| abstract |
Organic waste water containing water-soluble organic anionic substances is treated by 1. CONTACTING AN ACIDIC WASTE WATER WITH A WATER-INSOLUBLE ORGANIC SOLVENT SOLUTION OF AT LEAST ONE AMINE REPRESENTED BY THE FORMULA, -CH2-N-CH2- ¦ R wherein R1 and R 2 are each a hydrogen or halogen atom or a C1 - C4 alkyl group, and R is a C8 - C18 alkyl or alkenyl group, 2. SEPARATING THE AQUEOUS LAYER FROM THE ORGANIC LAYER, AND 3. CONTACTING SAID ORGANIC LAYER WITH AN AQUEOUS ALKALI SOLUTION WHEREBY SAID SUBSTANCES ARE TRANSFERRED TO SAID AQUEOUS ALKALI LAYER AND SAID AMINE IS RECOVERED AS THE ORGANIC SOLUTION THEREOF. |