Details of design and operation are given for a laboratory-size, 20-stage, multiple-contact, "unlimited-feed", countercurrent-flow, liquid-liquid extractor. The apparatus consists mainly of glass parts that are joined by polyethylene tubing and are mounted in a steel cradle that can rotate on its horizontal axis. The reservoirs for feed liquids are an integral part of the assembly, and proper· rotation of the assembly causes the flow of liquids to, through and from the extractor . Testing and developing of, and small scale production by, extraction systems are conveniently carried out in this extractor. Stagewise and product samples can be readily obtained for study of the extraction behavior of the components of a liquid-liquid system.
Wilhelm, Harley A., "A small scale countercurrent liquid-liquid extractor" (1961). Ames Laboratory Technical Reports. 40.