Fabrication of Hollow Fiber Membrane from Polyarylate–Polyarylate Block Copolymer for Air Separation

Ivanov, Mikhail; Storozhuk, I. P.; Dibrov, George; Semyashkin, Mikhail; Pavlukovich, N. G.; Kagramanov, G. G.

doi:10.1134/s0965544118040047

Cited by 6 publications

(10 citation statements)

References 13 publications

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“…The concentration of THF as a moderate solvent was chosen as 15 % wt. because of the positive results described in previous studies [17,22]. THF has high volatility and improves selective layer formation.…”

Section: Asymmetric Hollow Fiber Spinning and Characterizationmentioning

confidence: 69%

“…For the dope temperature 62 • C (sample #1), an increase in the take-up speed from 30 to 45 m/min (sample #2) or reduction in the air gap height (sample #3) resulted in the rise of permeance and a decline of the selectivity. This was connected with the decrease of the selective layer thickness and occurred due to the decline of the time spent in the air gap, where volatile THF readily evaporates [22]. Permeance and selectivity values show that the transport mechanism is transitional between the Knudsen and solution-diffusion models.…”

Section: Hollow Fiber Spinning and Characterizationmentioning

confidence: 95%

“…The schematic of the setup is described in detail in [2,[22][23][24]. The dope was placed in a sealed tank, equipped with a water jacket, and either cooled down to 25 • C or warmed up till 62 • C. Spinneret with the dope orifice outer diameter (OD) of 0.5 mm and the inner diameter (ID) of 0.23 mm was used ( Figure 1).…”

Section: Asymmetric Hollow Fiber Spinning and Characterizationmentioning

confidence: 99%

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Elaboration of High Permeable Macrovoid Free Polysulfone Hollow Fiber Membranes for Air Separation

Dibrov

Ivanov

Semyashkin

et al. 2019

Fibers

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In this work, polysulfone hollow fibers with oxygen permeance 70 L (STP)/(m2·h·bar) and selectivity α(O2/N2) = 6 were obtained. A decrease in the dope solution temperature allowed to diminish macrovoids due to the increase of the dope viscosity from 15.5 Pa·s at 62 °C to 35 Pa·s at 25 °C. To reduce the fiber diameter, thereby increasing the packing density, they were spun at high linear velocities. A hollow fiber membrane element was produced with effective membrane area 2.75 m2 and packing density 53%. Its air separation performance was evaluated to bridge laboratory studies and practical application.

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Section: Asymmetric Hollow Fiber Spinning and Characterizationmentioning

confidence: 69%

Section: Hollow Fiber Spinning and Characterizationmentioning

confidence: 95%

Section: Asymmetric Hollow Fiber Spinning and Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Elaboration of High Permeable Macrovoid Free Polysulfone Hollow Fiber Membranes for Air Separation

Dibrov

Ivanov

Semyashkin

et al. 2019

Fibers

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“…Asymmetric hollow-fiber membranes were made using the "dry-wet" spinning technique. The dope (polymeric solution) contained the polymer; NMP was chosen as a good solvent; TFH was chosen as a moderate solvent with high volatility, to enhance the skin-layer formation; and ethanol was chosen as a non-solvent due to its good pore-forming properties [22]. For asymmetric hollow fibers to possess good mechanical properties, the polymer content was chosen to be 30% wt.…”

Section: Asymmetric Hollow-fiber Spinning and Characterizationmentioning

confidence: 99%

“…The schematic of the set-up for asymmetric hollow-fiber spinning is presented in Figure 1 and it was described in detail in References [22][23][24]. The dope solution tank was equipped with a thermal jacket and a gear pump.…”

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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Synthesis of aromatic polyesters derived from bisphenol‐A and bis(hydroxyphenyl)butane with diacyl chloride monomers

Wang

Ding

et al. 2022

J of Applied Polymer Sci

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A series of aromatic polyesters were prepared by the reaction of bisphenol‐A and bis(hydroxyphenyl)butane with diacyl chloride monomers by phase transfer interfacial polycondensation in order to improve the processability of the bisphenol A‐based polyarylate. The microstructure, molecular weight, crystallinity, solubility, thermal properties, mechanical properties, and optical properties of the prepared copolyesters were investigated. Inherent viscosities of the copolyesters are in the range of 0.14–0.53 dl g−1, and their average molecular weights are 7362–44,413 g mol−1, respectively. The feed compositions and copolymer compositions were nearly identical. The results show that with the increase in the content of side ethyl units, the copolyester gradually transforms into an amorphous structure, which is also verified by the improvement in dissolution properties. When the copolyester backbone was introduced into the side ethyl units, the thermal decomposition temperature was less affected and varied in the range of about 10°C, while the value of glass transition temperature reduced from 196.5°C to 165.1°C. The mechanical properties of the polymers are similar to those of the industrial commodity U‐100. In addition, the copolyester films have good optical properties, and the transmittance reached the maximum value of 98.41% when the content of bis(hydroxyphenyl)‐butane was 10%.

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Fabrication of Hollow Fiber Membrane from Polyarylate–Polyarylate Block Copolymer for Air Separation

Cited by 6 publications

References 13 publications

Elaboration of High Permeable Macrovoid Free Polysulfone Hollow Fiber Membranes for Air Separation

Elaboration of High Permeable Macrovoid Free Polysulfone Hollow Fiber Membranes for Air Separation

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

Synthesis of aromatic polyesters derived from bisphenol‐A and bis(hydroxyphenyl)butane with diacyl chloride monomers

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