New sorbents for olefin/paraffin separations and olefin purification for C{sub 4} hydrocarbons

Journal Article · Fri Oct 01 04:00:00 EDT 1999 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie980779+· OSTI ID:20000975

Padin, J; Yang, R T; Munson, C L

New adsorbents for olefin/paraffin separations are synthesized by incipient wetness impregnation and ion exchange of Ag{sup +} cations on high-surface-area substrates. The separation/purification is achieved by selective adsorption of olefins and/or dienes by {pi}-complexation. It was shown that the monolayer AgNO{sub 3}/SiO{sub 2} sorbent has a selective adsorption ratio of 8.33 for butene/butane at 70 C and 1 atm. The isotherm linearity for olefin is ideally suited for cyclic adsorption-desorption processes. Moreover, the performance of the {pi}-complexation sorbent (AgY zeolite) for the purification of butene by removal of trace amounts of butadiene was found to be superior to that of sorbents based on physical adsorption (5A zeolite and NaY). It was also shown that the Horvath-Kawazoe (H-K) model (using the Cheng-Yang version for spherical pores and correction for isotherm nonlinearity) is capable of predicting the adsorption behavior of the C{sub 4} hydrocarbons on 5A zeolite. Because the H-K model only involves dispersion forces, it underpredicts for gas-solid systems in which other forces also exist such as electrostatic and {pi}-complexation. C{sub 4}H{sub 6}/C{sub 4}H{sub 8} on 5A zeolite is one of these systems.

• Research Organization: Univ. of Michigan, Ann Arbor, MI (US)
• OSTI ID: 20000975
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 10 Vol. 38; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ADSORBENTS
BUTADIENE
BUTANE
BUTENES
REMOVAL
SEPARATION PROCESSES
SILICON OXIDES
SILVER NITRATES
SORPTIVE PROPERTIES
ZEOLITES