Abstract
In this study, nanofiltration with NF200 membrane was employed to remove KCl from ion-exchanged solutions containing potassium clavulanate. The pore radius of NF200 membrane was estimated to be around 0.39 nm. The effects of operating pressure on separation performance were investigated in a range of 100–400 psig. The influences of cross-flow velocity (0.14–0.70 cm/s), temperature (4–25 °C), and feed composition were also investigated. In all experiments, clavulanate rejection showed high levels from 0.91 to 0.99, while chloride rejection ranged from 0.06 to 0.54. In a case at an operating pressure of 50 psig and 25 °C, as much as 94% of clavulanate was retained while 94% of chloride was removed, indicating that NF200 membrane was a suitable choice for selectively removing KCl. NF200 membrane also showed a stable performance in the operational stability test with an ion-exchanged solution obtained by treating actual fermentation broth.
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Abbreviations
- A J :
-
Frequency factor (L/m2 h)
- A k :
-
Membrane porosity
- C f :
-
Solute concentration in feed (mol/L)
- C m :
-
Solute concentration at membrane surface (mol/L)
- C p :
-
Solute concentration in permeate (mol/L)
- D s :
-
Solute diffusivity (m2/s)
- E J :
-
Permeation activation energy (J/mol)
- H D :
-
Wall correction factor for diffusion
- H F :
-
Wall correction factor for convection
- J s :
-
Solute flux (mol L/m2 h)
- J v :
-
Solution flux (L/m2 h)
- L p :
-
Pure water permeability (L/m2 h psig)
- ΔP :
-
Pressure difference (psig)
- P s :
-
Solute permeability (L/m2 h)
- r p :
-
Membrane pore radius (nm)
- r s :
-
Solute radius (nm)
- R :
-
Gas constant (J/mol K)
- R obs :
-
Observed rejection
- R real :
-
Real rejection
- S D :
-
Steric hindrance factor for diffusion
- S F :
-
Steric hindrance factor for convection
- T :
-
Temperature (K)
- Δx :
-
Membrane thickness (m)
- λ :
-
Ratio of solute radius to membrane pore radius, r s/r p
- Δπ :
-
Osmotic pressure difference (psig)
- σ :
-
Reflection coefficient
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Acknowledgments
This work was supported by the Industrial Source Technology Development Programs (No. 10032001) of the Korean Ministry of Knowledge Economy.
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Kim, H.H., Kim, J.H. & Chang, Y.K. Removal of potassium chloride by nanofiltration from ion-exchanged solution containing potassium clavulanate. Bioprocess Biosyst Eng 33, 149–158 (2010). https://doi.org/10.1007/s00449-009-0360-7
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DOI: https://doi.org/10.1007/s00449-009-0360-7