Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Chemical Technology

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: destylacja osmotyczna

Sortuj według:

Ogranicz wyniki do:

Application of pervaporation and osmotic membrane distillation to the regeneration of spent solutions from the osmotic food dehydration

Kujawski W., Gierszewska-Drużyńska M., Warczok J., Güell C.

Polish Journal of Chemical Technology

2009

Vol. 11, nr 2

41-45

Results of pervaporation (PV) of sucrose and calcium chloride spent solutions were presented. Additionally, osmotic membrane distillation (OMD) of sucrose solutions was investigated. It was found that the regeneration of spent sucrose solution for the reuse is possible by using PV or OMD processes. However, OMD process produces another spent stream i.e. CaCl2. Pervaporation membranes showed fluxes in the range of 0.5 - 0.9 kg m^-2 h^-1 in contact with 40° Brix sucrose solution, whereas OMD water permeate fluxes were in the range of 4 - 5 kg m^-2 h^-1 for the same feed concentration. Two different hybrid processes were suggested: i) pretreatment followed by OMD reconcentration of spent sucrose solution and independently PV for CaCl2 regeneration; ii) membrane pretreatment (MP) followed by PV of sucrose solution. Based on the experimental results, the membrane areas for both systems were calculated and compared. MP-PV system seems to be a better solution for the spent mixtures management.

The influence of the process parameters on the permeate flux in the osmotic membrane distillation

Sasim M., Gryta M.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 2

12-15

Osmotic membrane distillation is a novel variant of membrane distillation process proposed for the removal of water from dilute aqueous solutions, such as liquid foods. The effect of various process parameters, such as the concentration, the flow rates and the temperature of the feed and the osmotic solution on the permeate flux was evaluated. The NaCl and CaCl2 salts were used as a solute for the preparation of the osmotic solution. The hydrophobic capillary polypropylene membranes were used in these studies. Within the tested range of the process parameters the permeate fluxes can be significantly improved (over two-fold) by: replacing the NaCl by CaCl2 solution and enhancing the process temperature from 298 to 313 K or heating the feed by 5 K over the temperature of the osmotic solution. Smaller influence was found to stream the flow rates, the permeate flux increases by 15% when the flow increased by five-fold.