Olefin–Paraffin Separation Using Calcium-ETS‑4

The properties of calcium-modified ETS-4 are studied focusing on olefin–paraffin separation by PSA (Pressure Swing Adsorption), specifically a stream containing CH4/C2H6/C2H4. The effect of activation temperature of Ca-ETS-4 is studied to perform a kinetic separation, with the aim of excluding paraf...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2014-10, Vol.53 (40), p.15522-15530
Main Authors: Grande, Carlos A, Lind, Anna, Vistad, Ørnulv, Akporiaye, Duncan
Format: Article
Language:English
Subjects:
Activation
Constants
Crystal lattices
Diffusion
Diffusion rate
Heating
Paraffins
Pressure swing adsorption
Separation
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Summary:The properties of calcium-modified ETS-4 are studied focusing on olefin–paraffin separation by PSA (Pressure Swing Adsorption), specifically a stream containing CH4/C2H6/C2H4. The effect of activation temperature of Ca-ETS-4 is studied to perform a kinetic separation, with the aim of excluding paraffin molecules from the pores. Adsorption isotherms of pure CH4, C2H6, and C2H4 were measured at 303 K after activating the sample at different temperatures (from 463–583 K). Furthermore, pulse chromatography of single gases at 303 K was carried out after different activation temperatures to determine the heating effect on diffusion of pure gases. Aiming to develop a faster procedure to determine optimal activation temperature for alkali-exchanged ETS-4, a correlation between changes in the crystal lattice parameters from in situ XRD and the diffusion constant has been established for Ca-ETS-4.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie5004703