Advanced membranes containing star macromolecules with C60 core for intensification of propyl acetate production

Pulyalina, Alexandra; Porotnikov, Dmitry; Rudakova, Daria; Faykov, Ilya; Числова, И. В.; Rostovtseva, Valeriia; Виноградова, Л. В.; Тойкка, А. М.; Polotskaya, G. A.

doi:10.1016/j.cherd.2018.05.034

Cited by 11 publications

(8 citation statements)

References 49 publications

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“…HSM are the twelve-arm stars with six polystyrene arms and six arms of a diblock copolymer poly-2-vinylpyridine- block -poly- tert -butylmethacrylate covalently attached to the common fullerene (C 60 ) core and IL is 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][Tf 2 N]). In the previous works, we have presented a comprehensive study of the hybrid membranes containing star macromolecules with a fullerene (C 60 ) branching center and 12 arms of different nature, which showed increased separation properties in the pervaporation of aqueous organic and organic mixtures [ 38 , 39 , 40 , 41 ]. Poly(2, 6-dimethyl-1, 4-phenylene oxide) (PPO) has been used as a polymer matrix and proved itself as a membrane material with good operational properties [ 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Pervaporation Membrane Selectivity by Incorporating Star Macromolecules Modified with Ionic Liquid for Intensification of Lactic Acid Dehydration

et al. 2021

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Modification of polymer matrix by hybrid fillers is a promising way to produce membranes with excellent separation efficiency due to variations in membrane structure. High-performance membranes for the pervaporation dehydration were produced by modifying poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) to facilitate lactic acid purification. Ionic liquid (IL), heteroarm star macromolecules (HSM), and their combination (IL:HSM) were employed as additives to the polymer matrix. The composition and structure of hybrid membranes were characterized by X-ray diffraction and FTIR spectroscopy. Scanning electron microscopy was used to investigate the membranes surface and cross-section morphology. It was established that the inclusion of modifiers in the polymer matrix leads to the change of membrane structure. The influence of IL:HSM was also studied via sorption experiments and pervaporation of water‒lactic acid mixtures. Lactic acid is an essential compound in many industries, including food, pharmaceutical, chemical, while the recovering and purifying account for approximately 50% of its production cost. It was found that the membranes selectively remove water from the feed. Quantum mechanical calculations determine the favorable interactions between various membrane components and the liquid mixture. With IL:HSM addition, the separation factor and performance in lactic acid dehydration were improved compared with pure polymer membrane. The best performance was found for (HSM: IL)-PPO/UPM composite membrane, where the permeate flux and the separation factor of about 0.06 kg m−2 h−1 and 749, respectively, were obtained. The research results demonstrated that ionic liquids in combination with star macromolecules for membrane modification could be a promising approach for membrane design.

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Section: Introductionmentioning

confidence: 99%

Enhancing Pervaporation Membrane Selectivity by Incorporating Star Macromolecules Modified with Ionic Liquid for Intensification of Lactic Acid Dehydration

et al. 2021

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“…Hybrid PPO membranes modified with star macromolecules composed of a C 60 core and six polystyrene (PS) arms and six poly-2-vinylpyridine (P2VP) arms have provided enhanced selectivity in dehydration of acetic acid [26] and separation of the quaternary mixture (n-propanol/acetic acid/propyl acetate/water) [27]. It has been reported [27][28][29][30][31] that PPO membranes modified with star macromolecules exhibited enhanced pervaporation performance, presumably due to the presence of polymer arms with a different chemical nature (nonpolar and polar) in a modifier. The PS arms are fully compatible with the PPO matrix and a phase separation does not occur up to the temperatures of their thermal destruction [32].…”

Section: Introductionmentioning

confidence: 99%

“…The PS arms are fully compatible with the PPO matrix and a phase separation does not occur up to the temperatures of their thermal destruction [32]. Star modifiers significantly affect the internal structure and the free volume of the membranes [27].…”

Section: Introductionmentioning

confidence: 99%

Strongly Selective Polymer Membranes Modified with Heteroarm Stars for the Ethylene Glycol Dehydration by Pervaporation

et al. 2020

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Hybrid membranes based on poly (2,6-dimethyl-1,4-phenylene oxide) modified with heteroarm stars (HAS) were developed to separate ethylene glycol/water mixtures by pervaporation. The HAS consist of a small branching center fullerene C 60 and twelve arms of different nature, six arms of nonpolar polystyrene and six arms of polar poly-tert-butyl methacrylate. The changes of structure and physical properties with HAS inclusion were systematically studied using SEM, X-ray diffraction analysis, TGA, and contact angle measurements. Mass transfer of ethylene glycol and water through membranes was studied by sorption and pervaporation tests. It was found that the growth of HAS content up to 5 wt% in the membrane leads to an increase in the total flux and a strong increase in the separation factor. To evaluate intrinsic properties of the penetrant–membrane system, permeability and selectivity were calculated. Overall, utilizing star-shaped macromolecules as a filler can be a promising way to improve the separation performance of diffusion membranes.

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“…Heteroarm HSMs were prepared by multistage synthesis via attaching chains of different nature to a fullerene C 60 central core by anionic polymerization methods [30,32]. The macromolecule comprised six PS arms and six P2VP-block-PtBMA diblock copolymer arms grafted onto a common fullerene C 60 central core (total functionality of 12).…”

Section: Methodsmentioning

confidence: 99%

“…Membranes made of PPO modified with star-shaped macromolecules with a fullerene C 60 central core were effective in the separation of a methanol-ethylene glycol binary alcohol mixture [27][28][29]. The addition of a modifier to the polymer matrix leads to a significant change in the structure of film membranes [30,31], which has a positive effect on the selectivity and efficiency of purification of ethylene glycol from methanol impurities.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation Desulfurization of a Thiophene/n-Octane Mixture Using PPO Membranes Modified with Hybrid Star-Shaped Macromolecules

Pulyalina

Tataurov

Larkina

et al. 2019

Membr. Membr. Technol.

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The presence of sulfur-containing impurities in petroleum naphtha causes a decrease in the cost and quality of fuels, a reduction in the service life of car engines, and an increase in the amount of harmful emissions into the atmosphere. Pervaporation is an alternative cost-effective fuel desulfurization method. In this study, hybrid membranes based on poly(2,6-dimethyl-1,4-phenylene oxide) and a star-shaped modifier for the pervaporation separation of a thiophene/n-octane model mixture is developed. Hybrid star-shaped macromolecules comprising six polystyrene arms and six poly(2-vinylpyridine)-block-poly(tert-butyl methacrylate) diblock copolymer arms grafted onto a common fullerene C 60 central core are used as the modifier. Membrane structure is analyzed by scanning electron microscopy and atomic force microscopy. Thermal properties are studied by differential scanning calorimetry. The separation properties of the membranes are determined at low thiophene concentrations (up to 0.08 wt %). It is shown that the introduction of a starshaped modifier leads to an increase in the extraction efficiency of sulfur-containing impurities from octane, which is the main fuel component.

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Advanced membranes containing star macromolecules with C60 core for intensification of propyl acetate production

Cited by 11 publications

References 49 publications

Enhancing Pervaporation Membrane Selectivity by Incorporating Star Macromolecules Modified with Ionic Liquid for Intensification of Lactic Acid Dehydration

Enhancing Pervaporation Membrane Selectivity by Incorporating Star Macromolecules Modified with Ionic Liquid for Intensification of Lactic Acid Dehydration

Strongly Selective Polymer Membranes Modified with Heteroarm Stars for the Ethylene Glycol Dehydration by Pervaporation

Pervaporation Desulfurization of a Thiophene/n-Octane Mixture Using PPO Membranes Modified with Hybrid Star-Shaped Macromolecules

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