Induced poisoning and chemical regeneration with apolar adsorbent resins solvents.

The poisoning of a commercial resin, Amberlite XAD-4, has been induced, und er the regular conditions used for phenols elimination of effluents in the coal chemistry industry. It has been observed that after successive regener ation cycles with sodium hydroxide, a progressive impairment of the adsorbe nt is produced, caused by the irreversible adsorption (poisoning) of high m olecular compounds present in the effluent, like the naphthalene. Laborator y assays state the first hypothesis about the poisoning mechanisms. On the other hand, several organic solvents have been tested for the chemical rege neration of the resin, acetone and ethanol, obtaining satisfactory results.