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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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9.4 Batch Steam Distillation

In batch steam distillation, steam is sparged directly into the still pot as shown in Figure 9-4. This is normally done for systems that are immiscible with water. The reasons for adding steam directly to the still pot are that it keeps the temperature below the boiling point of water, it eliminates the need for heat transfer surface area and it helps keep slurries and sludges well mixed so that they can be pumped. The major use is in treating wastes that contain valuable volatile organics. These waste streams are often slurries or sludges that would be difficult to process in an ordinary batch still. Compounds that are often steam distilled include glycerine, lube oils, fatty acids, and halogenated hydrocarbons ...

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