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  • Diafiltration is used to allow a high level of desalting to be achieved. However, the success of the application of NF for the desalting is related, among other factors, with magnitude of the permeate fluxes decline. Here we show that the dye and salt concentration, the salt rejection and pressure applied are responsible for the decrease of flux values as well as for desalting purposes. We found in the process of desalination of aqueous dye-salt solutions by polymeric NF membranes that cake layer formation of dye molecules on membrane surface, especially at low salt concentrations, was the principal cause of flux decline. Our results demonstrate how the mathematical modelling of NF and description of discontinuous diafiltration by periodically adding solvent at constant pressure difference can be important for prediction of the diafiltration process in the manufacture of liquid dyes.
  • Diafiltration is used to allow a high level of desalting to be achieved. However, the success of the application of NF for the desalting is related, among other factors, with magnitude of the permeate fluxes decline. Here we show that the dye and salt concentration, the salt rejection and pressure applied are responsible for the decrease of flux values as well as for desalting purposes. We found in the process of desalination of aqueous dye-salt solutions by polymeric NF membranes that cake layer formation of dye molecules on membrane surface, especially at low salt concentrations, was the principal cause of flux decline. Our results demonstrate how the mathematical modelling of NF and description of discontinuous diafiltration by periodically adding solvent at constant pressure difference can be important for prediction of the diafiltration process in the manufacture of liquid dyes. (en)
Title
  • Comparison of NF membranes for desalination purpose and modelling of semi-batch diafiltration
  • Comparison of NF membranes for desalination purpose and modelling of semi-batch diafiltration (en)
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  • Comparison of NF membranes for desalination purpose and modelling of semi-batch diafiltration
  • Comparison of NF membranes for desalination purpose and modelling of semi-batch diafiltration (en)
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  • RIV/00216275:25310/10:39883083!RIV11-MSM-25310___
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  • Z(MSM0021627502)
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  • 251492
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  • RIV/00216275:25310/10:39883083
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  • Dye desalination; Reactive dyes; Diafiltration; Nanofiltration (en)
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  • [EC73BC81EB95]
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  • Praha
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  • Praha
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  • Proceedings of the19th International Congress of Chemical and Process Engineering
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  • Mikulášek, Petr
  • Cuhorka, Jiří
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number of pages
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  • Česká společnost chemického inženýrství
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  • 978-80-02-02250-3
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  • 25310
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