Ethanol purification from methanol via pervaporation using polybеnzoхazinonеimidе membrane

Pulyalina, Alexandra; Polotskaya, G. A.; Veremeychik, Кseniya Yu.; Goĭkhman, M. Ya.; Podeshvo, I. V.; Тойкка, А. М.

doi:10.1016/j.fuproc.2015.07.023

Cited by 24 publications

(7 citation statements)

References 27 publications

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“…Vapor has a higher diffusion rate than liquid, so diffusion and the total flux increases. As a result, the high diffusion rate of pentyl acetate causes a high flux and low pentyl acetate separation factor …”

Section: Resultsmentioning

confidence: 99%

“…As a result, the high diffusion rate of pentyl acetate causes a high flux and low pentyl acetate separation factor. [33][34][35][36] The mass transfer coefficient and sorption properties of components increase with operation temperature. The driving force and saturated vapor pressure of components increase with operation temperature.…”

Section: Effect Of Process Temperaturementioning

confidence: 99%

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Concentration of aroma compounds by pervaporation process using polyvinyl chloride membrane

Ünlü

2019

Flavour & Fragrance J

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The organoleptic properties of beverage products have an important role in consumption and commercial success. Nowadays aroma recovery with high efficiency is an important process. Hydrophobic pervaporation is an alternative process for the recovery of aroma compounds in the food industry. The purpose of this study was to determine the effects of operation temperature, feed concentration, and driving force on the recovery of different aroma compounds such as propyl acetate, pentyl acetate, and octyl acetate by pervaporation. Pervaporation was operated using a Polyvinyl Chloride hydrophobic membrane. As the process temperature and the feed concentration increased, the flux increased, but separation factor values of binary aqueous solutions of the aroma components propyl acetate, pentyl acetate, and octyl acetate decreased. Polyvinyl Chloride possessed a higher separation factor value for propyl acetate than octyl acetate and pentyl acetate. This situation was also confirmed with swelling tests and solubility parameters. Low‐swelling degree results in a high separation factor. The highest separation success was observed for propyl acetate. The flux and separation factor of propyl acetate were obtained as 1.57 kg m−2 h−1 and 158, respectively. It has been found that the pervaporation is an efficient process for aroma recovery from water and that the polyvinyl chloride membrane exhibits good separation performance from the removal of propyl acetate, pentyl acetate, and octyl acetate from the water.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Process Temperaturementioning

confidence: 99%

Concentration of aroma compounds by pervaporation process using polyvinyl chloride membrane

Ünlü

2019

Flavour & Fragrance J

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“…One significant advantage of the PBOI prepolymer (imide-containing polyamic acid) is its high hydrolytic stability as compared to that of polyimide prepolymer. PBOIs and their three prepolymers of different structures have been investigated as nonporous films only for gas separation and pervaporation [28,29,30]. It has been shown that the composite membranes including the selective layer of the PBOI prepolymer possess effective dehydrating properties in the pervaporation of water–organic mixtures; besides, they are highly selective in separating industrially important O 2 /N 2 and H 2 /N 2 gas pairs.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Membranes Based on Copolyheteroarylenes with Imide, Biquinoline, and Oxazinone Units: Formation and Characterization

et al. 2019

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Modern ultrafiltration requires novel perfect membranes with narrow pore size, high porosity, and minimal pore tortuosity to achieve high separation performance. In this work, copolyamic acid (co-PAA) was synthesized and used for the preparation of asymmetric porous membranes by phase inversion technique. Several co-PAA membranes were heated up to 250 °C; during heating, they undergo solid-phase transformation into co-polybenzoxazinoneimide (co-PBOI) via dehydration and cyclization. Comparative characterization of both co-PAA and co-PBOI membranes was realized by scanning electron microscopy, mechanical testing, thermogravimetric analysis, and ultrafiltration experiments. Membrane calibration was carried out using a mixture of seven proteins with different molecular weights. During heat treatment, the molecular weight cut-off of the membranes decreased from 20 × 103 g/mol (co-PAA) to 3 × 103 g/mol (co-PBOI). Abnormally low dispersions of rejection (0.3 for co-PAA and 0.45 for co-PBOI) were observed for the studied membranes; this fact indicates that the membranes possess enhanced resolving power.

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“…In the recent years, polyheteroarylenes containing imide and oxazinone fragments in the backbone have attracted attention of researchers as membrane materials for gas separation and pervaporation. Two main polymers of this group of polyheteroarylenes, namely, imide-containing polyamic acids and polybenzoxazinoneimides, have been studied in native form and as polymer-metal complexes with copper (Cu(I)) 24–28 . Application of polymer-metal complexes as membrane materials offers interesting prospects in membrane processes.…”

Section: Introductionmentioning

confidence: 99%

Novel Polyheteroarylene Membranes for Separation of Methanol‒Hexane Mixture by Pervaporation

Polotskaya

Pulyalina

Goĭkhman

et al. 2018

Sci Rep

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Polymer membranes with improved transport properties are required for effective separation of organic mixtures (such as methanol‒hexane system) by combination of pervaporation and azeotropic distillation. The present work is devoted to comparative study of two types of membranes based on poly(amidoimide acid) with 2,2′-biquinoline-6,6′ units in the backbone; the objects were prepared (i) from the initial polymer and (ii) from the polymer-metal complex (with Cu(I)). Thermo-mechanical and mass spectrometric investigations demonstrated good operational properties of the samples. Density measurements and SEM analysis revealed that the structure formed in polymer-metal complex is more compact as compared to that of the pure polymer membrane. Mass transfer processes of methanol and hexane through both kinds of membranes were studied by sorption, desorption and pervaporation tests. The values of equilibrium sorption degree, the Flory–Huggins parameter, and diffusion coefficient were determined for the obtained membranes. The pervaporation data allowed calculating permeability and selectivity of membranes in addition to the flux and the separation factor. The membrane based on polymer-Cu(I) complex allowed separating the methanol‒hexane azeotropic mixture with a separation factor of 980 and pervaporation separation index equal to 66.6; therefore, this process is significantly more effective than separation procedures involving other known membranes.

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Ethanol purification from methanol via pervaporation using polybеnzoхazinonеimidе membrane

Cited by 24 publications

References 27 publications

Concentration of aroma compounds by pervaporation process using polyvinyl chloride membrane

Concentration of aroma compounds by pervaporation process using polyvinyl chloride membrane

Asymmetric Membranes Based on Copolyheteroarylenes with Imide, Biquinoline, and Oxazinone Units: Formation and Characterization

Novel Polyheteroarylene Membranes for Separation of Methanol‒Hexane Mixture by Pervaporation

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