Separation of aniline from industrial wastewater with extraction technology
萃取技术分离工业废水中的苯胺

Nitrobenzene extraction enhanced by salting-out effect was employed to recover aniline from wastewater at 25℃.The batchwise experiments were conducted to elucidate the influence of various operating variables on the extracting performance,including acidity of wastewater,initial aniline concentration,ratios of solvent versus wastewater,extraction stages,concentrations and species of inorganic salts,such as NaCl,KCl,Na2SO4,CaCl2 and K2SO4.Thus the optimal operating conditions were given.The experimental results showed that the aniline from wastewater could be effectively seperated with nitrobenzene,high pH values and volume ratios of nitrobenzene/wastewater were more suitable for recovery of aniline,and the recovery of aniline was increased with concentrations of salts.The recovery of aniline reached nearly 100% under appropriate conditions by salting-out effect when five stage extraction was used.