Analysis of the transport properties of thermally rearranged (TR) polymers and polymers of intrinsic microporosity (PIM) relative to upper bound performance

Robeson, Lloyd M.; Dose, Michelle E.; Freeman, Benny D.; Paul, Donald R

doi:10.1016/j.memsci.2016.11.085

Cited by 85 publications

(45 citation statements)

References 67 publications

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“…For CO 2 /CH 4 , several TR polymers significantly exceeded the upper bound. The bases for their unusually high permeability/selectivity combinations are (i) high gas solubility, an inherent characteristic of high freevolume glassy polymers such as PIMs and TR polymers; (ii) high gas diffusion coefficients, which are also a consequence of high free volume; and (iii) for several gas pairs (e.g., O 2 /N 2 and CO 2 /CH 4 ), unusually high gas diffusion selectivity, suggesting size and size distribution of free-volume elements in a range particularly suitable for separating these gas molecules based on sub-Angstrom differences in effective gas molecule size (28).…”

Section: Origin Of the Permeability-selectivity Trade-offmentioning

confidence: 99%

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Park

Kamcev

Robeson

et al. 2017

Science

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Increasing demands for energy-efficient separations in applications ranging from water purification to petroleum refining, chemicals production, and carbon capture have stimulated a vigorous search for novel, high-performance separation membranes. Synthetic membranes suffer a ubiquitous, pernicious trade-off: highly permeable membranes lack selectivity and vice versa. However, materials with both high permeability and high selectivity are beginning to emerge. For example, design features from biological membranes have been applied to break the permeability-selectivity trade-off. We review the basis for the permeability-selectivity trade-off, state-of-the-art approaches to membrane materials design to overcome the trade-off, and factors other than permeability and selectivity that govern membrane performance and, in turn, influence membrane design.

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Section: Origin Of the Permeability-selectivity Trade-offmentioning

confidence: 99%

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Park

Kamcev

Robeson

et al. 2017

Science

Self Cite

2,341

1,530

View full text Add to dashboard Cite

show abstract

“…Many different polymers are investigated as materials for gas separation [5]: polysulfone (PSf) [6,7], polyimides (PIs) [5,8,9], polyamides (PAs) [5,10], polyalkynes [5,11], perfluorinated polymers [5,12,13], polyphenylene oxide (PPO) [5,14], poly(dimethylsiloxane) (PDMS) [5,10], mixed-matrix membranes [15,16], thermally rearranged polymers (TR) [12,17], and polymers of intrinsic microporosity (PIMs) [12,16]. The performances of these polymers are discussed in detail in the literature [5,18].…”

Section: Introductionmentioning

confidence: 99%

Biomethane Production from Biogas by Separation Using Thin‐Film Composite Membranes

et al. 2017

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Raw biogas obtained from a sewage plant was successfully purified by a single‐step method to a quality compatible with compressed natural gas (CNG) standards. For this purpose, thin‐film composite membranes with polyamide skin layer were evaluated at varying temperatures, pressures, feed and sweep flow rates. The wetting of the polyamide skin layer was analyzed under different experimental conditions. Optimization of the purification process resulted in a better separation than that in previous studies. The achieved CH4 and H2S levels are conform to the required standards for commercialization in the Czech Republic. A unique feature of the presented approach, distinguishing the water‐swollen thin‐film composite membranes from polymeric membranes under dry conditions, is that the condensing water absorbs a significant amount of the minor impurities of biogas, such as H2S.

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“…For this analysis, diffusion diameters resulted in the lowest sum‐of‐squared residuals when comparing between predicted and non‐perfluoropolymer λ A/B values for all gas pairs considered in this analysis. Other diameter sets considered included the kinetic, Dal‐Cin, Teplyakov‐Meares, Lennard‐Jones, permeability correlation, Lennard‐Jones collision, and effective diameters …”

Section: Analysis Proceduresmentioning

confidence: 99%

The perfluoropolymer upper bound

Drayton

Smith

2019

AIChE Journal

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Perfluoropolymers have fundamentally distinct thermodynamic partitioning properties compared to those of their hydrocarbon counterparts. However, current upper bound theory assumes hydrocarbon solubility behavior for all polymers. Herein, the fundamental presupposition of invariance in solubility behavior to upper bound performance is critically assessed for perfluoropolymers and hydrocarbon polymers. By modifying solubility relationships, theoretical perfluoropolymer upper bounds are established, showing a positive shift of the upper bound front as a result of beneficial solubility selectivities for certain gas pairs, including N2/CH4, He/H2, He/N2, He/CH4, and He/CO2. Within the framework of the solution–diffusion model, an analysis is presented to compare two independent approaches often pursued in efforts to surpass the polymer upper bound: (a) achieving solubility selectivity via perfluoropolymers and (b) improving diffusion selectivity via rigid hydrocarbon polymers. This analysis demonstrates the significant benefit that can be achieved by considering both the chemical composition and morphology of solid‐state macromolecules when designing membrane materials.

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Analysis of the transport properties of thermally rearranged (TR) polymers and polymers of intrinsic microporosity (PIM) relative to upper bound performance

Cited by 85 publications

References 67 publications

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Biomethane Production from Biogas by Separation Using Thin‐Film Composite Membranes

The perfluoropolymer upper bound

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