Analysis of Non-isobaric Steps in Bicomponent PSA Systems. Application to Air Separation

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Adélio M. M. Mendes (Author) FEUP; Carlos A. Costa (Author) FEUP; Alírio E. Rodrigues (Author) FEUP

Journal

Title: Industrial & Engineering Chemistry Research

Vol. 38

Pages: 138-145

ISSN: 0888-5885

Publisher: American Chemical Society

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Abstract (EN): This paper presents a simulation study using a pressure swing adsorption unit performing an equilibrium-based bicomponent separation, running a traditional Skarstrom cycle. This study is also supported by experimental results obtained for oxygen separation from air in a 5A zeolite. The focus is on the influence on product purity and recovery of the pressure rising rate during pressurization, pressure lowering rate during blowdown, production pressure, and intraparticle viscous flow. A co-current equalization step is also considered. Within the range of tested conditions, it was found that the pressure rising rate during pressurization influences product purity and recovery whereas the pressure lowering rate during blowdown has almost no effect. It was concluded that higher pressurization rates decrease product purity and recovery. Intraparticle viscous flow can enhance or decrease product purity depending on the relationship between diffusional and intraparticle viscous flow contributions and an axial head loss. The production pressure has a complex effect on product purity and recovery, and there is some system-dependent optimal value. Use of a co-current equalization step always enhances product purity and recovery.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8