Patent ID: 8747525

Claim:
A process for making a composite hollow fiber, comprising the steps of: preparing a first suspension comprising a first polymeric binder, particles of a first ceramic compound, a solvent, and optionally particles of a second ceramic compound; preparing a second suspension comprising a second polymeric binder, particles of the second ceramic compound, the solvent, and optionally particles of the first ceramic compound; providing a spinnerette adapted and configured to continuously extrude one or more nascent hollow fibers comprising a hollow core formed from the first suspension and a sheath surrounding the core formed from the second suspension; immersing the nascent hollow fiber in a liquid coagulant to facilitate phase inversion of the first and second polymeric binders, wherein: the first ceramic compound is a mixed oxide conductor; the second ceramic compound is a mixed oxide conductor; the first ceramic compound is not the same as the second ceramic compound; the first ceramic compound has a melting point higher than that of the second ceramic compound; and the first and second polymeric binders are the same or different.