Polyheptylmethylsiloxane—A Novel Material for Removal of Oxygenates from Water by Pervaporation

Грушевенко, Е. А.; Podtynnikov, I. A.; Golubev, G. S.; Volkov, V. V.; Borisov, Ilya L.

doi:10.1134/s0965544118110026

Cited by 13 publications

(12 citation statements)

References 30 publications

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“…As can be seen, the kinetic diameter of MTBE molecules is larger than for water by a factor of 2.5, and, consequently, the diffusion selectivity of MTBE/water shall be lower than 1. However, the polyalkylmethylsiloxanes demonstrate greater affinity to organic components over the water molecules and showed high selectivity in pervaporative recovery of organics from aqueous solutions since the sorption selectivity plays a major role in the overall selectivity of pervaporation process [ 38 , 39 , 40 ]. Such affinity between the polymer and water or MTBE was evaluated by using the distance parameters calculated from the Hansen solubility group parameters (δ) [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

“…The increase in the selectivity of silicone rubbers could be achieved by introducing hydrophobic zeolites into the polymer matrix [ 36 ], co-polymerization of dimethylsiloxane with more hydrophobic monomers [ 37 ], as well as the introduction of hydrophobic substituents into the main and side-chain of the polymer [ 23 , 38 , 39 , 40 ]. For example, polyheptylmethylsiloxane demonstrates a significantly higher n-butanol-water separation factor (97) compared to PDMS (38) [ 38 ]. Consequently, the development of highly permeable membranes based on polysiloxanes with increased hydrophobicity is a promising direction for solving the problem of removal MTBE from water.…”

Section: Introductionmentioning

confidence: 99%

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High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

et al. 2020

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For the first time, the effect of the side-chain in polyalkylmethylsiloxane towards pervaporative removal of methyl tert-butyl ether (MTBE) from water was studied. The noticeable enhancement of separation factor during the pervaporation of 1 wt.% MTBE solution in water through the dense film (40–50 µm) can be achieved by substitution of a methyl group (separation factor 111) for heptyl (161), octyl (169) or decyl (180) one in polyalkylmethylsiloxane. Composite membrane with the selective layer (~8 µm) made of polydecylmethylsiloxane (M10) on top of microfiltration support (MFFK membrane) demonstrated MTBE/water separation factor of 310, which was 72% greater than for the dense film (180). A high separation factor together with an overall flux of 0.82 kg·m−2·h−1 allowed this M10/MFFK composite membrane to outperform the commercial composite membranes. The analysis of the concentration polarization modulus and the boundary layer thickness revealed that the feed flow velocity should be gradually increased from 5 cm·s−1 for an initial solution (1 wt.% of MTBE in water) to 13 cm·s−1 for a depleted solution (0.2 wt.% of MTBE in water) to overcome the concentration polarization phenomena in case of composite membrane M10/MFFK (Texp = 50 °C).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

et al. 2020

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“…A promising technique for imparting increased selectivity for organic components to polysiloxanes is the introduction of hydrophobic hydrocarbon moieties into their structure [179,180]. Thus, to recover alcohols from aqueous effluents by pervaporation, a new membrane made of polymethylsiloxane bearing 1-heptene as substituent in side chains has been created [180]. It has been shown that polyheptylmethylsiloxane is the most promising membrane material for the pervaporative separation of water-butanol mixtures.…”

Section: Developments Of Membrane Materials For Pervaporation Processmentioning

confidence: 99%

Prospects of Membrane Science Development

Apel

Бобрешова

Волков

et al. 2019

Membr. Membr. Technol.

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123

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Membranes are widely used in modern technology. The demand for different types of membranes and membrane processes is increasing every year. This review summarizes the current state of the art and prospects of membrane science developments including membrane materials for gas separation, pervaporation, and pressure-driven membrane processes; ion-exchange, hybrid, and track-etched membranes; membranes for electrochemical sensors; and mathematical modeling of membrane separation processes and ion and water transport in membrane systems. Studies aimed at improving the selectivity and performance of membranes and their stability are surveyed. New approaches to the synthesis and modification of membranes as well as their advanced applications are discussed.

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“…Such a post-treatment procedure was necessary to plug the defects in the thin dense skin layer. It is worth noting that new rubbery polymer materials for gas separation have appeared since then [26,27].…”

Section: Asymmetric Hollow-fiber Spinning and Characterizationmentioning

confidence: 99%

High-Pressure Aging of Asymmetric Torlon® Hollow Fibers for Helium Separation from Natural Gas

Dibrov

Ivanov

Semyashkin

et al. 2018

Fibers

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Membrane separation for helium extraction from natural gas gained increased interest recently. Several vendors offer membrane elements for helium extraction, although data on their performance and operating experience are unpublished. The aim of this work was to obtain and study the separation performance of asymmetric hollow-fiber membrane element from commercial polyamide-imide Torlon®, in conditions close to the industrial process of helium extraction from natural gas. A membrane element with an active area of 0.177 m2, a helium permeance of 100 l(STP)/(m2·h·bar), and a selectivity α(He/CH4) = 340 was produced. This corresponds to a selective layer thickness of 82.3 nm, which was confirmed by SEM and resistance model calculations. The obtained membrane element was employed to decrease the concentration of helium in its binary mixture with methane from 0.4% to 0.05%. A relationship of separation characteristics from transmembrane pressure is also presented. At 70 bar and a stage cut of 2.7%, the feed flow rate was 0.16 m3(STP)/h, which yielded a helium permeate concentration of 14.7%. At 80 bar, a decrease in permeance to 60 l(STP)/(m2·h·bar) and in selectivity to 240 was observed. It was shown that the main reason for aging was the increased support resistance, due to a partial compaction of pores with a radius of less than 15 nm.

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Polyheptylmethylsiloxane—A Novel Material for Removal of Oxygenates from Water by Pervaporation

Cited by 13 publications

References 30 publications

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

Prospects of Membrane Science Development

High-Pressure Aging of Asymmetric Torlon® Hollow Fibers for Helium Separation from Natural Gas

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