Extraction of sterols and antioxidants

Claim 1

A PROCESS OF OBTAINING A CONCENTRATE OF THE UNSAPONIFIABLE MATTER OF SOYBEAN OIL FROM A MIXTURE OF FATTY GLYCERIDES OF SOYBEAN OIL CONTAINING FROM 4 TO 30% OF UNSAPONIFIABLE MATTER OF SOYBEAN OIL AND 5 TO 40% OF FREE FATTY ACIDS OF SOYBEAN OIL, WHICH PROCESS COMPRISES SAPONIFYING THE GLYCERIDES AND THE FREE FATTY ACIDS IN SAID MIXTURE WITH AN ALKALI, MAKING UP THE RESULTANT MIXTURE CONTAINING SOAPS OF FREE FATTY ACIDS AND UNSAPONIFIABLE MATTER INTO SOLUTION WITH WATER AND ISOPROPYL ALCOHOL, THE WATER BEING PRESENT IN A PROPORTION OF 277.5 TO 2775 PARTS, AND THE ISOPROPYL ALCOHOL BEING PRESENT IN A PROPORTION OF 92.5 TO 925 PARTS FOR EACH 200 PARTS OF THE MIXTURE, THEN REMOVING THE UNSAPONIFIABLE MATTER FROM THE MIXTURE BY INTRODUCING THE SOLUTION INTO THE UPPER PORTION OF AN EXTRACTION ZONE WHILE INTRODUCING NAPHTHA, IN A PROPORTION OF 1 TO 10 PARTS PER PART OF SOLUTION, INTO THE LOWER PORTION OF THE SAME ZONE, DRAWING OFF THE NAPHTHA SOLUTION OF UNSAPONIFIABLE MATTER AT THE TOP OF THE ZONE, AND EVAPORATING THE NAPHTHA TO OBTAIN SAID FRACTION OF UNSAPONIFIABLE MATTER.