Extraction methods for drying oils

Summary The general trend in the industry is toward solvent-extraction recovery and to larger plants. Technological change in recent years has been largely in improved equipment and process improvements to decrease operating costs and improve product quality. It is the author’s opinion that the trend mentioned above and this type of technological change will continue in at least the near future. It is expected that any radical change in processing will come about only by a radical change in raw material or products desired rather than by the development of really new equipment or process methods. One interesting development in recent years is the increasing relative importance of the residue solids compared to the oil in the case of some of the materials. Plants have been built primarily as a source of protein rather than oil in certain cases. It also accounts for the incidence of some small plants in the raw material “fringe” areas contrary to the general trend.