Improved extraction efficiency by double‐soak, filtration‐extraction process

A simple and inexpensive modification of the filtration extraction process has been described which permits improved extraction efficieney and reduced solvent requirements over that presently obtained. It comprises an additional soaking step, which can be readily incorporated. Bench‐scale data are presented on three different oil‐bearing materials which demonstrate that, at equivalent solvent‐meats ratios, the percentage of residual lipids in the extracted meal products can be reduced about 50% or more by use of the double‐soak over the single‐soak procedure or that, for equivalent percentages of residual oil in extracted meals, the solventmeants ratio can be reduced significantly. A laboratory method is described whihc is recommended for use in the design of commercial‐scale installations employing the double‐soak, filtration‐extraction process.