Process of producing highly pure alcohol by extractive distillation with water

Claim 1

A PROCESS FOR PRODUCING HIGHLY PURE, CONCENTRATED ALCOHOL FROM AN IMPURE DILUTE AQUEOUS ALCOHOLIC SOLUTION, WHICH COMPRISES SUBJECTING SAID SOLUTION TO A FIRST EXTRACTIVE DISTILLATION IN A DISTILLING COLUMN HAVING A DECANTER IN ITS HEAD PART, INTRODUCING HOT EXTRACTIVE WATER TO SAID DECANTER, CONCENTRACTING IMPURTIES COLLECTED AT THE TOP OF THE COLUMN AND WITHDRAWING THEM, WITHDRAWING THUS PARTLY PURIFIED, DILUTE AQUEOUS ALCOHOL FROM THE FIRST EXTRACTIVE DISTILLATION AND CONCENTRATING THE SAME TO AT LEAST 90% BY WEIGHT ALOCHOL TO FORM A PARTLY PURIFIED PHLEGM, SUBJECTING SAID PHLEGM TO A SECOND EXTRACTIVE DISTILLATION WITH HOT WATER IN A SECOND DISTILLING COLUMN, WITHDRAWING AN ALCOHOL-CONTAINING AQUEOUS LIQUID CONTAINING SUBSTANTIALLY THE WHOLE OF THE REMAINING IMPURITIES IN DILUTED CONDITION FROM THE HEAD OF SAID SECOND COLUMN AND RETURNING THE SAME TO THE FIRST EXTRACTIVE DISTILLATION, WITHDRAWING FURTHER PURIFIED DILUTE ALOCHOL FROM THE LOWER PORTION OF SAID SECOND COLUMN AND RECTIFYING THE THUS PURIFIED DILUTE ALCOHOL TO CONCENTRATE THE SAME.