The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 1989
Filed:
Dec. 01, 1987
Joseph J Hammel, Pittsburgh, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
A hollow, porous, silica-rich fiber and a process for separating at least one gas from a gaseous mixture utilizing the hollow, porous, silica-rich fiber result in gas separations with good permeability and good selectivity. The hollow, porous, silica-rich fiber is non-crystalline and has pore sizes having a range of 1 to around 50 Angstroms in diameter and a mean pore size of around 5 to 50 Angstroms in diameter and a filament diameter in the range of 1 to around 250 microns and wall thickness in the range of around 1 to 50 microns. The hollow, porous, silica-rich fibers with a fine pore structure and thin walls are produced by forming hollow glass fibers by attenuation from melt at speeds in the range of 500 ft/min to around 30,000 ft/min and having a non-phase-separated glass composition selected from: a non-phase separable fiberizable glass composition, a phase separable borosilicate having one or more oxides of a metal from Group IVB of the Periodic Table, a phase-separable glass composition with an amount of boron oxide of around 5 weight percent up to around 60 weight percent, and alkali metal oxide silicate glass compositions. The non-heat treated glass fibers are leached to extract acid and/or water soluble components. At least one hollow, porous, silica-rich fiber is used in a device suitable to contain a gaseous mixture and the permeate is withdrawn from the glass fiber from the opposite side from that at which the gaseous mixture contacts the hollow, porous fiber.