Process for the production of selectively acting bleaching powders, catalysts, and related products on the basis of clays capable of activation

Claim 1

PROCESS FOR ACTIVATING AND IMPROVING THE ABSORPTIVE PROPERTIES OF A DE-COLORIZING EARTH OF THE MONTMORILLONITE GROUP OF CLAYS, INCLUDING THE STEPS OF TREATING THE EARTH WITH A RELATIVELY DILUTE MINERAL ACID, WHEREBY ONLY A PORTION OF THE BASES IS REMOVED, AND THERE IS LEFT WATER COMBINED WITH THE EARTH, WASHING THE EARTH TO REMOVE SUBSTANTIALLY ALL THE ACID, PRE-DRYING THE EARTH AT A TEMPERATURE NOT SUBSTANTIALLY GREATER THAN 220* F., REMOVING FROM THE WASHED EARTH THE REMAINING WATER, BY EXTRACTING THE EARTH WITH A VOLATILE WATER SOLVENT OF RELATIVELY HIGH STRENGTH, UNTIL A MAJOR PORTION OF THE WATER HAS BEEN SUBSTITUTED BY THE VOLATILE WATER SOLVENT, AND THEN REMOVING THE VOLATILE SOLVENT AT A TEMPERATURE NOT MATERIALLY IN EXCESS OF 220* F.