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Received May 5, 2023
Accepted September 3, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Performance Evaluation of Static and Dynamic CO 2 Adsorption from Synthetic Gas Condensates Using Zinc Oxide, Silicon Dioxide and Zeolite 13X
Abstract
This paper evaluated ZnO, SiO 2 and zeolite 13X for removing CO 2 from normal heptane (nC 7 ) as synthetic gas condensates
in batch mode. Based on the results of CO 2 adsorption isotherms, zeolite 13X had the highest CO 2 uptake in 1400–3700 ppm
at atmospheric pressure. Due to the higher specifi c surface area of granular zeolite 13X, its CO 2 uptake was more than that
of zeolite 13X powder. Also, the CO 2 adsorption equilibrium time was less than 30 min for zeolite 13X powder. The selectivity
of zeolite 13X powder (i.e., H 2 S/CO 2 ) was 2.36–4.08 for 2001–3930 ppm H 2 S with 1668 ppm CO 2 . Besides, the CO 2
breakthrough time for zeolite 13X powder was 50–4 min for WHSV (weight hourly space velocity) = 5–20 h −1 at 30 bar in
continuous mode. Additionally, for the increased CO 2 concentration from 1000 to 3000 ppm, the CO 2 breakthrough time
decreased from 30 to 11 min with WHSV = 10 h −1 . The CO 2 breakthrough time diminished by 2.5-fold as the pressure was
reduced from 30 bar to atmosphere for the initial CO 2 concentration of 1000 ppm in nC 7 and WHSV = 10 h −1 . Subsequently,
the regeneration of zeolite 13X by stagnant hot air was investigated for the CO 2 concentration range of 1000–3000 ppm,
air-adsorbent contact time range of 30–180 min and temperature range of 100–300 °C using Box–Behnken design. Its regeneration
effi ciency was more than 95% for the CO 2 concentration below 1000 ppm.
