A modeling study of vacuum sorption characteristics of carbon dioxide on 4A zeolite molecular sieves

Technical Report · Sat Aug 01 04:00:00 EDT 1987

DOI:https://doi.org/10.2172/6038249· OSTI ID:6038249

Prazniak, J. K.; Byers, C. H.

A model is presented to describe the isothermal adsorption of carbon dioxide (CO/sub 2/) and of nitrogen (N/sub 2/) on 4A zeolite molecular sieves under cryogenic conditions. The model is comprised of a fluid-phase mass balance representing the dynamics of gas in the bed and a one-dimensional diffusion equation representing adsorption in the solid. Cubic crystals of 4A zeolite are assumed to be spherical, and the concentration dependence of the diffusivity of the sorbate in both the gas and solid phases is considered. Numerical solution of the parabolic partial differential model equations is accomplished using orthogonal collocation in conjunction with an ordinary differential equation integrator suitable for stiff equations. 34 refs., 18 figs., 5 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA); Tennessee Univ., Knoxville (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6038249
• Report Number(s): ORNL/TM-10327; ON: DE88000042
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ADSORBENTS
ADSORPTION
ADSORPTION ISOTHERMS
ALKALI METALS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CRYOPUMPS
DIFFERENTIAL EQUATIONS
ELEMENTS
EQUATIONS
EQUIPMENT
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTHERMS
LABORATORY EQUIPMENT
MATERIALS
MATHEMATICAL MODELS
METALS
MINERALS
MOLECULAR SIEVES
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POROUS MATERIALS
PRESSURE DROP
PUMPS
SODIUM
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
VACUUM PUMPS
ZEOLITES