Production and installation for the production of gaseous nitrogen at several different purities

US5333463A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Catherine Garnier · Paris, FR
• Francois Venet · Paris, FR

Key dates

• Filing date: Jun 22, 1993
• Grant date: Aug 2, 1994
• Expiry date: Jun 22, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S62/92
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A column for production of nitrogen by the distillation of air, adapted to produce high purity nitrogen at its head, is associated with an external source of medium purity liquid nitrogen that is fitted with a device for the liquid phase adsorption of carbon monoxide, and with a reservoir for the storage of high purity liquid nitrogen. The column produces medium purity gaseous nitrogen and high purity gaseous nitrogen by direct withdrawals, optionally supplemented by vaporization of liquid nitrogen.