extraction of valeric acid using phosphate salts and peg in aqueous two phase systems

The application of aqueous two phase systems (atpss) is a powerful and efficient method to extract metal ions, as well as biomolecules such as proteins, enzymes, organic acids and antioxidants# in this study, the distribution and phase equilibrium of separation of valeric acid or pentanoic acid (c5h10o2) in atps has been investigated# valeric acid is used in the perfume industry, the production of synthetic lubricants, agriculture and pharmaceuticals# distribution coefficient and efficiency of valeric acid in the presence of peg2000 and peg8000 and phosphate salt such as sodium di-hydrogen phosphate, di-potassium hydrogen phosphate and di-ammonium hydrogen phosphate at two different temperatures which are 25 ° c and 35 ° c have been reported# the effect of salt type, temperature, ph and salt concentration have been studied# it was observed that as the temperature and ph decreases, the partition coefficient and efficiency of valeric acid increase# by increasing salt concentration and molecular weight of polymer, the partition coefficient and efficiency of valeric acid were decreased# in addition, sodium di-hydrogen phosphate also has higher efficiency of extraction (60% at 25 °c and peg2000) relative to other phosphate salt#