Extraction of Valeric acid using phosphate salts and PEG in aqueous two phase systems
Volume Title: 1
Authors
1Iran University of Science and Technology, School of Chemical, Petroleum and Gas Engineering, Tehran, Iran
2مهندسی شیمی- فرآیندهای جداسازی-
3گروه مهندسی شیمی دانشکده فنی مهندسی دانشگاه گیلان
Abstract
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.
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