Filter Cake


Drying and solvent recovery of a very heat-sensitive material. Wet material forms balls. Dried lumps disintegrate readily to powder. Material very abrasive. Problems: No overheating. Recover solvent. Operate with minimum inert gas to maintain drying atmosphere below 5% oxygen. Results: TURBO-DRYER output assays very high. Outdoor dryer meets insurance company requirements. 1.5 to 2 cf inert gas per pound solvent. High butanol recovery. Dried product in small lumps; negligible powder or dust. Minimal wear after 4 years.


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