Jack C Chen

US Patent:

6565632, May 20, 2003

Filed:

Dec 17, 2001

Appl. No.:

10/015622

Inventors:

Bart Antonie van Hassel - Getzville NY
Ravi Prasad - East Amherst NY
Jack Chen - Getzville NY
Jonathan Lane - Amherst NY

Assignee:

Praxair Technology, Inc. - Danbury CT

International Classification:

B01D 5322

US Classification:

96 10, 96 11, 95 54, 95 55

Abstract:

An ion-transport membrane assembly including a tubular, ion-transport membrane that is fabricated from one or more ion-transport, ceramic materials capable of ionic transport at an operational temperature of greater than 400Â C. The membrane may be an oxygen transport membrane or a hydrogen transport membrane. A plurality of structural supporting members, fabricated from an open porous material and having an outer cylindrical surface, are inserted within the membrane, without being bonded to the membrane, to inhibit inward collapse of the membrane under application of a pressure applied to an exterior surface of the membrane. The structural supporting members are configured to permit relative movement between the outer surface of the structural supporting member and the interior surface of the tubular membrane during heating to or cooling from the operational temperature thereof.

US Patent:

6514314, Feb 4, 2003

Filed:

Dec 4, 2000

Appl. No.:

09/727472

Inventors:

John Derrick Sirman - Tonawanda NY
Jack C. Chen - Getzville NY

Assignee:

Praxair Technology, Inc. - Danbury CT

International Classification:

B01D 5322

US Classification:

95 54, 96 4, 96 11

Abstract:

A ceramic membrane structure and method for separating oxygen from an oxygen containing feed at temperatures above about 600Â C. The membrane is provided with a dense layer and one or more active porous layers. The dense layer contains at least a mixed conducting material and the active porous layer is formed of a mixture having an ion conducting phase capable of predominantly conducting oxygen ions and a mixed conducting phase capable of conducting both oxygen ions and electrons. The ion conducting phase is present within the mixture in an amount greater than a percolation threshold and the mixed conducting material and phase have a greater electronic conductivity than ionic conductivity.

US Patent:

6524421, Feb 25, 2003

Filed:

Sep 22, 2000

Appl. No.:

09/668249

Inventors:

Jack C. Chen - Getzville NY
Valerie M. Stawisuck - North Tonawanda NY
Ravi Prasad - East Amherst NY

Assignee:

Praxair Technology, Inc. - Danbury CT

International Classification:

B29B 1112

US Classification:

156245, 156242, 156 8911, 156 8928, 425393, 428 344, 264628, 264632, 264635, 264650, 21050025

Abstract:

A cold isopressing method in which two or more layers of material are formed within an isopressing mold. One of the layers consists of a tape-cast film. The layers are isopressed within the isopressing mold, thereby to laminate the layers and to compact the tape-cast film. The isopressing mold can be of cylindrical configuration with the layers being coaxial cylindrical layers. The materials used in forming the layers can contain green ceramic materials and the resultant structure can be fired and sintered as necessary and in accordance with known methods to produce a finished composite, ceramic structure. Further, such green ceramic materials can be of the type that are capable of conducting hydrogen or oxygen ions at high temperature with the object of utilizing the finished composite ceramic structure as a ceramic membrane element.

US Patent:

6638575, Oct 28, 2003

Filed:

Jul 24, 2000

Appl. No.:

09/624074

Inventors:

Jack Chieh-Cheng Chen - Getzville NY
Hancun Chen - Williamsville NY
Ravi Prasad - East Amherst NY
Glenn Whichard - Centerville VA

Assignee:

Praxair Technology, Inc. - Danbury CT

International Classification:

C23C 404

US Classification:

427453, 427446

Abstract:

Oxygen and hydrogen transport membranes fabricated by plasma spray deposition of a micro-crack-free coating on a substrate. Also disclosed is a multi-layer composite comprising a dense or porous substrate coated with a coating provided by supersonic plasma spray deposition. Also disclosed is subsonic plasma spray deposition of single phase or dual phase nanocrystalline particles to form a crack-free oxygen transport membrane on a substrate.

US Patent:

6776941, Aug 17, 2004

Filed:

Jun 6, 2002

Appl. No.:

10/162632

Inventors:

Prasad S. Apte - East Amherst NY
Shawn W. Callahan - Tonawanda NY
James S. Schneider - Akron NY
Jack C. Chen - Getzville NY

Assignee:

Praxair Technology, Inc. - Danbury CT

International Classification:

B29C 4310

US Classification:

264 71, 264544, 264570, 264109, 4254052

Abstract:

A cold isopressing method and mold for compacting a granular ceramic material in which the granular ceramic material is introduced into a cylindrical pressure bearing element of an isopressing mold. The cylindrical pressure bearing element is sufficiently rigid so as to maintain its shape during the introducing of the granular ceramic material. Such element is also sufficiently resilient in a radial direction thereof to deform and bear against the granular ceramic material upon the application of the hydrostatic pressure and to substantially return to its original shape upon the relaxation of the hydrostatic pressure, thereby to allow retraction of the cylindrical pressure bearing element from the granular ceramic material after compaction. In a further aspect, an isopressing method and mold is provided in which the cylindrical pressure bearing element thereof is provided with an enlarged end bore to form an enlarged end section in the finished ceramic tube for sealing purposes.

US Patent:

6852204, Feb 8, 2005

Filed:

Jul 31, 2002

Appl. No.:

10/208099

Inventors:

Weitung Wang - East Amherst NY, US
Hancun Chen - Williamsville NY, US
Jack C. Chen - Getzville NY, US

Assignee:

Praxair Technology, Inc. - Danbury CT

International Classification:

C25B009/00
C25B011/04

US Classification:

204242, 204260, 204292, 204293, 204291

Abstract:

A wall construction for an electrolytic cell to separate oxygen from an oxygen containing gas in which an electrolyte layer of less than 200 microns and a cathode layer of less than 500 microns are supported by an anode that can have a sufficient thickness to also contain the separated oxygen at pressure. The cathode is formed from the same material as the electrolyte and also a noble metal or noble metal alloy and a mixed conductor. The cathode contains a sufficient amount of the noble metal or noble metal allow and the mixed conductor that the total resistance thereof is not greater than about 70 percent of the total resistance of the anode and the cathode. In a preferred embodiment, first and second porous interfacial layers are situated between an anode layer and the electrolyte and the electrolyte and a cathode layer, respectively. The first and second porous interfacial layers increase thermal compatibility between the anode and cathode and the electrolyte, improve the three-phase boundary and allow thinner electrolytes to be employed with fewer manufacturing defects.

US Patent:

7229537, Jun 12, 2007

Filed:

Jun 10, 2004

Appl. No.:

10/864577

Inventors:

Jack C. Chen - Getzville NY, US
Charles J. Besecker - Batavia IL, US
Hancun Chen - Williamsville NY, US
Earil T. Robinson - Mentor OH, US

Assignee:

Praxair Technology, Inc. - Danbury CT
BP Corporation North America, Inc. - Warrenville IL

International Classification:

C25B 13/04

US Classification:

204295, 429 30, 429 33, 502 4, 95 54, 95 45, 96 4, 96 6, 96 10, 96 11, 4283055, 4283073

Abstract:

A composite oxygen ion transport element that has a layered structure formed by a dense layer to transport oxygen ions and electrons and a porous support layer to provide mechanical support. The dense layer can be formed of a mixture of a mixed conductor, an ionic conductor, and a metal. The porous support layer can be fabricated from an oxide dispersion strengthened metal, a metal-reinforced intermetallic alloy, a boron-doped MoSi-based intermetallic alloy or combinations thereof. The support layer can be provided with a network of non-interconnected pores and each of said pores communicates between opposite surfaces of said support layer. Such a support layer can be advantageously employed to reduce diffusion resistance in any type of element, including those using a different material makeup than that outlined above.

US Patent:

7338624, Mar 4, 2008

Filed:

Jul 31, 2002

Appl. No.:

10/208052

Inventors:

Hancun Chen - Williamsville NY, US
Jack C. Chen - Getzville NY, US
Weitung Wang - East Amherst NY, US

Assignee:

Praxair Technology Inc. - Danbury CT

International Classification:

B29C 44/04

US Classification:

264 451, 264 464, 264301, 264308, 264345

Abstract:

A method of producing a green form for use in manufacturing a composite, ceramic ion transport membrane is provided in which first and second ceramic powder mixtures are used to produce first and second layers of the green form. The first and second ceramic powder mixtures have ceramic particles and a pore former. After formation of each of the first and second layers or after formation of the second layer, heat is applied to burn out the binder and form pores. This heating is completed prior to application of a dense layer to prevent production of defects within the dense layer. The dense layer contains an ion transport material. Defects are also prevented by grading particle size from the first layer to the dense layer. This allows the second intermediate layer to fill in larger pores of the first layer and to present a smooth surface to the dense layer. Additionally, the second ceramic powder mixture contains in part material used in forming the dense layer for thermal expansion compatibility purposes.