A review of the literature pertaining to possible alternatives for hexane as solvent in the extraction of vegetable oils was made. The review was restricted to solvents obtainable from renewable resources and included the most recent technological advances in oil extraction processes. The most promising systems surveyed were based on the use of water, alcohols, ketones, halocarbons, or of liquified and supercritical gases as solvents for oils.

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Summary A simple laboratory testing apparatus and its use have been described. With relatively few pounds of material it is possible to evaluate many preparation and filtration variables and to predict with a fair degree of accuracy the behavior of a continuous horizontal vacuum filter. It is felt that such a unit will be invaluable for use in commercial plants, especially during the start‐up operations of a new plant. The bench‐scale unit should also find application in connection with other processes employing the unit operations of extraction and filtration.