Praxair Technology, Inc.

Kenneth Kai Wong

Dante Patrick Bonaquist

Bayram Arman

John Frederic Billingham

Raymond Francis Drnevich

Henry Edward Howard

Minish Mahendra Shah

Arun Acharya

Richard A Novak

Todd Alan Skare

Mohammad Abdul-Aziz Rashad

Tu Cam Nguyen

Neil Mark Prosser

Michael James Lockett

John Henri Royal

Gary Dee Lang

John Fredric Billingham

Richard A Victor

James B Wulf

Norman Henry White

Vijayaraghavan Srinivasan

Michael John Sinicropi

John Keller Howell

Boris Yudin

Michael Douglas Monteith

William Martin Greene, Iii

John Henry Royal

This invention is directed to a method for purifying argon from an impure argon stream. If the oxygen concentration in the impure argon is less than about 10 mole percent of oxygen, the invention is proceeded in the sequential steps of a) removing chlorine from the impure argon stream; b) adding hydrogen to the impure argon stream; c) removing carbon dioxide and water from the impure argon stream; d) removing hydrogen from the impure argon stream; and e) removing nitrogen from the impure argon stream to form a purified argon stream. If the oxygen concentration in the impure argon is greater than about 10 mole percent of oxygen, the method comprises the sequential steps of a) removing chlorine from the impure argon stream; b) removing carbon dioxide and water from the impure argon stream; c) removing nitrogen and oxygen from the impure argon stream; d) adding hydrogen to the impure argon stream; e) removing water from the impure argon stream; f) removing hydrogen from the impure argon stream; and g) removing nitrogen from the impure argon stream to form a purified stream.

Method of purifying and recycling argon

A refrigeration system wherein an ammonia refrigerant fluid in a cascade refrigeration circuit provides auxiliary refrigeration to a multicomponent refrigerant fluid which passes from an autorefrigerator to provide refrigeration to a heat load.

Multicomponent refrigeration fluid refrigeration system with auxiliary ammonia cascade circuit

A system for producing carbon dioxide wherein carbon dioxide feed fluid is first processed in a cooling section of an integrated heat exchanger before purification in a column, and wherein column bottom fluid operates within one of an evaporating section and desuperheating section of the heat exchanger and refrigerant fluid operates within the other of the evaporating section and desuperheating section of the heat exchanger.

Integrated heat exchanger system for producing carbon dioxide

A method for generating refrigeration using a turboexpander or reverse Brayton cycle which can more efficiently generate refrigeration especially to cryogenic temperatures using a defined refrigerant mixture containing argon and/or nitrogen.

Method for providing refrigeration using a turboexpander cycle

A cryogenic refrigeration system wherein refrigeration is provided to a heat load by a warming multicomponent refrigerant fluid recirculating in a refrigeration circuit and by cryogenic liquid separately provided to the heat load in direct or indirect heat exchange with the heat load.

Cryogenic refrigeration system

A system wherein flashoff losses from cryogenic liquid tankage are reduced wherein fluid from the tankage is condensed and subcooled against refrigeration bearing refrigerant fluid generated by an exogenous refrigeration system.

System for operating cryogenic liquid tankage

A method for providing refrigeration, such as to an insulated enclosure for food freezing, wherein a defined hydrocarbon-containing multicomponent refrigerant fluid undergoes a phase change coupled with Joule-Thomson expansion to generate refrigeration over a wide temperature range which may comprise from ambient to low temperatures.

Food freezing method using a multicomponent refrigerant

A refrigeration system wherein refrigeration is generated at a relatively steady output by a refrigeration circuit and passed into a coupling fluid for transfer to a refrigeration load using a coupling fluid stabilizing circuit having a stabilizing reservoir.

Refrigeration system with coupling fluid stabilizing circuit

A cryogenic air separation comprising an integrated core and typically including a double column wherein incoming feed air is cooled in the core which also processes a stream from the double column. A separating section of the core processes a stream from the double column to product.

Cryogenic air separation system with integrated mass and heat transfer

A cryogenic air separation system wherein an integrated core receives and cools an incoming feed air stream, a rectification section facilitates mass transfer of the feed air stream, a separation section in a heat exchange relationship with the rectification section processes fluid from the rectification section, and a section in a heat exchange relationship with an entrance passage discharges fluid from the integrated core.

Cryogenic air separation system using an integrated core

A cryogenic air separation system employing a double column wherein lower pressure column bottom liquid is pressurized in a single cryogenic liquid pump to provide driving fluid for the main condenser and to provide product elevated pressure oxygen.

Cryogenic air separation system for producing elevated pressure oxygen

An annular column, particularly useful for cryogenic rectification, comprising coaxially oriented, radially spaced cylindrical column walls defining a first column region, and a second column region between the walls, wherein different fluid mixtures are rectified in each of the first column and second column regions.

Annular column for cryogenic rectification

A cryogenic rectification system wherein a product boiler is incorporated into the primary heat exchanger without encountering boiling to dryness problems wherein liquid from the cryogenic rectification plant is processed in a phase separator upstream of the product boiler, and fluid from the product boiler is passed into the phase separator prior to recovery.

Cryogenic rectification system with integral product boiler

A cryogenic rectification system for producing oxygen having a feed air preparation system and a plurality of same size cold box modules operating in parallel and in conjunction with the feed air preparation system.

Growing community of inventors

Amherst, NY, United States of America

Kenneth Kai Wong