Lithium type X zeolite as a superior sorbent for air separation

Journal Article · Sat Feb 29 23:00:00 EST 1992 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399208018880· OSTI ID:5170233

Baksh, M S.A.; Kikkinides, E S; Yang, R T ^[1]

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1. New York State Univ., Buffalo (United States)

Li-X, Ba-X, and Li-A zeolites are prepared by ion exchange with the commercial Na-X (13X) and Na-A(4A) zeolites. At the ambient temperature (298K), only Li-X exhibits a significant enhancement of the N{sub 2}/O{sub 2} adsorption selectivity over Li-X exhibits a significant enhancement of the N{sub 2}/O{sub 2} adsorption selectivity over the commercial zeolites. At a pressure of 1 atm, the N{sub 2}/O{sub 2} selectivity is increased from approximately 3 for 13X and 4A to approximately 7 for Li-X. Air separations by the two sorbents Li-X and Na-X are compared using a commercial 5-step air-separation pressure swing adsorption (PS) cycle. The comparison is made by using a mathematical model of proven predictive ability. A parametric comparison shows superior separation results for the Li-X zeolite under all PSA conditions. For example, the Li-X sorbent gives >90% O{sub 2} purity and an O{sub 2} recovery of over 70% at a feed rate of >5.65 {times} 10{sup 5} L STP/h. In addition, for the same O{sub 2} purity and feed rate, the Na-X sorbent gives an O{sub 2} recovery of less than 30%. Hence the replacement of the commercially used Na-X sorbent by the Li-X sorbent will result in an energy saving of over 50%.

• OSTI ID: 5170233
• Journal Information: Separation Science and Technology; (United States), Journal Name: Separation Science and Technology; (United States) Vol. 27:3; ISSN 0149-6395; ISSN SSTED
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320302* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Materials
ADSORPTION
ADSORPTION ISOTHERMS
AIR
BOUNDARY CONDITIONS
CHEMICAL PREPARATION
DATA
ELEMENTS
ENERGY CONSERVATION
EXPERIMENTAL DATA
FLOW RATE
FLUID FLOW
FLUIDS
GAS FLOW
GASES
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
ISOTHERMS
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
MATHEMATICAL MODELS
MINERALS
NITROGEN
NONMETALS
NUMERICAL DATA
OXYGEN
PARAMETRIC ANALYSIS
PERFORMANCE TESTING
PROCESSING
SEPARATION PROCESSES
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS
TESTING
WASTE MANAGEMENT
WASTE PROCESSING
ZEOLITES