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Development of mesoporous carbon incorporated hybrid membranes for separation of azeotropic mixtures by pervaporation
Author(s) -
Gosar N.S.,
Premakshi H.G.,
Kariduraganavar M.Y.
Publication year - 2018
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.24587
Subject(s) - pervaporation , membrane , materials science , differential scanning calorimetry , chemical engineering , endothermic process , sorption , thermogravimetry , vinyl alcohol , thermogravimetric analysis , permeation , analytical chemistry (journal) , polymer chemistry , chromatography , adsorption , organic chemistry , chemistry , polymer , composite material , thermodynamics , biochemistry , physics , engineering
Using a solution technique, tetraethylorthosilicate crosslinked hybrid poly(vinyl alcohol) membrane was prepared. The membrane was further incorporated with 0, 10, 20, and 30 mass% of mesoporous carbon and the membranes thus obtained were designated as M‐1, M‐2, M‐3, and M‐4, respectively. The physico‐chemical properties of these membranes were investigated using Fourier transform infrared spectroscopy, wide‐angle X‐ray diffraction, differential scanning calorimetry, thermogravimetry analysis, and scanning electron microscopy. The effects of mesoporous carbon and feed composition on pervaporation performance of the membranes were systematically investigated. The membrane M‐4 exhibited the highest separation factor of 4,082 with a flux of 1.93 × 10 −2 kg/m 2 h at 30°C for 10 mass% of water in the feed. Total flux and flux of water are overlapping each other, manifesting that these membranes could be used to break the azeotropic point of water‐isopropanol mixtures effectively. From the temperature dependent diffusion and permeation values, the Arrhenius activation parameters were estimated. The positive heat of sorption values was obtained for M‐1, M‐2, and M‐3, suggesting that Henry's mode of sorption is predominant, giving an endothermic contribution. On the contrary, membrane M‐4 exhibited negative Δ H s value suggesting that the sorption process was dominated by exothermic contribution. POLYM. ENG. SCI., 58:405–415, 2018. © 2017 Society of Plastics Engineers