ABSTRACT
This chapter covers the theory and practice of the solvent extraction process. The process principles and theoretical aspects of each of the sections of the solvent extraction plant (SEP), namely, extraction, desolventisation, distillation and vent absorption, are discussed. Mathematical models of processes are covered; this should be of help to students of oil technology, as also to plant engineers. Discussion on utility requirements for various seeds and presscakes should be of guidance to plant engineers.
Technology of solvent extraction of various oil-bearing materials, including presscakes of various seeds, is discussed. Soybean, being the dominant material subjected to solvent extraction worldwide, is discussed in detail, covering various process options for de-oiled meal for usage in animal feed and in human food. Technology employed for other materials is discussed, highlighting the differences in operation conditions with those employed for soybean. The machinery employed for solvent extraction is the same for all oilseeds; except for the desolventiser whose design tends to change for different oilseeds. Precautions for plant safety and products quality are outlined during the discussion of technology for specific oilseeds. Degumming process for soybean oil, and miscella refining process for cottonseed oil are discussed, since these are located in the SEP. Benefits of miscella refining of cottonseed oil are highlighted.
