Separation articles and methods for using the same for selectively removing difluoromethane from a gasesous mixture

Abstract

Described herein are separation articles such as, for example, films, membranes and the like separating at least one component from a gaseous mixture comprising two or more components comprising difluoromethane (HFC-32, CH2F2) and pentafluoroethane (HFC-125, C2F5H). The disclosed articles include a “selective layer” that is selectively permeable for the desired component to be separated from the gas mixture. The selective layer is composed of an amorphous fluorinated copolymer. Optionally, the article may include other layers which serve various purposes such as, for example, a porous support layer, a “gutter layer,” which allows the permeate gas to pass from the selective layer to the porous layer with minimal flow impedance, and a protective layer, which protects the selective layer from fouling. Each component of the separation articles described herein and methods for making and using the same are provided below.

Dependencies are inferred from the claim text.