Air Products and Chemicals, Inc.

Joan M Schork

Charles G Coe

John N Armor

Steven R Auvil

Robert George Syvret

Thomas Stephen Farris

Rajagopalan S Srinivasan

Beth Ann Campion

Gregory Alan Cooper

A method for the production of nitrogen trifluoride from a fluorine reactant and an ammonium ion source that is dispersed within a liquid phase reaction mixture containing one or more perfluorocarbon fluids is disclosed herein. In one embodiment, the fluorine reactant is introduced to the reaction mixture at a temperature that ranges from 90&#xb0; C. to 120&#xb0; C. In this embodiment, the percentage yield of nitrogen trifluoride may be about 80% or greater.

Method for nitrogen trifluoride production

Nitrogen is produced by separating air in a pressure swing adsorption process using a high capacity kinetically O.sub.2 selective material as the adsorbent. An example of such an adsorbent is a carbon molecular sieve made from coconut shell char. Such a coconut shell char having a high oxygen volumetric capacity is provided by crushing and sizing coconut shells to form granules which are then heated in flowing inert gas at a temperature ramp rate of about 2 to 12.degree. C. per minute to a peak temperature of 775 to 900.degree. C. which is then held so that the total heating time is up to 8 hours and thereafter the granular char is cooled in an inert gas atmosphere. The granular char thus produced is kinetically selective for O.sub.2 over N.sub.2 without further modification to narrow the openings of its micropores and has an oxygen volumetric capacity in excess of 8.0 cc/cc at 1 atm. and ambient temperature. Further modification of this char is provided by contacting it with an oxidizing atmosphere of carbon dioxide or a mixture of inert gas and carbon dioxide, H.sub.2 O or O.sub.2 at temperatures ranging from 650.degree. to 900.degree. C. until the gasified char has been altered so that its volumetric oxygen capacity is greater than 9.0 cc/cc at 1 atm. and ambient temperature.

Air separation by pressure swing adsorption with a high capacity carbon

A coconut shell char having a high oxygen volumetric capacity is provided by crushing and sizing coconut shells to form granules which are then heated in flowing inert gas at a temperature ramp rate of about 2.degree. to 12.degree. C. per minute to a peak temperature of 775.degree. to 900.degree. C. which is then held so that the total heating time is up to 8 hours and thereafter the granular char is cooled in an inert gas atmosphere. The granular char thus produced is oxygen selective in air separation without further modification to narrow the openings of its micropores and has an oxygen volumetric capacity in excess of 8.0 cc/cc. Further modification of this char is provided by contacting it with an oxidizing atmosphere of carbon dioxide or a mixture of inert gas and carbon dioxide, H.sub.2 O or O.sub.2 at temperatures ranging from 650.degree. to 900.degree. C. until the gasified char has been altered so that its volumetric oxygen capacity is greater than 9.0 cc/cc. The coconut shell char can be further modified directly as prepared or following a gasification procedure by treatment with volatile carbon-containing organic compound which is pyrolyzed to form carbon which reduces the effective pore openings of the original or gasified char.

High capacity coconut shell char for carbon molecular sieves

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Allentown, PA, United States of America

Joan M Schork