Journal article

Upgrading Biogas at Low Pressure by Vacuum Swing Adsorption

Aarti Arya, Swapnil Divekar, Ruchika Rawat, Pushpa Gupta, Madhukar O Garg, Soumen Dasgupta, Anshu Nanoti, Ranjeet Singh, Penny Xiao, Paul A Webley

Industrial & Engineering Chemistry Research | AMER CHEMICAL SOC | Published : 2015

Abstract

Performance of four adsorbents (three zeolites and one molecular sieve carbon) for CO ?CH separation from simulated biogas feed containing 42% CO (balance methane) is compared in a simple four step dual bed vacuum swing adsorption (VSA) cycle. The VSA cycle consisted of four sequential steps in each column namely adsorption, cocurrent depressurization, evacuation and pressure equalization. Among the adsorbents tested, zeolite NaUSY appears to give the best results for producing pipeline grade methane (>98%) at recoveries exceeding 85%. The methane productivity obtained by the present process is in the range of 11?16 mol/h/kg, which is considerably higher than the literature reported values..

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Grants

Awarded by DST, India


Funding Acknowledgements

We acknowledge Dr. A. N. Goswami, Ex. Chief Scientist, Indian Institute of Petroleum, Dehradun, India for helpful discussion and suggestion in simulation and modeling of breakthrough curves. We are grateful for financial support from DST, India under the Indo-Australia Strategic Research Fund (AISRF) in the form of a project grant (DST/INT/AUS/P-35/2010).