Air purification process

US5980611A · kind A · utility

Assignee

• The BOC Group Limited · US

Inventors

• Ravi Kumar · Allentown, US
• Shuguang Deng · Somerville, US
• Martin Bulow
• Frank R. Fitch · New York, US
• Adeola Florence Ojo · Pleasant Hill, US
• Craig S. Gittleman · Brighton, US

Key dates

• Filing date: Sep 25, 1997
• Grant date: Nov 9, 1999
• Expiry date: Sep 25, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02C20/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

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.