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US 3,966,981 AGranted
Process for removing residual solvents
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorWilliam G. Schultz
Life of this patent
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Abstract
Process for removing residual solvent from materials containing the same which involves extracting the material with liquid CO.sub.2, separating the phases, and evaporating CO.sub.2 from the treated material. For example, residual hexane can be removed from de-fatted soybeans by this procedure.
Claims1
A process for removing residual hexane from soybeans which have been de-fatted by extraction with hexane, which process comprises:
- a. extracting the de-fatted soybeans with liquid CO.sub.2 at a pressure and temperature at which the CO.sub.2 remains in the liquid state,
- b. separating the extracted de-fatted soybeans from the liquid CO.sub.2 extract, and
- c. evaporating CO.sub.2 from the extracted de-fatted soybeans.
Dependencies are inferred from the claim text.