Solvent concentration of vitamins

Claim 1

A PROCESS OF OBTAINING GLYCERIDE OIL SOLUTIONS OF HIGH VITAMIN A CONCENTRATION FROM FISH LIVER OILS CONTAINING SAID VITAMIN IN LOW CONCENTRATION, WHICH PROCESS COMPRISES COUNTERCURRENTLY EXTRACTING THE GLYCERIDE OIL IN A FIRST VERTICALLY ELONGATED ZONE WITH A LIQUID POLAR COMPOUND WHICH IS A PARTIAL SOLVENT OF THE OIL AND IS RELATIVELY INSOLUBLE IN NAPHTHA, IN A RATIO OF ABOUT 3 TO 30 PARTS OF THE SOLVENT PER PART OF OIL, INTRODUCING A REFLUX COMPRISING A SMALL AMOUNT OF NAPHTHA INTO THE ZONE NEAR THE BOTTOM THEREOF AND THE ZONE BEING MAINTAINED AT A TEMPERATURE TO OBTAIN SOLUTION IN SAID SOLVENT OF ABOUT 3 TO 30 PERCENT OF THE OIL AS AN EXTRACT PHASE, THE EXTRACT IN SAID SOLVENT COMPRISING UNSATURATED GLYCERIDES, FREE FATTY ACIDS AND VITAMIN A, AND FURTHER TO OBTAIN A RAFFINATE FRACTION COMPRISING THE REST OF THE OIL, EXTRACTING OUT THE GLYCERIDES AND VITAMIN A FROM THE SOLUTION AND LEAVING THE FATTY ACIDS IN SOLUTION IN THE SOLVENT, BY PASSING THE EXTRACT SOLUTION TO A SECOND VERTICALY ELONGATED ZONE AND CONTACTING THE EXTRACT SOLUTION IN THE SECOND ZONE WITH NAPHTHA WHEREBY TO OBTAIN A SOLUTION OF GLYCERIDE OIL AND VITAMIN A IN THE NAPHTHA AND A BY-PRODUCT IMPOVERISHED IN VITAMIN A AND COMPRISING THE FATTY ACIDS IN SOLUTION IN THE POLAR SOLVENT AND RECOVERING THE GLYCERIDE OIL AND VITAMIN A FROM THE NAPHTHA.