Concentration of Sodium Chloride, Sodium Acetate and Sodium Citrate Solutions by using Polyamide Reverse Osmosis Membrane

폴리아미드 역삼투막을 이용한 염화나트륨, 아세트산나트륨, 구연산나트륨 용액의 농축

  • Lee, Heungil (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Kim, In Ho (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 이흥길 (충남대학교 응용화학공학과) ;
  • 김인호 (충남대학교 응용화학공학과)
  • Received : 2018.07.04
  • Accepted : 2018.08.14
  • Published : 2018.10.01


Reverse osmosis (RO) concentration of sodium chloride, sodium acetate, and sodium citrate solutions has been performed by polyamide RO membrane. Concentration polarization phenomena was also studied by changing pressure, solute kinds, and initial solution concentration. Pressure effect on permeation flux was that the increase of flux was accompanied by the increase of pressure. Flux increase was observed by the decrease of initial solution concentration. Surface concentration on the RO membrane increases and so flux declines due to the concentration polarization. In the later phase of concentration, concentration polarization effect was decreased by the back diffusion of solute from the polariztion layer. In case of sodium citrate, its large ion size and charge density resulted in the discrepancy between theory and experimental data of concentration polarization. It may be due to electric repulsion on the membrane surface.


Supported by : 충남대학교


  1. Bungay, P. M., Consdale, H. K. and Pinho, M. N., Synthetic Membranes : Science, Engineering and Applications, D. Reidel Publishing, Dordrecht, Netherlands, 307(1983).
  2. Meares, P., Membrane Separation Processes, Elsevier Scientific Publishing Co., Amsterdam, Netherlands, 114(1976).
  3. MacBean, R. D. and Smith, B. R., "Reverse Osmosis in Food Processing," Food Technol., Australia, January, 247(1977).
  4. Sourirajan, S., Reverse Osmosis/Ultrafiltration Process Principles, National Research Coucil of Canada, Canada, 472(1985).
  5. Kim, W. S., Yeom, K.-H., Lee H.-W. and Lee C.-S., "Concentration Polarization and Permeate Flux in Ultrafiltration of Dextran Solution," Kor. Chem. Eng. Res., 25(6), 593-600(1987).
  6. Yeom, K.-H. and Kim, W. S., "Analysis of Mass Transfer Characteristics in Concentration Polarization Layer of Ultrafiltration," Kor. Chem. Eng. Res., 31(6), 813-823(1993).
  7. Hur, S. S., Choi, Y. H., "Studies on the Efficient Concentration Process of Apple Juice with Reverse Osmosis Process," Korean J Food Sci. Technol., 25(4), 321-326(1993).
  8. Hwang, S. T., "Fundamentals of Membrane Transport", Korean J . Chem. Eng., 28, 1-15(2011).
  9. Hong, S. S., "Numerical Studies on the Spiral Wound Membrane Module of the Rressure-retarded Osmosis (PRO) Power System," M.S. Thesis, Hongik University, Seoul, Korea (2014).
  10. Seader, J. D., Henley, E. J., Roper, D. K., Separation Process Principles, 3rd ed., Wiley, New York, USA (2010).
  11. Alvarez, V., Alvarez, S., Riera, F. A., Albarez, R., "Permeate Flux Prediction in Apple Juice Concentration by Reverse Osmosis," Journal of Membrane Science, 127, 25-34(1997).
  12. Hur, S. S., Joo, G. J., Chang, K. S. and Choi, Y. H., "Characteristics of the Gel Layer Formation in the Concentration Process of Apple Juice with Reverse Osmosis Process," Food Engineering Progress., 2(2), 114-150(1998).
  14. Buffle, J., Zhang, Z. and Startchev, K., "Metal Flux and Dynamic Speciation at (bio)interfaces. Part I: Critical Evaluation and Compilation of Physicochemical Parameters for Complexes with Simple Ligands and Fulvic/humic Substances," Environ Sci Technol., 41(22), 7609-7920(2007).