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Continuous extraction of oil-containing vegetable matter with pressurized normally gaseous solvent

  • US 5,041,245 A
  • Filed: 03/10/1989
  • Issued: 08/20/1991
  • Est. Priority Date: 03/10/1989
  • Status: Expired due to Fees
First Claim
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1. In a continuous method for extracting oil from communited oil-containing vegetable matter in which said vegetable matter is passed through a closed extraction zone in contact with a liquid extraction solvent medium wherein said extraction solvent medium is a normally gaseous hydrocarbon under a pressure in said extraction zone sufficient to liquify the same and up to about 250 psi, the improvement of continuously introducing said vegetable matter into said extraction zone for extraction therein by the steps comprising:

  • advancing said vegetable matter through an elongated tubular screw-feeding zone communicating at its discharge end with one end of said extraction zone, subjecting said vegetable matter while within said screw-feeding zone to compacting pressure to create a region of compacted vegetable matter, and introducing under pressure into the compacted matter region for admixture with the compacted matter passing therethrough an innocuous normally liquid sealing medium, which if different from said oil is capable of being separated from the extracted oil, in an amount up to about 10% by weight of said compacted matter, and sufficient when mixed with the compacted matter to form the same into a generally plastic mass capable of sustaining the pressure in said extraction zone, the magnitude of said compacting pressure in the absence of said sealing medium being insufficient either to express said oil directly from said vegetable matter or to densify said matter to a solid dam of a density sufficient to contain the pressure in said extraction zone.

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