 20). The developers of this new equipment pointed out the following advantages ... 

D.M. Mattox, The historical development of controlled ion-assisted and plasma-assisted PVD processes, in Proceedings of the 40th Annual Technical Conference, Society of Vacuum Coaters, 1997, p. 109. 

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