Process for the refining or beneficiation of the isomers of benzene hexachloride

Claim 1

A PROCESS OF SEPARATING GAMMA ISOMER FROM A MIXTURE OF BENZENE HEXACHLORIDE ISOMERS CONTAINING AT LEAST THE ALPHA AND GAMMA ISOMERS WHICH COMPRISES THE STEPS OF BRINGING A CONTINUOUS FLOW OF A SOLUTION OF A MIXTURE OF BENZENE HEXACHLORIDE ISOMERS TO A STATE OF METASTABLE SUPERSATURATION IN RESPECT OF AT LEAST THE GAMMA ISOMER, CONTINUOUSLY INTRODUCING THE METASABLE SUPERSATURATED SOLUTION INTO THE LOWER PORTION OF A CRYSTALLIZATION VESSEL CONTAINING A LARGE SURFACE OF GAMMA CRYSTALS, THE RATE OF INTRODUCTION OF SAID METASTABLE SUPERSATURATED SOLUTION INTO SAID VESSEL BEING SUCH AS TO MAINTAIN CRYSTALS IN SAID VESSEL IN SUSPENSION AND CLASSIFY SAID CRYSTALS WHILE SUBSTANTIALLY ISOTHERMAL CRYSTALLIZATION TAKES PLACE THEREIN, REMOVING SPENT SOLUTION AND RELATIVELY FINE CRYSTALS FROM THE UPPER PORTION OF SAID VESSEL, AND REMOVING RELATIVELY COARSE CYRSTALS OF SEPARATED GAMMA ISOMER FROM THE LOWER PORTION OF SAID VESSEL.