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Cs-Bentonite Clay for Biogas Upgrading: A Numerical Assessment
Niels Mendel1, Jordanus J P Jordi Boon2, Igor Sîreţanu1
1Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Industrial & Engineering Chemistry Research
|April 28, 2025
Summary
This study numerically evaluates Cs-exchanged bentonite clay for biogas upgrading via vacuum-pressure swing adsorption. Cs-bentonite offers high methane recovery and purity at low energy consumption, making it a cost-effective alternative for biogas purification.
Area of Science:
- Chemical Engineering
- Materials Science
- Environmental Science
Background:
- Biogas upgrading is crucial for producing biomethane, with vacuum-pressure swing adsorption (VPSA) being a key separation technology.
- Selective CO2 adsorption over CH4 on sorbent materials is the core principle of VPSA for biogas purification.
- Cs-exchanged bentonite clay has been previously characterized as a potential sorbent for CO2/CH4 separation.
Purpose of the Study:
- To numerically assess the performance of Cs-exchanged bentonite clay for biogas upgrading using VPSA.
- To benchmark the effects of process configurations, ambient temperature, and feed biogas composition on separation efficiency.
- To determine optimal operating parameters for maximizing productivity and minimizing energy consumption while meeting purity and recovery targets.
Main Methods:
- Numerical simulation of a VPSA process using Cs-exchanged bentonite clay as the sorbent.
- Evaluation of seven different process cycle configurations, ranging from single-stage to three-column systems.
- Analysis of the impact of ambient temperature (15-25 °C) and feed biogas composition (35-45% CO2) on performance metrics.
Main Results:
- A two-column VPSA unit achieved a methane (CH4) purity of 0.906 and a recovery of 0.967 with a specific energy consumption of 0.072 kWh/Nm3 CH4.
- Optimal performance was demonstrated for upgrading biogas with 45% CO2 at ambient feed pressure.
- Increased column numbers and pressure equalization steps further improved CH4 recovery, while favorable CO2 adsorption isotherms contributed to low energy use.
Conclusions:
- Cs-exchanged bentonite clay is a highly effective and cost-efficient sorbent for biogas upgrading via VPSA.
- Its high CO2/CH4 selectivity and favorable adsorption characteristics result in high methane recovery and low specific energy consumption.
- Cs-bentonite presents a compelling alternative to conventional sorbent materials for industrial biogas purification applications.
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