Equilibrium in the Reactive Extraction of Aqueous Phenol Using Tributyl Phospate in n-Hexane

https://doi.org/10.22146/ajche.50085

Panut Mulyono(1*), Sofiyah Sofiyah(2), Ahmad Muhajir Kahuripan(3)

(1) Department of Chemical Engineering, Faculty of Engineering, Gadjah Mada University. Jl. Grafika No. 2, Kampus UGM, Yogyakarta 55281, Indonesia.
(2) Department of Chemical Engineering, Faculty of Engineering, Gadjah Mada University. Jl. Grafika No. 2, Kampus UGM, Yogyakarta 55281, Indonesia.
(3) Department of Chemical Engineering, Faculty of Engineering, Gadjah Mada University. Jl. Grafika No. 2, Kampus UGM, Yogyakarta 55281, Indonesia.
(*) Corresponding Author

Abstract


Phenol is a hazardous chemical which usually contained in the wastewater from some industries, such as oil refineries, coal processing, and plastics. Phenol is dangerous substance to a microorganism although in low concentration in wastewater. According to the United State Environmental Protection Agency, the maximum concentration of phenol in wastewater is 1 ppm. This requirement is lower than the concentration of phenol in normal wastewater discharged from industries that is 100 to 1000 ppm. Phenolic substances are very difficult to be destroyed by oxidation in the present of microorganism. Chemical oxidation of phenolic substance using ozone or combination between the ozone and UV irradiation is impossible to handle huge amount of wastewater due to the expensiveness of ozone production and also its low solubility in water. The prospective method to recover of phenol from wastewater is reactive extraction in which phenol makes a complex with the extractant. This research investigated the equilibrium of the reactive extraction of phenol from water using tributyl phosphate (TBP) in n-hexane. An equilibrium model has been developed in this research and the laboratory experiments have been carried out. The parameters of the laboratory experiment are the initial concentration of TBP in n-hexane, and the extraction temperature. The experimental results showed that the higher the TBP concentration in n-hexane, the higher the amount of phenol which can be extracted to the organic phase. The correlation between the distribution coefficients (Kc) with the ration of TBP concentration (CoTBP) to the initial TBP concentration (CoiTBP) in n-hexane can be formulated by Kc=11.59-12.002(CoTBP)/(CoiTBP) with the sum of square of error of 10.87%. The lower the extraction temperature, the higher the amount of phenol extracted to the organic phase. The correlation between the distribution coefficients with the temperature (T) can be approached by Kc=1505.45(1/T)-4.06 with the sum of square of error of 2.63%. The value of distribution coefficient of physical equilibrium (Kp) decreases with the increase of temperature, meanwhile the value of the equilibrium constant of solvation reaction (Kr) is increase with increasing the temperature. The expression of Kr as a function of temperature is Kr=-2.8636(1/T)+0.0133 with the sum of square of error of 0.04%.

Keywords


Equilibrium, Reactive Extraction, Phenol, Tributyl Phosphate, n-Hexane

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References

  1. Igarashi, K., Yamada, Y., and Kurumada, K., (2004), "Removal of Phenol from an Aqueous Solution using Hydrogel Incorporated with Extractant Tributyl Phosphate," J. Chem. Eng. Japan, 37(10), 1279-1283.
  2. Kurumada, K., Tanigaki, M., Sugitani, N., and Igarashi, K., (2004), "Phenol Extraction into Perfluoroalkane Phase Containing Extractant Tributyl Phosphate Enhanced by Addition of Alkane," J. Chem. Eng. Japan, 37(5), 636-644.
  3. MacGlashan, J.D., Bixby, J.L., and King, C.J., (1985), "Separation of Phenols from Dilute Aqueous Solution b Use of Tri-n-Octyl Phosphine Oxide as Extractant, "Solvent Extraction and Ion Exchange, 3(1&2), 1-25.
  4. Matsumoto, M., Yuba, S., and Kondo, K., (1998), "Synergistic Extraction of Lactic Acid with Tri-n-Octylamine and Tri-n-Butylphosphate," J. Chem. Eng. Japan, 31(6), 996-998.
  5. Mulyono, P. and Pardah, A., (2008), "Equilibrium Study on Reaction Extraction of Lactic Acid with Tri-n-Butyl Phosphate in n-Hexane, " Conference Proceedings of AIChE Annual Meeting, Philadelphia, PA.
  6. Shah, D.J., Tiwari, K.K., (1981), "Recovery of Actic Acid from Dilute Aqueous Stream Using Liquid-liquid Extraction with Tri-n-Butyl Phosphate as Solvent," J. Sep. Process Technol., 2(4), 1-6.
  7. Urtiaga, A.M. and Ortiz (1997), "Extraction of Phenol Using Trialkylphosphine Oxides (Cyanex 923) in Kerosene," Sep. Sci. and Technol., 32(6), 1157-1162.



DOI: https://doi.org/10.22146/ajche.50085

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