Deep desalination of water by evaporation through polymeric membranes

Kuznetsov, Yu. P.; Kruchinina, E. V.; Baklagina, Yu. G.; Хрипунов, А. К.; Tulupova, O. A.

doi:10.1134/s1070427207050199

Cited by 42 publications

(21 citation statements)

References 5 publications

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“…Pervaporation has been extensively used for separation or concentration of mixtures of aqueous-organic or organic liquids. During the last decade, systematic studies on desalination using high-chemical-stability dense pervaporation membranes were conducted [2,3,4]. The pervaporation of an aqueous salt solution can be regarded as separation of a pseudo-liquid mixture containing free water molecules and bulkier hydrated ions formed in solution upon dissociation of the salt in water [2].…”

Section: Introductionmentioning

confidence: 99%

“…During the last decade, systematic studies on desalination using high-chemical-stability dense pervaporation membranes were conducted [2,3,4]. The pervaporation of an aqueous salt solution can be regarded as separation of a pseudo-liquid mixture containing free water molecules and bulkier hydrated ions formed in solution upon dissociation of the salt in water [2]. In desalination applications, pervaporation has the advantages of near 100% salt rejection and the energy need is independent of the salt concentration [4].…”

Section: Introductionmentioning

confidence: 99%

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Effect of heat treatment on pervaporation separation of aqueous salt solution using hybrid PVA/MA/TEOS membrane

Xie

Hoang

et al. 2014

Separation and Purification Technology

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Heat treatment is believed to be an important step in controlling the morphology and properties of polymer based membranes. In this study, hybrid organic-inorganic membrane based on poly(vinyl alcohol) (PVA), maleic acid (MA) and tetraethyl orthosilicate (TEOS) was synthesised via a sol-gel route. The effects of heating temperature and heating time on pervaporation separation performance of aqueous salt solution were studied in relation to swelling and hydrophilic properties, the free volume, salt transport properties, and water diffusivity of the membrane. The free volume of the hybrid membrane under different heat treatment conditions were well correlated with the pervaporation testing results. With increasing heating temperature or time, the fractional free volume of the hybrid membrane was reduced due to a more compact structure by crosslinking among PVA, MA and TEOS. As a result, the water flux decreased and the salt rejection increased. The salt transport properties followed a similar trend as the water uptake, indicating the hydrated NaCl was solvated by water in the membrane phase.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on pervaporation separation of aqueous salt solution using hybrid PVA/MA/TEOS membrane

Xie

Hoang

et al. 2014

Separation and Purification Technology

View full text Add to dashboard Cite

show abstract

“…However, there are only limited studies on application of this technology for water desalination [2,3]. In desalination applications, pervaporation has the advantage of near 100% of salt rejection and potential low energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…In desalination applications, pervaporation has the advantage of near 100% of salt rejection and potential low energy consumption. The pervaporation of an aqueous salt solution can be regarded as separation of a pseudo-liquid mixture containing free water molecules and bulkier hydrated ions formed in solution upon dissociation of the salt in water [2]. A summary of previously reported open literature on desalination by pervaporation is presented in Table 1 [4].…”

Section: Introductionmentioning

confidence: 99%

“…In order to ensure continuous mass transport, very low absolute pressures are usually maintained on the downstream side of the membrane, removing all molecules migrating to the surface, and thus rendering a concentration difference across the membrane [1]. The mechanism of mass transfer of liquids across non-porous polymeric membranes includes successive stages of sorption of a liquid and its diffusion through the free volume of the polymeric material [2].…”

Section: Introductionmentioning

confidence: 99%

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Separation of aqueous salt solution by pervaporation through hybrid organic–inorganic membrane: Effect of operating conditions

et al. 2011

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Hybrid polymer-inorganic membranes were prepared by crosslinking poly(vinyl alcohol) (PVA), maleic acid (MA) and silica via an aqueous sol-gel route. Membrane characterisation results revealed silica nanoparticles (<10 nm) were well dispersed in the polymer matrix and significantly reduced swelling of the membrane. The membranes were tested for pervaporation separation of aqueous salt solution with NaCl concentrations of 0.2-5.0 wt% at temperatures 20-65°C, feed flowrates 30-150 mL/min and permeate pressures 2-40 Torr. The salt rejection remained high (up to 99.9%) under all operating conditions. A high water flux of 11.7 kg/m 2 ·hr could be achieved at a feed temperature of 65°C and a vacuum of 6 Torr. The effect of operating conditions on water flux is discussed in relation to diffusion coefficients of water and fundamental transport mechanism through the membrane. The activation energy for water permeation was found to vary from 23.8 to 20.1 kJ/kmol when the salt concentration in the feed was increased from 0.2 to 5.0 wt%.

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Complete desalination of seawater using a novel polyvinylidene fluoride/zeolite membrane

Nigiz

2017

Environ Chem Lett

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Deep desalination of water by evaporation through polymeric membranes

Cited by 42 publications

References 5 publications

Effect of heat treatment on pervaporation separation of aqueous salt solution using hybrid PVA/MA/TEOS membrane

Effect of heat treatment on pervaporation separation of aqueous salt solution using hybrid PVA/MA/TEOS membrane

Separation of aqueous salt solution by pervaporation through hybrid organic–inorganic membrane: Effect of operating conditions

Complete desalination of seawater using a novel polyvinylidene fluoride/zeolite membrane

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