Union Carbide Corporation

Praxair Technology, Inc.

Union Carbide Industrial Gases Technology Corporation

Ravindra F Pahade

James J Maloney

John H Ziemer

James R Handley

John B Saunders

Raymond Francis Drnevich

Minish Mahendra Shah

Neil Mark Prosser

Harry Cheung

Joseph Alfred Weber

Thomas C Hanson

Theodore F Fisher

Walter J Olszewski

John Keller Howell

Brien Scott Wierzchowski

A cryogenic rectification system wherein low purity oxygen is recovered from a side column or the lower pressure column of a double column while a portion of the low purity oxygen is fed to an auxiliary column driven by fluid having a high nitrogen concentration wherein high purity oxygen is produced.

Cryogenic rectification system for producing low purity oxygen and high

A cryogenic rectification plant comprising a double column and a side column having a bottom reboiler wherein feed air is passed into the double column by way of the bottom reboiler and an auxiliary compressor is connected in parallel with the feed air line.

Cryogenic rectification apparatus for producing high purity oxygen or

A cryogenic rectification system wherein nitrogen top vapor of a higher pressure column reboils the column to provide additional vapor upflow and liquid downflow reflux for increased column drive and improved oxygen recovery.

Cryogenic rectification system with improved oxygen recovery

A system comprising a stripping column and a nitrogen rejection unit wherein a significant portion of the feed to the nitrogen rejection unit is provided at an increased pressure thus reducing product compression requirements.

Feed processing for nitrogen rejection unit

A cryogenic distillation system wherein a first heat exchange fluid transfers heat in part from a process stream to the bottom of a column, and in part from a process stream to a second heat exchange fluid and out of the system, thus generating net refrigeration.

Cryogenic distillation with unbalanced heat pump

A cryogenic rectification method wherein liquid from a top condenser-reboiler is cleaned of higher boiling impurities by passage through an adsorbent bed and returned to the condenser-reboiler, wherein the flow back to the condenser-reboiler is driven by combination with density-reducing vapor.

Air separation process with improved reboiler liquid cleaning circuit

A process to produce cold helium gas suitable for use as a feed to a helium liquifier comprising employing refrigeration from a nitrogen rejection unit to reduce the temperature of the helium gas just prior to its passage to the liquifier thus enabling a reduction in the liquifier energy requirement.

Process to produce cold helium gas for liquefaction

A process for more efficiently separating nitrogen and methane using a double column cryogenic rectification nitrogen rejection unit wherein feed is passed through a high pressure stripping column prior to the nitrogen rejection unit. As a result, higher pressure methane can be recovered with reduced compression requirements, and an upgraded feed to the nitrogen rejection unit enables more efficient separation.

Process to separate nitrogen and methane

A process for the separation of methane and nitrogen in a cryogenic distillation column driven by a closed loop recirculating fluid heat pump wherein additional column refrigeration is generated by rejecting process heat into a product stream thereby reducing the need for expansion of process streams and enabling recovery of product at relatively high pressure.

Process for separating methane and nitrogen

A cryogenic process to more efficiently separate nitrogen from a nitrogen-containing hydrocarbon stream wherein the separate recovery of natural gas liquids is increased and the final nitrogen removal from natural gas is accomplished at lower than conventional pressures. The nitrogen-methane separation column is driven by a closed loop heat pump circuit that utilizes a nitrogen-methane mixture.

Process to separate nitrogen from natural gas

A process which effectively separates and recovers natural gas liquids from a natural gas stream containing nitrogen, regardless of the magnitude of the nitrogen concentration or changes in the nitrogen concentration.

Process to separate natural gas liquids from nitrogen-containing natural

A cryogenic process to efficiently produce large quantities of nitrogen gas at elevated pressure by use of a double column and multiple condenser-reboilers.

Double column multiple condenser-reboiler high pressure nitrogen process

A process to efficiently produce large quantities of elevated pressure nitrogen at a high recovery by the cryogenic separation of air employing two separate columns each of which is equipped with a top condenser and wherein the second column processes a feed stream obtained from the first column.

Dual column high pressure nitrogen process

An air separation process wherein shelf vapor is employed for reversing heat exchanger cold end temperature control and is subsequently divided into two streams, one of which is expanded to provide plant refrigeration and the other is recovered as high pressure nitrogen-rich gas.

Split shelf vapor air separation process

An improved air separation process wherein a stream which is warmed to provide temperature control for a reversing heat exchanger and is expanded to generate plant refrigeration is desuperheated before being introduced to a low pressure distillation column. The process is particularly useful when argon is a desired product of the air separation.

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North Tonawanda, NY, United States of America

Ravindra F Pahade