Patent ID: 8741031

Claim:
A process for making a composite hollow fiber, comprising the steps of: preparing a core suspension comprising a first polymeric binder, a first particulate ceramic material, a first solvent, and a pore former material; preparing a sheath suspension comprising a second polymeric binder, a second particulate ceramic material, and a second solvent; providing a spinnerette adapted and configured to continuously extrude one or more nascent hollow fibers comprising a hollow core formed from the core suspension and a sheath surrounding the core formed from the sheath suspension; immersing the nascent hollow fiber in a liquid coagulant to facilitate phase inversion of the first and second polymeric binders; and withdrawing the coagulated fiber from the liquid coagulant, wherein: the pore former material is not present in the sheath suspension; the pore former material is insoluble in the first and second solvents; the second particulate ceramic material comprises a mixed oxide conductor; the first and second particulate ceramic materials are chemically identical or different; the first and second solvents are the same or different; and the first and second polymeric binders are the same or different.