Method for producing oxygen via O2 VSA, minimizing valve openings and closings

US11819796B2 · kind B2 · utility

Assignee

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

Inventors

• Guillaume Rodrigues · Le Plessis-Trévise, FR
• François Darrigade · Paris, FR
• Patrick Le Bot · Saint-Mandé, FR
• Pierre Petit · Verrières-le-Buisson, FR
• Stéphane Pusiol · Athis-Mons, FR
• Maxime Perez · Bussiares, FR

Key dates

• Filing date: Feb 25, 2019
• Grant date: Nov 21, 2023
• Expiry date: Sep 30, 2040

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2259/402
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for producing oxygen from air using vacuum swing adsorption by means of a unit including at least two adsorbers each following, with an offset a pressure cycle, with a decompression step including at least a co-current first decompression sub-step for the partial balancing of pressure with the other adsorber which is performing counter-current recompression by means of a balancing valve, and, at least for one cycle out of three, a dead time sub-step which succeeds the first decompression sub-step, the method including a pressure of X bar at the end of the first decompression sub-step for the cycles that do not have a dead time sub-step, and a pressure of X bar at the end of the dead time sub-step, opening the balancing valve identically during the first decompression sub-step and the dead time sub-step, for the cycles that do have a dead time sub-step.