4.6 Article

Solubility, Diffusivity, and Permeability of HFC-32 and HFC-125 in Amorphous Copolymers of Perfluoro(butenyl vinyl ether) and Perfluoro(2,2-dimethyl-1,3-dioxole)

Related references

Note: Only part of the references are listed.
Article Engineering, Chemical

Gas sorption and diffusion in perfluoro(butenyl vinyl ether) based perfluoropolymeric membranes

Moataz Ali El-Okazy et al.

Summary: This study investigates the sorption properties of a range of pure gases in amorphous glassy perfluoropolymers and calculates the diffusivity and activation energy using transport models. The results show that the CyclAFlor (TM) copolymer has superior performance for gas separation applications.

JOURNAL OF MEMBRANE SCIENCE (2022)

Review Chemistry, Applied

A review of fluorocarbon sorption on porous materials

Andrew D. Yancey et al.

Summary: Fluorocarbons have been widely used in various applications since the early 20th century, but have been heavily regulated since the late 1980s due to environmental concerns. Porous materials are being studied as sorbents to reduce greenhouse gas emissions, including fluorocarbons. Legislation now requires the reduction of hydrofluorocarbon refrigerants to mitigate global warming, making environmental remediation a relevant issue.

MICROPOROUS AND MESOPOROUS MATERIALS (2022)

Article Chemistry, Multidisciplinary

Phase Equilibria and Diffusivities of HFC-32 and HFC-125 in Ionic Liquids for the Separation of R-410A

Kalin R. Baca et al.

Summary: The phase out of HFC refrigerants has led to a global market shift, prompting industry and research institutions to investigate new refrigerant mixtures and separation techniques. This study examines the solubility of HFC-32 and HFC-125 in ionic liquids for the purpose of designing recycling processes and understanding the choice of cation and anion type. The results show variations in solubility and diffusion coefficients, highlighting potential entrainers for the separation of R-410A using extractive distillation.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2022)

Article Engineering, Chemical

Selective separation of HFC-32 from R-410A using poly(dimethylsiloxane) and a copolymer of perfluoro(butenyl vinyl ether) and perfluoro (2,2-dimethyl-1,3-dioxole)

Abby N. Harders et al.

Summary: This study investigates the use of poly(dimethylsiloxane) and CyclAFlor(TM) for the separation of R-410A, indicating high selectivity of HFC-32 over HFC-125. Permeability measurements and stability studies show promising results for the efficient separation of HFC refrigerant mixtures using membranes.

JOURNAL OF MEMBRANE SCIENCE (2022)

Review Environmental Sciences

A review of bottom-up and top-down emission estimates of hydrofluorocarbons (HFCs) in different parts of the world

Hannah Flerlage et al.

Summary: HFCs are alternatives to ozone-depleting substances and are regulated under the Kigali Amendment. Emission estimates can be done through bottom-up or top-down methods, with discrepancies between developed and developing countries' reported emissions. China plays a significant role in the emissions contributing to the gap, but there is a lack of data on emissions from other developing countries.

CHEMOSPHERE (2021)

Article Engineering, Chemical

Effect of feed pressure and long-term separation performance of Pebax-ionic liquid membranes for the recovery of difluoromethane (R32) from refrigerant mixture R410A

Fernando Pardo et al.

Summary: The utilization of ionic liquids and polymeric membranes in combination has successfully led to the separation of R32 refrigerant from R410A, offering significant potential for the refrigeration and air conditioning industry. The composite membranes demonstrate remarkable improvements in R32 permeability and R32/R125 selectivity, with long-term stability under high pressure conditions, making them excellent candidates for membrane-based R32 separation and recovery processes.

JOURNAL OF MEMBRANE SCIENCE (2021)

Article Engineering, Chemical

Absorption separation of fluorinated refrigerant gases with ionic liquids: Equilibrium, mass transport, and process design

Salvador Asensio-Delgado et al.

Summary: This article discusses the importance of recovering and reclaiming refrigerant gases, as well as the research on using ionic liquids for separating fluorinated gas mixtures. It provides a comprehensive compilation of data and process design directions for refrigerant families including chlorofluorocarbons, hydrofluoroolefins, and hydrochlorofluoroolefins.

SEPARATION AND PURIFICATION TECHNOLOGY (2021)

Article Engineering, Chemical

Gas separation performance of copolymers of perfluoro(butenyl vinyl ether) and perfluoro(2,2-dimethyl-1,3-dioxole)

Moataz Ali El-Okazy et al.

Summary: Amorphous glassy perfluorinated polymers possess high gas permeability, chemical inertness, thermal stability, and superior separation performance, particularly when copolymerized with perfluoro(butenyl vinyl ether) (PBVE) and perfluoro(2,2-dimethyl-1,3-dioxole) (PDD) at different ratios. Higher PBVE content results in lower gas permeability and higher selectivity. The copolymers show promising separation performance at high temperatures and exhibit increased H-2/CO2 selectivity with temperature.

JOURNAL OF MEMBRANE SCIENCE (2021)

Article Chemistry, Multidisciplinary

Toward the Recycling of Low-GWP Hydrofluorocarbon/Hydrofluoroolefin Refrigerant Mixtures Using Composite Ionic Liquid-Polymer Membranes

Fernando Pardo et al.

Summary: Ionic liquid-functionalized composite membranes show promising performance and stability for the separation of HFC/HFO mixtures, which may facilitate the recovery and reuse of exhausted refrigerants, reducing emissions and decreasing the demand for virgin refrigerants.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2021)

Article Chemistry, Multidisciplinary

Separation of Refrigerant Gas Mixtures Containing R32, R134a, and R1234yf through Poly(ether-block-amide) Membranes

Fernando Pardo et al.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2020)

Review Thermodynamics

(R)Evolution of Refrigerants

Mark O. McLinden et al.

JOURNAL OF CHEMICAL AND ENGINEERING DATA (2020)

Article Engineering, Environmental

Are Fluoropolymers Really of Low Concern for Human and Environmental Health and Separate from Other PFAS?

Rainer Lohmann et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

Review Materials Science, Coatings & Films

Review Article: Gas and vapor sorption measurements using electronic beam balances

David L. Minnick et al.

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A (2018)

Article Polymer Science

Polymeric Gas Separation Membranes

Yuri Yampolskii

MACROMOLECULES (2012)