Union Carbide Corporation

Praxair Technology, Inc.

Union Carbide Industrial Gases Technology Corporation

Prazair Technology, Inc.

Harry Cheung

Dante Patrick Bonaquist

Arun Acharya

James R Dray

Mark J Roberts

Ravi Prasad

Michael James Lockett

John Henri Royal

Ravindra F Pahade

Richard A Victor

John H Ziemer

Michael F Patterson

Oscar W Haas

Robert A Beddome

Michael Robert Couche

Paul Louis Just

James Brian Mize

David I Wang

Charles Richard Baker

A method for generating refrigeration for application to a heat load, especially at very cold temperatures, using an environmentally benign working gas such as air and using an upstream precooling circuit to reduce or eliminate inefficiencies stemming from warm end pinch.

Method for generating a cold gas

A cryogenic rectification system employing a double column and an auxiliary side column in which product lower purity oxygen is produced wherein the side column is driven by condensing compressed feed air enabling the system to operate with lower head pressure and thus lower operating costs.

Side column cryogenic rectification system for producing lower purity

A cryogenic rectification system wherein nonproduct fluid from a cryogenic rectification plant is compressed and mixed with incoming feed at an intermediate temperature, and the resulting mixture passed into the cryogenic rectification plant enabling production of product with improved recovery especially at elevated pressure.

Cryogenic rectification system with improved recovery

A single column lower pressure cryogenic rectification system wherein nitrogen top vapor is condensed against column bottoms, elevated in pressure, and vaporized against elevated pressure fluid to achieve simultaneously high purity and high pressure nitrogen gas product.

Single column cryogenic rectification system for producing nitrogen gas

A cryogenic air separation system using a random packing section below a section of structured packing and redistributing liquid between sets of random and structured Packing sections.

Cryogenic air separation using random packing

A cryogenic rectification system wherein bottoms from a single column nitrogen production system are used to produce ultra high purity oxygen in a two column purification system, and bottoms from the first purification column are employed to drive the nitrogen column top condenser to generate additional nitrogen column reflux.

Cryogenic rectification system for producing nitrogen and ultra high

A cryogenic rectification system comprising two cryogenic rectification plants wherein a fluid mixture comprising argon and nitrogen is withdrawn in a defined manner from the first plant and passed into the second plant such that argon production is enhanced to more than offset the additional separation power requirements.

Cryogenic rectification system for enhanced argon production

A method and apparatus for producing elevated pressure nitrogen with improved recovery comprising a primary column and a lower pressure auxiliary column wherein auxiliary column top vapor is condensed, pressurized and passed into the primary column.

Method and apparatus for producing elevated pressure nitrogen

A cryogenic air separation method for the production of oxygen and medium pressure nitrogen comprising a primary higher pressure column and an auxiliary smaller lower pressure stripping column wherein primary column bottom liquid is employed as stripping column downflow liquid and primary column top vapor condenses against stripping column bottom liquid to generate stripping vapor.

Cryogenic air separation method for the production of oxygen and medium

Method and apparatus for improving xenon recovery wherein a liquid containing krypton and xenon is removed from a cryogenic rectification facility at a defined flowrate which selectively improves xenon recovery and is provided into a facility having rare gas production capability.

Xenon production system

Feed air to a prepurifier adsorption system/cryogenic air separation system for dry, high purity nitrogen and/or oxygen production is dried in a membrane dryer preferably characterized by a countercurrent flow path. Drying is enhanced by the use of purge gas on the permeate side of the membrane dryer, which adsorption system or cryogenic air separation system product or waste gas, dried feed air or ambient air being used as purge gas.

Dry, high purity nitrogen production process and system

A process for producing ultra high purity nitrogen from nitrogen produced by the cryogenic rectification of air wherein superatomospheric nitrogen is progressively condensed and revaporized to effect rejection of lower boiling impurities without need for additional energy beyond that contained in the nitrogen input.

Cryogenic rectification process for producing ultra high purity nitrogen

Process and apparatus to produce argon at high recovery with nitrogen at higher than conventional pressure comprising three columns wherein first column bottoms are passed into the second column, second column bottoms drive a third column top condenser, and argon-containing fluid is passed for separation into the third column from the second column at a point intermediate the points where first column bottoms enter and second column bottoms exit the second column.

Air separation process and apparatus for high argon recovery and

A process and apparatus to produce ultra high purity oxygen comprising serially oriented stripping and absorbing columns having defined flow stream relationships.

Growing community of inventors

Buffalo, NY, United States of America

Harry Cheung