NEW TANNING PROCESS IN A WATER IMMISCIBLE ORGANIC-SOLVENT MEDIUM - USE OF CHROME TANNING MATERIALS WITH AUTOMATIC BASIFICATION

Studies carried out with a view to reducing mineral pollution linked t o chrome presence in tannery effluents helped enhance float exhaustion , but chrome contents in wastewaters remained greater than those requi red by environmental legislation. Our tanning process, in a water-immi scible organic solvent, led to a total exhaustion during the tanning p rocess and unfixed chrome contents in the aqueous effluents of the sub sequent operations were considerably reduced. The use of tanning mater ials with automatic basification: Baychrom products (in powder form fr om Baer) have been the subject of this paper in an attempt to obtain a maximal chrome fixation and good quality leather.