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Process for oilseed extraction with an isopropanol-based solvent

  • US 4,298,540 A
  • Filed: 12/15/1980
  • Issued: 11/03/1981
  • Est. Priority Date: 12/15/1980
  • Status: Expired due to Fees
First Claim
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1. In the process for the recovery of oils from seeds containing extractable oils, comprising steps for contacting seeds having a water content of between about 9 and 13 percent by weight with an isopropanol-based extraction solvent in an extraction zone to obtain an extract of desired seedoils in the solvent, cooling the extract, and phase-separating the cooled extract into a lower liquid oil phase which is rich in seedoils and an upper liquid solvent phase containing recovered solvent, the improvement which comprises dividing the recovered solvent phase of the phase separation into a first division fraction comprising between about 60 and 95 percent of the solvent phase and a second division fraction comprising between about 5 and 40 percent of the solvent phase, directly recycling said first division fraction to the extraction zone as extraction solvent, distilling the second division fraction to yield a liquid distillation bottoms product comprising water and free fatty acids and a vapor distillation overhead product consisting essentially of a constant boiling mixture of isopropyl alcohol and water, condensing said vapor overhead to a liquid distillation overhead product, and recycling said liquid distillation overhead product to the extraction zone as extraction solvent.

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