The Boc Group, Inc.

Shuguang Deng

Ravi Kumar

Frank R Fitch

Adeola Florence Ojo

Craig S Gittleman

Martin B&uuml;low

Ravi Kumar Jain

Michael E Garrett

Martin Bulow

Qing Min Wang

Dongmin Shen

Norberto O Lemcoff

Mark J Andrecovich

Michael John Heywood

Rudolph J Wolf

Miu Ling Lau

Ralph John Whiteman

A process for producing a purified gaseous product from a gaseous feedstream such as air containing impurities is disclosed. The impurities such as hydrogen, water vapor, carbon monoxide and carbon dioxide are removed from the gaseous feedstream in a vessel having layers of adsorbents and oxidation catalysts. The placement of the hydrogen to water vapor conversion catalyst downstream of the step of contacting the feedstream with a catalyst to convert the carbon monoxide to the carbon dioxide and the step of removing the carbon dioxide from the feedstream improves not only performance but also the economies of the purification system.

Purification of gases

Metallo-organic polymers for gas separation and purification

Apparatus and method for controlling the composition of the atmosphere within a refrigerated container during the storage and/or transportation of perishable and/or respiring produce in which carbon dioxide and ethylene (and other evolved hydrocarbons) are removed from the container atmosphere by adsorption, the adsorptive materials being regenerated with ambient air.

Atmosphere control for perishable produce

The present invention provides for a multi-composite adsorbent mixture which will remove H O, CO and nitrogen oxides and/or hydrocarbons from a feed gas stream. The improvement lies in the use of a third adsorbent which is selective for nitrogen oxides, hydrocarbons or both.

Purification of gases using multi-composite adsorbent

Substantially all of the carbon dioxide is removed from a gas containing up to about 1% by volume carbon dioxide by subjecting the gas to a pressure swing adsorption process using a two layer adsorption system, wherein the first layer contains activated alumina and the second layer is a zeolite or a combination of zeolites having a silicon to aluminum atomic ratio of at least 1.5. The process is particularly suitable for removing substantially all carbon dioxide and water vapor contained in air prior to subjecting the air to cryogenic distillation.

Air purification process

Substantially all of the carbon dioxide is removed from a gas containing up to about 1% by volume carbon dioxide by subjecting the gas to a pressure swing adsorption process using as the adsorbent a single layer of zeolite having a silicon to aluminum atomic ratio in the range of 1.5 to 70. The process is particularly suitable for removing substantially all carbon dioxide and water vapor contained in air prior to subjecting the air to cryogenic distillation.

An activated alumina adsorbent used in a PSA air prepurification process for removal of carbon dioxide from the air is thermally regenerated when the carbon dioxide content remaining in the adsorbent following an adsorbent regeneration step of the PSA process reaches a certain level.

Air purification process with thermal regeneration

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Somerville, NJ, United States of America

Shuguang Deng