Method of repurifying cooking oils used in deep-fat frying operations

Claim 1

A PROCESS FOR THE PURIFICATION OF USED VEGETABLE COOKING OILS EMPLOYED IN DEEP FAT FRYING, SAID OILS HAVING A FREE FATTY ACID CONTENT IN EXCESS OF ABOUT 0.20% AND A SMOKE POINT FROM ABOUT 340*F. TO ABOUT 370*F., COMPRISING ADMISING SAID OILS WITH AN ADSORBENT MATERIAL AT ATMOSPHERIC PRESSURES IN AN AMOUNT OF FROM ABOUT 2% TO ABOUT 7% BY WEIGHT, SAID ABSORBENT BEING SELECTED FROM THE GROUP CONSISTING OF AN ALKALINE EARTH METAL CARBONATE AND AN ALKALINE EARTH METAL OXIDE CONSISTING OF ALKALINE EARTH METAL AND OXYGEN FOR A PERIOD OF TIME OF FROM ABOUT THREE TO ABOUT FIFTEEN MINUTES TO REDUCE SAID FREE FATTY ACID CONTENT TO BELOW ABOUT 0.10% AND TO INCREASE SAID SMOKE POINT THEREOF TO IN EXCESS OF ABOUT 410*F., SAID OILS BEING AT A TEMPERATURE OF FROM ABOUT 68*F. TO 356*. AND REMOVING SAID ADSDORBENT FROM SAID OILS BY MECHANICAL AGENTS, WHEREBY THE FATTY ACID CONTENT OF SAID USED OILS IS REDUCED TO BELOW ABOUT 0.10% WITHOUT SUBSTANTIAL SAPONIFICATION AND SAID SMOKE POINT THEREOF IS INCREASED TO IN EXCESS OF ABOUT 140*F.