DEVELOPMENT OF A MIXED-MATRIX MEMBRANE FOR PERVAPORATION

1994-01-01
OKUMUS, E
GURKAN, T
Yılmaz, Levent
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
106
views
0
downloads
In the production of pure alcohol, pervaporation is developing into an important technology. In this study, in order to improve the performance of the pervaporation process, a mixed-matrix polymer-zeolite membrane is developed. In the preparation of these membranes, cellulose acetate as base polymer, acetone or DMF as solvent, and 13X or 4A zeolites as fillers were used. To test the performance of homogeneous and mixed-matrix membranes, a laboratory-scale pervaporation setup was constructed. The effect of the following experimental parameters on the selectivity and flux were experimentally studied to determine the optimum values of operating conditions and to understand the separation mechanism in the indicated ranges: feed concentration, 70-90 wt%; feed temperature, 30-70-degrees-C; feed flow rate, 32-76 L/h. It was observed that the addition of zeolite to the membrane matrix improves the flux value twofold with respect to its homogeneous membranes with some loss in their selectivity. For example, for a feed concentration of 74 wt% EtOH at 50-degrees-C and 1 mmHg, the flux value for the unfilled membrane is 0.6 L/m2.h, and for a 30% zeolite-filled membrane, the flux is increased to 1.33. For these cases, the selectivities are 7.76 and 5.0 for the unfilled and filled membranes, respectively. TEM micrographs of the mixed-matrix membranes show a homogeneous distribution of zeolite particles which produce a cave-like porous structure in the matrix. The combined effect of this modified morphology and zeolite selectivity is the possible reason for the observed pervaporation performances of mixed-matrix membranes.
Filtration and Separation, Process Chemistry and Technology, General Chemistry, General Chemical Engineering
https://hdl.handle.net/11511/41986
SEPARATION SCIENCE AND TECHNOLOGY
Department of Chemical Engineering, Article

Suggestions

Treatment by nanofiltration of the bleed stream of a continuous alcohol fermentor
Aydogan, N; Gurkan, T; Yılmaz, Levent (Informa UK Limited, 2004-01-01)
In continuous ethanol fermentation processes, which include product removal and recovery steps, to limit the concentration of secondary products, a bleed stream may be used. This stream contains several small molecular weight organic fermentation products and substrate sugars. To recover sugars and to minimize the amount of waste, the bleed stream is treated by nanofiltration. Three types of membranes were used in these experiments: 500 and 200 mwco (molecular weight cut off) polyamide and a thin-film compo...
Removal of hexavalent chromium anions via polymer enhanced ultrafiltration using a fully ionized polyelectrolyte
HAKTANIR, CEREN; Ozbelge, H. Onder; Bicak, Niyazi; Yılmaz, Levent (Informa UK Limited, 2017-01-01)
A fully ionized polyelectrolyte was synthesized for Cr(VI) removal from aqueous solutions by continuous polymer enhanced ultrafiltration (PEUF). Effect of operating parameters such as pH, loading, polymer, and competing ion concentrations were examined. Highest Cr(VI) retention was obtained at a loading of 0.01 at pH 4. Increasing both polymer and chromate concentrations at a fixed loading of 0.01 decreased the retention which demonstrated the effect of crowding. In the presence of competing anions such as ...
Effect of operating parameters on the separation of sugars by nanofiltration
Aydogan, N; Gurkan, T; Yılmaz, Levent (Informa UK Limited, 1998-01-01)
Due to the complexity of fermentation mixtures, separation of solutes and secondary substrates has a special importance. Membrane processes such as nanofiltration may offer good alternatives for the separation of fermentation products or recovery of substrates. For an efficient separation, the membrane type and operating parameters such as feed flow rate, operating pressure, and feed should be optimized. In this study the separation and recovery of sugars were targeted. It was found that with an increase of...
Development of a synthetic strategy for Water soluble tripodal receptors: Two novel fluorescent receptors for highly selective and sensitive detections of Fe3+ and Cu2+ ions and biological evaluation
USLU, AYLİN; Ozcan, Elif; TÜMAY, SÜREYYA OĞUZ; Kazan, Hasan Huseyin; YEŞİLOT, SERKAN (Elsevier BV, 2020-04-01)
A general synthetic strategy is developed to synthesize water soluble receptors by employing tripodal system based on a cyclotriphosphaze platform. The developed model is successfully synthesized and characterized by using elemental analysis, FT-IR, MALDI-TOF, H-1 NMR, C-13 NMR and P-31 NMR techniques. The fluorescence sensing performance of prepared water soluble tripodal systems were evaluated by UV/Vis and fluorescence spectroscopies. According to obtained results, two novel water-soluble sensing platfor...
Use of biodiesel byproduct crude glycerol as the carbon source for fermentation processes by recombinant Pichia pastoris
Celik, Eda; Ozbay, Nalan; OKTAR, NURAY; Çalık, Pınar (American Chemical Society (ACS), 2008-05-07)
The aim of this study is to investigate the efficiency of using crude glycerol, the main byproduct of biodiesel industry, directly in the production media of Pichia pastoris fermentation processes. Different biodiesel synthesis conditions were examined, that is, transesterifications of canola, corn, soybean, and sunflower oils, with pure methanol in a molar ratio of 1:6 or 1:3, using 1% or 0.5% (w/v) NaOH as the catalyst. Among these, canola oil-derived glycerol served as the most favorable carbon source, a...
Citation Formats
E. OKUMUS, T. GURKAN, and L. Yılmaz, “DEVELOPMENT OF A MIXED-MATRIX MEMBRANE FOR PERVAPORATION,” SEPARATION SCIENCE AND TECHNOLOGY, pp. 2451–2473, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41986.
METU IIS - Integrated Information Service open@metu.edu.tr