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Rhone-Poulenc, N J , u s i n g a small cross-flow b e n c h f a c i l i t y , followed b y c o l l e c t i o n of a l l s u s p e n d e d s o l i d s on a small f i l t e r disc f o r K a n a l y s i s .

This paper was prepared in connectionwith work done underthe above contractnumberwith the U. S. Department of Energy. By acceptanceof this paper, the publisherand/or recipientacknowledgesthe U. S. Government'srightto retain a nonexclusive,royalty-freelicensein and to any copyrightcoveringthis paper, along with the tightto reproduceand to authorizeothersto reproduceall or part of the copyrightedpaper.. DISCLAIMER l%is report was prepared as~account of work sponsored by an agency of the United States Government. Neither the Umted.States Gove~ent nor any agency thereof, nor any of their employees, makes any warranty, express or unphed, or assumes. any legaI liability Or responsibility for the accuracy, completeness: or usefulness of any mforrnation, app~ms, produc~or process disclose&or represents that Its use would not infringe privately owned rights. Reference herein to any specific commercial produc~process, or service by trade name, trademar~manufacturer, or otherwise does not necessarily constitute or imply its endorsemenr ecommendation, or favoring by the United States Government or any agency Othereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. This report has been reproduced directly fium the best available copy.

Nitrogen sparging is a cost effective method for stripping benzene from dilute salt solutions. In theory, the sparging gas, dispersed in fine droplets in the solution, is rapidly saturated with benzene. Under Late Wash conditions, sparging was efficient down to 5 mg/L. Stripping to lower concentrations required additional time and stripping under more concentrated Small Tank conditions was not investigated. A key concern is foaming introduced by the gas bubbles, necessitating mechanical foam breakup equipment. Foaming in concentrated salt solutions is particularly problematic since this can lead to "solid stationary foam" difficult to move or disperse. A sparging operation would likely require two tanks, a feed tank and a sparge tank, and would result in a separate batch operation following continuous Small Tank Precipitation. Existing ITP packed columns and Late Wash tanks could be utilized for stripping and sparging.The opposite of sparging (bubbles of gas in a liquid) would be a shower of liquid droplets in a gas to minimize foaming. This could be achieved in a static column, or dynamically using a vortex scrubbing device. RECOMMENDATIONS 1. 2.Consult with industry and equipment manufacturers to identify proven technology for processkg concentrated salt solutions and minimizing foaming, including non-foaming column packing, shower cohmms, and vortex scrubbing.Test selected components for operability and foaming under Small Tank Precipitation processing conditions. L. O. Dworjanyn

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