Limits for Air Separation by Adsorption with LiX Zeolite

Salil U. Rege; Ralph T. Yang

doi:10.1021/ie9705214

Limits for Air Separation by Adsorption with LiX Zeolite

Salil U. Rege
, Ralph T. Yang

Department of Chemical and Biological Engineering

University of Michigan, Ann Arbor

Research output: Contribution to journal › Article › peer-review

166 Scopus citations

Abstract

In the present work the performance of two zeolite sorbents, namely LiX (Al/Si = 1 with 100% Li⁺) and NaX (13X), is compared for air separation by pressure swing adsorption, with particular attention focused on the limits in the adsorption/desorption pressure ratio. The product (O₂) recovery was optimized for the two sorbents at different pressure ratios (2-10), keeping the product purity and product throughput nearly constant. It was found that in the case of the LiX zeolite it is possible to operate at a pressure ratio as low as 2 with only a slight decrease in product recovery, compared to the limit of 4 for NaX. The temperature excursion in the LiX bed was 4 times that in the NaX bed. Substitution of a portion of the LiX sorbent by inert, high-heat-capacity particles (e.g., iron) in the bed decreased the temperature excursion significantly. It was shown that an optimal amount of 5-10% (v/v) of inert substitution (at the same total bed volume) could increase the O₂ product recovery by 2%.

Original language	English
Pages (from-to)	5358-5365
Number of pages	8
Journal	Industrial and Engineering Chemistry Research
Volume	36
Issue number	12
DOIs	https://doi.org/10.1021/ie9705214
State	Published - Dec 1997

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title = "Limits for Air Separation by Adsorption with LiX Zeolite",

abstract = "In the present work the performance of two zeolite sorbents, namely LiX (Al/Si = 1 with 100\% Li+) and NaX (13X), is compared for air separation by pressure swing adsorption, with particular attention focused on the limits in the adsorption/desorption pressure ratio. The product (O2) recovery was optimized for the two sorbents at different pressure ratios (2-10), keeping the product purity and product throughput nearly constant. It was found that in the case of the LiX zeolite it is possible to operate at a pressure ratio as low as 2 with only a slight decrease in product recovery, compared to the limit of 4 for NaX. The temperature excursion in the LiX bed was 4 times that in the NaX bed. Substitution of a portion of the LiX sorbent by inert, high-heat-capacity particles (e.g., iron) in the bed decreased the temperature excursion significantly. It was shown that an optimal amount of 5-10\% (v/v) of inert substitution (at the same total bed volume) could increase the O2 product recovery by 2\%.",

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T1 - Limits for Air Separation by Adsorption with LiX Zeolite

AU - Rege, Salil U.

AU - Yang, Ralph T.

PY - 1997/12

Y1 - 1997/12

N2 - In the present work the performance of two zeolite sorbents, namely LiX (Al/Si = 1 with 100% Li+) and NaX (13X), is compared for air separation by pressure swing adsorption, with particular attention focused on the limits in the adsorption/desorption pressure ratio. The product (O2) recovery was optimized for the two sorbents at different pressure ratios (2-10), keeping the product purity and product throughput nearly constant. It was found that in the case of the LiX zeolite it is possible to operate at a pressure ratio as low as 2 with only a slight decrease in product recovery, compared to the limit of 4 for NaX. The temperature excursion in the LiX bed was 4 times that in the NaX bed. Substitution of a portion of the LiX sorbent by inert, high-heat-capacity particles (e.g., iron) in the bed decreased the temperature excursion significantly. It was shown that an optimal amount of 5-10% (v/v) of inert substitution (at the same total bed volume) could increase the O2 product recovery by 2%.

AB - In the present work the performance of two zeolite sorbents, namely LiX (Al/Si = 1 with 100% Li+) and NaX (13X), is compared for air separation by pressure swing adsorption, with particular attention focused on the limits in the adsorption/desorption pressure ratio. The product (O2) recovery was optimized for the two sorbents at different pressure ratios (2-10), keeping the product purity and product throughput nearly constant. It was found that in the case of the LiX zeolite it is possible to operate at a pressure ratio as low as 2 with only a slight decrease in product recovery, compared to the limit of 4 for NaX. The temperature excursion in the LiX bed was 4 times that in the NaX bed. Substitution of a portion of the LiX sorbent by inert, high-heat-capacity particles (e.g., iron) in the bed decreased the temperature excursion significantly. It was shown that an optimal amount of 5-10% (v/v) of inert substitution (at the same total bed volume) could increase the O2 product recovery by 2%.

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

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ER -

Limits for Air Separation by Adsorption with LiX Zeolite

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