Methods and compositions for controlling animal parastites

Claim 1

IN A PROCESS OF PRODUCING VITAMINS OF THE B12 GROUP, THE STEPS OF TREATING A CONCENTRATE CONTAINING VITAMINS OF THE B12 GROUP WITH AN ORGANIC SOLVENT MIXTURE COMPRISING A MONO-HALOGENATED PHENOLS SELECTEDF FROM THE GROUP CONSISTING OF MONO-HALOGENATED PHENOLS HAVING THE HALOGEN GROUP IN THE POSITION META AND MONO-HALOGENATED PHENOLS HAVING THE HALOGEN GROUP IN THE POSITION PARA TO THE HYDROXY GROUP OF SAID PHENOL, DISSOLVED IN A LIQUID ORGANIC SUBSTANCE IN WHICH SAID VITAMINS OF THE B12 GROUP ARE INSOLUBLE AND BEING SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS HALOGENATED HYDROCARBONS AND CARBON DISULFIDE, THEREBY FORMING AN EXTRACTSOLUTION OF SAID VITAMINS OF THE B12 GROUP DISSOLVED IN SAID SOLVENT MIXTURE, TREATING THE THUS-FORMED ORGANIC EXTRACT SOLUTION CONTAINING THE VITAMINS OF THE B12 GROUP WITH WATER AND WITH A WATER SOLUBLE ALCOHOL, THEREBY CAUSING DUE TO SAID ALCOHOL SUBSTANTIALLY QUANTITITATIVE TRANSFER OF SAID VITAMINS OF THE B12 GROUP INTO THE AQUEOUS PHASE, SATURATING THE THUSOBTAINED AQUEOUS SOLUTION CONTAINING SAID VITAMINS OF THE B12, GROUP DISSOLVED THEREIN WITH A PHENOL SELECTED FROM THE GROUP CONSISTING OF META AND PARA CHLOROPHENOL IN THE PRESENCE OF AN INERT SOLID POROUS ABSORBENT MATERIAL, THEREBY FORMING A PRECIPITATE CONTAINING THE OILY WATERINSOLUBLE COMPLEX OF SAID VITAMINS OF THE B12 GROUP AND SAID PHENOL ABSORBED BY SAID INERT SOLID POROUS ABSORBENT MATERIAL FILTERING SAID PRECIPITATE, WASHING THE THUS OBTAINED FILTERED PRECIPITATE WITH A LOW MOLECULAR WEIGHT KETONE SO AS TO FREE SAID VITAMINS O THE B12 GROUP FROM SAID PHENOL, AND RECOVERING THE THUS FREED VITAMINS OF THE B12 GROUP.