Abstract: The present application offers a solution to the current problems associated with recovery and recycling of precious metals from scrap material, discard articles, and other items comprising one or more precious metals. The solution is premised on a microporous chelating polymeric membrane. Embodiments include, but are not limited to, microporous chelating polymeric membranes, device comprising the membranes, and methods of using and making the same.

Abstract: In a method of producing a polymer for making proton conductive membranes on the basis of a base polymer other than a vinyl polymer said base polymer is a) bromated or iodized, b) the bromated or iodized polymer is reacted with at least one of phosphonic acid esters and phosphoric acid esters in the presence of a transition metal catalyst whereby a reaction polymer is formed, c) the reaction polymer of step b is hydrolyzed, and d) from the hydrolyzed polymer of step c) a polymer film is produced.

Abstract: A proton-conductive membrane for electrochemical applications, particularly for use in fuel cells, is provided. The membrane consists of a polymer based on a base polymer, other than a vinyl polymer, which includes aromatic rings and also sulfonic acid groups which are bound covalently directly to the aromatic rings of the base polymer, that is, without spacer groups therebetween.

Abstract: In a method for the separation of supercritical gas from substances dissolved in the gas with a membrane through which the gas passes while the substances dissolved in the gas is retained, a pore-free membrane of a polymer perfluoro-2,2-diemthyl-1,3-dioxole is used as a membrane in the separation process.

Abstract: A proton-conductive membrane for electrochemical applications, particularly for use in fuel cells, is provided. The membrane consists of a polymer based on a base polymer, other than a vinyl polymer, which includes aromatic rings and also sulfonic acid groups which are bound covalently directly to the aromatic rings of the base polymer, that is, without spacer groups therebetween.

Abstract: In an apparatus for separating at least one component from a fluid mixture, comprising a plurality of hollow fiber membrane frames through which a carrier fluid is conducted while the fluid mixture flows through the frames in a direction normal to the hollow fiber membranes supported in the frame, a plurality of frames are stacked on top of one another and shaped so that, together, they form a sealed tubular structure for guiding the fluid mixture past the hollow fiber membranes extending across the frames.

Abstract: In a method for the separation of supercritical gas from substances dissolved in the gas with a membrane through which the gas passes while the substances dissolved in the gas is retained, a pore-free membrane of a polymer perfluoro-2,2-diemthyl-1,3-dioxol is used as a membrane in the separation process.

Abstract: A method of removing organic compounds from an air/permanent gas mixture. This mixture, as untreated medium, is conveyed to a first gas separation membrane and is divided into a filtrate gas stream that is concentrated with organic compounds and a retained gas stream that is depleted of organic compounds. The concentrated filtrate is conveyed to a recovery device for the recovery of organic compounds therefrom. The pressure of the air/permanent gas mixture is raised prior to entry thereof into the first gas separation membrane. The pressure of the concentrated filtrate is reduced after exit thereof from the first gas separation membrane. The depleted gas stream is discharged into the atmosphere, and the gas stream that exits the recovery device is returned to the air/permanent gas mixture at some point subsequent to the pressure increase thereof.