Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 7

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  pervaporation
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

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

100%
Kujawski W., Gierszewska-Drużyńska M., Warczok J., Güell C.
Polish Journal of Chemical Technology
|
2009
|
vol. 11
|
issue 2
41-45
EN
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.
2
Publication available in full text mode
Content available

Efficiency of acetone-butanol-ethanol-water system separation by pervaporation

100%
Marszałek J., Kamiński W.
Chemical and Process Engineering
|
2012
|
issue 1
3
Content available remote

Efficiency of acetone-butanol-ethanol-water system separation by pervaporation

100%
Marszałek J., Kamiński W.
|
|
vol. 33
|
issue 1
131-140
EN
The article focuses on multicomponent system separation with the use of an innovative membrane-based technique i.e. pervaporation. Pervaporation is a membrane technique for separation of liquid mixtures on solid nonporous membranes. Pervaporation is used in this study to separate a quaternary system acetone-butanol-ethanol-water. Such a system may be derived from ABE fermentation process, and the resulting product, biobutanol, is a potential biofuel and may be used in internal combustion engines.Experiments in the study involving concentration of butanol by pervaporation were performed using PERVAP 4060 flat-sheet commercial membrane. To describe the PV process a semi-empirical approach was used. As a result of experiments and calculations permeance coefficients were obtained. Separation and permeance factors were calculated to assess the efficiency of the system separation. Beforehand, activity coefficients were determined for all the components of the mixture with the NRTL equation. Separation coefficients for all the components differed depending on process parameters: concentration, feed flow rate and process temperature. The study confirmed the separation effect of the quaternary system. The most interesting results were obtained for the concentration of butanol. Pervaporation allows to concentrate butanol over 10 times. The permeance coefficient reached for butanol an average value of 7.06·10-3 in comparison with the results for ethanol 3.24·10-2 and acetone 1.83·10-2 [kmol(m2h)-1]. The temperature change from 50 to 70°C led to an increased permeance factor and there was no apparent effect on it in the feed flow rate. Due to the hydrophobicity of the membrane water fluxes in the quaternary system were negative.
4
Publication available in full text mode
Content available

INFLUENCE OF INITIAL STATE OF CHITOSAN MEMBRANES ON THEIR SEPARATION PROPERTIES IN PERVAPORATIVE DEHYDRATION

88%
Gnus M.
Progress on Chemistry and Application of Chitin and its Derivatives
|
2022
|
vol. 27
92-105
EN
In this study, membranes from chitosan with different molecular weights (175-230 kDa) and degree of deacetylation (92%-98%) were prepared and dehydration of a ethanol-water azeotropic mixture by pervaporation on membranes in the swollen and dry initial state was investigated. The influence of chitosan characteristics and the effect of the initial membrane state on separation properties are discussed. The structure of the obtained membranes changed during the drying process and affected the membrane transport parameters and time to membrane stabilisation. The impact of chitosan characteristics on the transport parameters depended on the initial membrane state. The chitosan molecular weight influenced ethanol transport, whereas the chitosan degree of deacetylation affected water transport. In addition, chitosan with the lowest molecular weight improved the separation properties of the membranes.
5
Publication available in full text mode
Content available

The influence of hydrodynamic conditions on the recovery of acetone, butanol and ethanol in pervaporation membrane modules

88%
Marszałek J., Tylman M., Rdzanek P., Kamiński W.
Chemical and Process Engineering
|
2018
|
vol. 39
|
issue 2
6
Publication available in full text mode
Content available

PERVAPORATIVE INVESTIGATION OF ETHYL ALCOHOL DEHYDRATION

88%
Gnus M., Dudek G., Turczyn R., Tórz A., Łącka D., Konieczny K., Łapkowski M.
Progress on Chemistry and Application of Chitin and its Derivatives
|
2015
|
vol. 20
54-63
EN
Pervaporative separation properties of crosslinked chitosan and alginate membrane on ethanol-water mixture at room temperature was studied. The influence of crosslinking agents on the separation properties were discussed. Selected crosslinking agents were affected differently on used polymer matrices. The better separation properties were obtained for membranes crosslinked by phosphoric (V) acid. The highest pervaporation separation index (309.6 kg/m2·h) and separation factor (52.6) were obtained for phosphoric (V) acid crosslinked alginate membranes, however, the greatest total flux (12.4 kg/m2·h) obtained for phosphoric acid crosslinked chitosan membranes
7
Publication available in full text mode
Content available

Pervaporation applied for dewatering of reaction mixture during esterification

75%
Krasiński A., Wierzba P., Grudzień A., Hajmowicz H., Zawada K., Synoradzki L.
Chemical and Process Engineering
|
2016
|
vol. 37
|
issue 1
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.