Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

Castro-Muñoz, Roberto; Boczkaj, Grzegorz

doi:10.3390/molecules26051242

Cited by 24 publications

(5 citation statements)

References 98 publications

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“…It can substitute conventional methods, such as liquid-liquid extraction and distillation, which are difficult or costly in the purification of mixtures [103]. The PV process mainly depends on the use of a membrane with high potential for purifying substances that degrade/decompose at high temperatures, downstream of which a pressure gradient (vacuum) is applied to promote the diffusion and transfer of substances [104][105][106].…”

Section: Pervaporation (Pv)mentioning

confidence: 99%

Research Progress on Extraction, Separation, and Purification Methods of Plant Essential Oils

Zhou,

Li,

Wang

et al. 2023

Separations

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Essential oils (EOs), also called liquid gold, are known for their wide range of applications and biological activities. The modern use of EOs has received increasing attention for more than 60 years. The precious EOs have been refined from plant raw materials using a variety of methods. Since the extraction, separation, and purification methods determine the type, quantity, and stereochemical structure of EO molecules as well as the final yield and quality of EOs, the selection of an appropriate method is crucial. The traditional and emerging extraction methods (hydrodistillation, steam distillation, organic solvent extraction, etc.), as well as separation and purification methods (chromatography, macroporous resin, chemical reaction, etc.), of plant EOs and their main volatile compounds were shown. Our review focused on the principles, processes, characteristics, and applications of these methods, so as to better understand the preparation of pure plant EOs and further guide their large-scale use.

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Section: Pervaporation (Pv)mentioning

confidence: 99%

Research Progress on Extraction, Separation, and Purification Methods of Plant Essential Oils

Zhou,

Li,

Wang

et al. 2023

Separations

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“…Zeolites are crystalline aluminosilicate materials composed of primary elements, including potassium, sodium, magnesium, and calcium [ 42 ]. High void volume, elevated surface area, and uniform distribution of pore size led them to be tested as fillers of polymer matrix for membrane-based methods [ 43 ]. The introduction of zeolites makes it possible to reduce polymer swelling and enhance the dehydration performance of PV membranes.…”

Section: Membranes For Eg Dehydrationmentioning

confidence: 99%

A Review of Recent Developments of Pervaporation Membranes for Ethylene Glycol Purification

2022

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Ethylene glycol (EG) is an essential reagent in the chemical industry including polyester and antifreeze manufacture. In view of the constantly expanding field of EG applications, the search for and implementation of novel economical and environmentally friendly technologies for the separation of organic and aqueous–organic solutions remain an issue. Pervaporation is currently known to significantly reduce the energy and resource consumption of a manufacturer when obtaining high-purity components using automatic, easily scalable, and compact equipment. This review provides an overview of the current research and advances in the pervaporation of EG-containing mixtures (water/EG and methanol/EG), as well as a detailed analysis of the relationship of pervaporation performance with the membrane structure and properties of membrane materials. It is discussed that a controlled change in the structure and transport properties of a membrane is possible using modification methods such as treatment with organic solvents, introduction of nonvolatile additives, polymer blending, crosslinking, and heat treatment. The use of various modifiers is also described, and a particularly positive effect of membrane modification on the separation selectivity is highlighted. Among various polymers, hydrophilic PVA-based membranes stand out for optimal transport properties that they offer for EG dehydrating. Fabricating of TFC membranes with a microporous support layer appears to be a viable approach to the development of productivity without selectivity loss. Special attention is given to the recovery of methanol from EG, including extensive studies of the separation performance of polymer membranes. Membranes based on a CS/PVP blend with inorganic modifiers are specifically promising for methanol removal. With regard to polymer wettability properties, it is worth mentioning that membranes based on hydrophobic polymers (e.g., SPEEK, PBI/PEI, PEC, PPO) are capable of exhibiting much higher selectivity due to diffusion limitations.

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“…The advent of organic–inorganic hybrid materials, blending the high permeability of inorganic substances with the hydrophobicity of organic materials, has led to the creation of composite selective layers that enhance the separation performance of PV membranes. Various inorganic particles, including zeolitic imidazolate frameworks (ZIFs), , zeolites, , silica, , and graphene, , have been incorporated into the polymer matrix, demonstrating improved separation performance in these hybrid membranes with the addition of inorganic particles. Therefore, enhancing the separation factor of PDMDES membranes by incorporating hydrophobic inorganic particles into their matrixes can be a promising strategy.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Pervaporation Performance for Alcohol Recovery from Aqueous Solutions with Silicalite-1/Polydimethyldiethoxysilane (PDMDES) Nanocomposite Membranes

Chen,

Li,

et al. 2023

Ind. Eng. Chem. Res.

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This study presented a newly prepared silicalite-1/ polydimethyldiethoxysilane (PDMDES) nanocomposite membrane through the incorporation of nanosized silicalite-1 particles to enhance the pervaporation performance for alcohol recovery from aqueous solutions. Preheating was strategically employed to facilitate the formation of chemical bonds between silicalite-1 and the cross-linking agent vinyltriethoxysilane (VTES), thereby improving the compatibility between silicalite-1 and the PDMDES polymer. Comprehensive characterizations including FT-IR, XRD, TGA, and CA demonstrated a notable increase in hydrophobicity and thermal stability, attributable to the well-incorporated silicalite-1 nanoparticles. FE-SEM observation revealed two distinct cross-sectional morphologies of the nanocomposite membrane: a dense packed structure with uniformly dispersed silicalite-1 nanoparticles within the PDMDES polymer matrix and a loosely accumulated structure where silicalite-1 was adhered by the PDMDES polymer. This phenomenon was linked to the low viscosity of PDMDES during the membrane preparation, which also resulted in the actual loading of silicalite-1 in the prepared nanocomposite membranes being higher than the intended one. The separation performance, influenced by silicalite-1 loading, operating temperature, and feed concentration, was thoroughly evaluated. Accordingly, the separation factor was enhanced by 90% compared to pure PDMDES membrane, and the optimal pervaporation performance was achieved with a 10 wt % silicalite-1 loading in the nanocomposite membrane, manifesting a high total flux of 5.72 kg m −2 h −1 , a PSI of 31.36 kg m −2 h −1 , and an ethanol permeability of 184.3 × 10 −6 mol m −1 h −1 kPa −1 , when separating ethanol from 5 wt % ethanol/water solution at 40 °C. Based on the experimental findings, lower feed concentration and operating temperature were suggested in the applications of the silicalite-1/PDMDES nanocomposite membranes for efficient alcohol recovery from aqueous solution.■ HIGHLIGHTS 1. Innovative preparation of silicalite-1/PDMDES nanocomposite membranes for efficient alcohol recovery from aqueous solutions. 2. Preheating strategy utilized to enhance compatibility between silicalite-1 and PDMDES in membrane preparation. 3. Breakthrough in trade-off balances: the silicalite-1/ PDMDES nanocomposite membrane surpasses pristine PDMDES membrane in separation performance, with 90% enhancement in separation factor and more than 9.6% enhancement in total flux. 4. Low-viscosity PDMDES limits the maximum silicalite-1 loading of 10 wt % and results in exceeding designed silicalite-1 loading in membranes. 5. Exceptional separation performance: the silicalite-1/ PDMDES nanocomposite membrane achieves a high flux of 5.72 kg m −2 h −1 and a PSI of 31.36 kg m −2 h −1 in ethanol recovery.

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Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

Cited by 24 publications

References 98 publications

Research Progress on Extraction, Separation, and Purification Methods of Plant Essential Oils

Research Progress on Extraction, Separation, and Purification Methods of Plant Essential Oils

A Review of Recent Developments of Pervaporation Membranes for Ethylene Glycol Purification

Enhancing Pervaporation Performance for Alcohol Recovery from Aqueous Solutions with Silicalite-1/Polydimethyldiethoxysilane (PDMDES) Nanocomposite Membranes

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