L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

American Air Liquide, Inc.

Madhava R Kosuri

Dean W Kratzer

Canghai Ma

Sudhir S Kulkarni

David J Hasse

Robert A Gagliano

Raja Swaidan

Henri Chevrel

Gregoire Beasse

Claire Bourhy-Weber

Mathieu Leclerc

Tao Li

Sarang Gadre

Matthieu Leclerc

Fan Worley

Metallopolyimide precursor fibers for aging-resistant carbon molecular sieve hollow fiber membranes having enhanced selectivity include transition metal cations complexed with electronegative regions of a polyimide. CMS membranes are made by pyrolyzing the metallopolyimide precursor fibers. The cations are introduced by including, in the spin dope composition used to extrude the fibers, either a salt of the transition metal and an inorganic anion or a transition metal/organic ligand complex.

Metallopolyimide precursor fibers for aging-resistant carbon molecular sieve hollow fiber membranes with enhanced selectivity

Metallopolyimide precursor fibers for aging-resistant carbon molecular sieve hollow fiber membranes having enhanced selectivity include transition metal cations complexed with electronegative regions of a polyimide. CMS membranes are made by pyrolyzing the metallopolyimide precursor fibers. The cations are introduced by including, in the bore fluid used to extrude the fibers, either a salt of the transition metal and an inorganic anion or a transition metal/organic ligand complex.

A carbon molecular sieve (CMS) membrane is made by pyrolyzing, to a peak pyrolysis temperature T, a hollow fiber membrane having a polymeric sheath surrounding a polymeric core, anti-substructure collapse particles present in pores formed in the polymeric core help prevent collapse of pores formed in the hollow fiber membrane before pyrolysis. The anti-substructure collapse particles are made of a material or materials that either: i) have a glass transition temperature Thigher than T, ii) have a melting point higher than T, or ii) are completely thermally decomposed during said pyrolysis step at a temperature less than T. The anti-substructure collapse particles are not soluble in a solvent used for dissolution of the polymeric material of the core.

Composite carbon molecular sieve membranes having anti-substructure collapse particles loaded in a core thereof

A process for separating carbon dioxide from a fluid containing carbon dioxide, NO, and at least one of oxygen, argon, and nitrogen comprises the steps of separating at least part of the fluid into a carbon dioxide enriched stream, a carbon dioxide depleted stream comprising COand at least one of oxygen, argon, and nitrogen and a NOenriched stream and recycling said NOenriched stream upstream of the separation step.

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A composite fluid separation membrane includes a separation layer on a porous support layer where the separation layer comprises a cross-linked polysiloxane copolyether.

Membrane for the separation of a mixture of a polar fluid and a non-polar fluid and methods for use thereof

A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic compound and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic compound. The fiber is made by extruding first and second suspensions of the first and second ceramic compounds in polymeric binders and solvent from a spinnerette and coagulating the nascent hollow fiber to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binder is burned off. Second, the sheath is densified and the second ceramic compound is sinter without fully sintering the first ceramic compound. The first ceramic compound has a melting point higher than that of the second ceramic compound.

Composite hollow ceramic fibers, precursors for, methods of making the same, and methods of using the same

A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic material and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic material. The fiber is made by extruding core and sheath suspensions from a spinnerette. The core suspension includes particles of the first ceramic material, a polymeric binder, a solvent, and a pore former material insoluble in the solvent. The sheath suspension includes particles of the second ceramic material, a polymeric binder and a solvent. The nascent hollow fiber is coagulated in a coagulant bath to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binders and pore former material are burned off. Second, the sheath is densified and the second ceramic material is sintered without fully sintering the core.

Hollow ceramic fibers, precursors for manufacture thereof utilizing pore formers, methods of making the same, and methods of using the same

Purified SiHCland/or SiClare used as a sweep gas across a permeate side of a gas separation membrane receiving effluent gas from a polysilicon reactor. The combined sweep gas and permeate is recycled to the reactor.

Growing community of inventors

Newark, DE, United States of America

Madhava R Kosuri