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Öğe Crosslinked sodium alginate and sodium alginate-clinoptilolite (natural zeolite) composite membranes for pervaporation separation of dimethylformamide-water mixtures: A comparative study(Desalination Publications, 2011) Kahya, Suat; Şanlı, Oya; Çamurlu, Hasan ErdemPervaporation performance of crosslinked composite membranes of clinoptilolite (Clt) and sodium alginate (NaAlg) has been studied for the separation of dimethylformamide (DMF)/water mixtures. The effects of feed composition (0-100 wt. %) and operating temperature (20-50 degrees C) on the permeation rates and the separation factors were investigated. The observed flux values of composite membranes were much higher whereas the selectivities were lower than the plain NaAlg membranes. The highest permeation rate of 2.3 kg/m(2)h and selectivity of 23 was exhibited by the composite membranes depending on the operating conditions and Clt loading. In addition sorption-diffusion properties of the composite membranes were investigated at the operating temperatures and the feed compositions. It was found that the sorption selectivity was dominant factor for the separating of DMF/water mixtures for both types of membranes. The membranes were characterized by Fourier transform infrared spectrometry (FTIR), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM).Öğe Polimerik Membranlarda zeolit kullanımının pervaporasyon performansı üzerine etkisinin incelenmesi(Bilecik Şeyh Edebali Üniversitesi, 2022) Kahya, SuatBu çalışmada, pervaporasyon yöntemiyle dimetilformamit/su karışımının ayrılması amacıyla sodyum aljinat/poli (vinil alkol)/klinoptilolit kompozit membran elde edilmiştir. Çapraz bağlı membranlar, (FTIR), diferansiyel taramalı kalorimetre (DSC), termal gravimetrik analiz (TGA) ve taramalı elektron mikroskobu (SEM) cihazları ile karakterize edilmiştir. Akı değeri (3,266 kg/m2 sa) yüksek bulunmasına karşın, seçicilik için arzulanan sonuca ulaşılamamıştır. Ağırlıkça % 20 DMF çözeltisi için aktivasyon enerjisi 3,720 kcal/mol olarak ölçülmüştür. Zeolit ilavesinin membran performansına etkisi araştırılmıştır.Öğe Separation characteristics of acetone/water mixtures through sodium alginate/poly(vinyl pyrrolidone) membranes by vapor permeation and vapor permeation with temperature difference methods(Desalination Publications, 2011) Solak, Ebru Kondolot; Kahya, Suat; Şanlı, OyaIn this study the permeation and separation characteristics of acetone/water mixtures were investigated by vapor permeation (VP) and vapor permeation with temperature difference (TDVP) methods using sodium alginate/poly (vinyl pyrrolidone) (NaAlg/PVP) membranes crosslinked with calcium chloride. Membranes were prepared in different ratios (w/w) (100/0, 95/5, 90/10, 85/15, 80/20, 75/25) of NaAlg/PVP. The effects of blend ratio, feed composition, operating temperature and temperature of the membrane surroundings on the separation characteristics (separation factor, permeation rate) were studied for the acetone/water mixtures. The optimum NaAlg/PVP ratio, operating temperature and feed composition were determined as 75/25 (w/w), 40 degrees C, and 20 wt% acetone, respectively. The separation factors decreased whereas permeation rates increased with the increase in permeation temperature for both VP and TDVP methods. In the TDVP method separation factors increased and the permeation rates decreased as the temperature of the membrane surroundings decreased. It was as observed that the permeation rate in TDVP method was lower than in VP; however the highest separation factor was obtained with TDVP method as 73.Öğe Separation of dimethylformamide/water mixtures through sodium alginate and sodium alginate/clinoptilolite composite membranes by vapor permeation with and without feed-membrane temperature difference(TAYLOR & FRANCIS INC, 2014) Kahya, Suat; Şanlı, OyaThe characteristics of permeation and separation of dimethylformamide (DMF)/water mixtures through crosslinked sodium alginate (NaAlg) and NaAlg/clinoptilolite (Clt) composite membranes were investigated by vapor permeation (VP) and vapor permeation with temperature-difference (TDVP) techniques. The effects of Clt content of the membrane, feed composition, permeation temperature, and membrane surrounding temperature on the permeation rates and the separation factors were studied. Permeation rates in VP and TDVP were found 0.03-0.41 kg/m(2) h and 0.10-0.45 kg/m(2) h, respectively. Separation factors were increased up to a certain content of zeolite (%15) than decreased, and higher separation factor was obtained in TDVP method (68.80) as compared to VP. Activation energy of permeation in VP was calculated to be 2.794 kcal/mol for 20 wt.% DMF solution.Öğe Sodium alginate/poly(vinyl alcohol) alloy membranes for the pervaporation, vapour permeation and vapour permeation with temperature difference separation of dimethylformamide/water mixtures: A comparative study(PERGAMON-ELSEVIER SCIENCE, 2010) Kahya, Suat; Solak Kondolot, Ebru; Şanlı, OyaIn this study, sodium alginate (NaAlg)/poly(vinyl alcohol) (PVA) membranes were prepared for the separation of dimethylformamide (DMF)/water mixtures. The two polymer components were independently crosslinked chemically with glutaraldehyde. The crosslinked membranes were characterized by fourier transform infrared spectrometry (FTIR), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). The permeation and separation characteristics of water/DMF mixtures were investigated using the vacuum processes pervaporation (PV), vapour permeation (VP) and vapour permeation with temperature difference (TDVP) methods. The effects of NaAlg/PVA ratio, membrane thickness, operating temperature and temperature of the membrane surroundings, feed concentration on the transmembrane permeation rate and separation factor were investigated. Optimum NaAlg/PVA ratio was determined as 80/20 (w/w) for the separation. The permeation rate in VP was lower than those in PV, whereas the separation factors were higher. The activation energies of permeation in PV and VP were calculated to be 5.070 and 2.229 kcal/mol, respectively, for a 20 wt% of DMF solution.
