Adsorption of propane and propylene in zeolite 4A honeycomb monolith

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Grande, CA (Author) Other; Cavenati, S (Author) Other; Barcia, P (Author) Other; Hammer, J (Author) Other; Fritz, HG (Author) Other; Alírio Rodrigues (Author) FEUP

Journal

Title: Chemical Engineering Science

Vol. 61 No. 2

Pages: 3053-3067

ISSN: 0009-2509

Publisher: Elsevier

Indexing

ISI Proceedings

ISI Web of Knowledge - 30 Citations

Scopus - 30 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-004-KW9

DOI: 10.1016/j.ces.2005.11.058

Resumo (PT): One of the developments in separation technologies by adsorption is the use of new shaped structured materials offering some attractive properties rather than pellet or extrudates behavior. Monolithic adsorbents have actually been studied in a wide range of applications. It is the purpose of this work to report the behavior of a square honeycomb monolith containing zeolite 4A crystals inserted by extrusion. Adsorption equilibrium of pure gases was measured at 423 and 473K in a Rubotherm microbalance, and data were in agreement with commercial extrudates data. Diffusivity coefficients of propylene were determined by uptake curves at low pressures; D-c(423) = 0.56 x 10(-17) m(2)/s and D-c(473)=2.00 x 10(-17) m(2)/s. These values are three orders of magnitude smallerthan that of previous data measured in commercial extrudates due to partial blocking of the micropores of the zeolite with one of the materials used in the monolith preparation. A complete mathematical 3D-distributed parameter model for fixed-bed adsorption of dilute streams in monoliths composed of materials with bidisperse structure was developed.

Abstract (EN): One of the developments in separation technologies by adsorption is the use of new shaped structured materials offering some attractive properties rather than pellet or extrudates behavior. Monolithic adsorbents have actually been studied in a wide range of applications. It is the purpose of this work to report the behavior of a square honeycomb monolith containing zeolite 4A crystals inserted by extrusion. Adsorption equilibrium of pure gases was measured at 423 and 473K in a Rubotherm microbalance, and data were in agreement with commercial extrudates data. Diffusivity coefficients of propylene were determined by uptake curves at low pressures; D-c(423) = 0.56 x 10(-17) m(2)/s and D-c(473)=2.00 x 10(-17) m(2)/s. These values are three orders of magnitude smallerthan that of previous data measured in commercial extrudates due to partial blocking of the micropores of the zeolite with one of the materials used in the monolith preparation. A complete mathematical 3D-distributed parameter model for fixed-bed adsorption of dilute streams in monoliths composed of materials with bidisperse structure was developed. A more simplified model in ID was also used for description of adiabatic bulk adsorption. Breakthrough curves of propylene diluted in helium at three different partial pressures (1.5, 5.6 and 10.0kPa) were measured to validate both models.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15