LAPSE:2020.1216
Published Article
LAPSE:2020.1216
Upgrading of Biogas to Methane Based on Adsorption
Jun Liu, Qiang Chen, Peng Qi
December 17, 2020
Upgrading raw biogas to methane (CH4) is a vital prerequisite for the utilization of biogas as a vehicle fuel or the similar field as well. In this work, biogas yield from the anaerobic fermentation of food waste containing methane (CH4, 60.4%), carbon dioxide (CO2, 29.1%), hydrogen sulfide (H2S, 1.5%), nitrogen (N2, 7.35%) and oxygen (O2, 1.6%) was upgraded by dynamic adsorption. The hydrogen sulfide was removed from the biogas in advance by iron oxide (Fe2O3) because of its corrosion of the equipment. Commercial 13X zeolite and carbon molecular sieve (CMS) were used to remove the other impurity gases from wet or dry biogas. It was found that neither 13X zeolite nor CMS could effectively remove each of the impurities in the wet biogas for the effect of water vapor. However, 13X zeolite could effectively remove CO2 after the biogas was dried with silica and showed a CO2 adsorption capacity of 78 mg/g at the condition of 0.2 MPa and 25 °C. Additionally, 13X zeolite almost did not adsorb nitrogen (N2), so the CH4 was merely boosted to ac. 91% after the desulfurated dry biogas passed through 13X zeolite, nitrogen remaining in the biogas. CMS would exhibit superior N2 adsorption capacity and low CO2 adsorption capacity if some N2 was present in biogas, so CMS was able to remove all the nitrogen and fractional carbon dioxide from the desulfurated dry biogas in a period of time. Finally, when the desulfurated dry biogas passed through CMS and 13X zeolite in turn, the N2 and CO2 were sequentially removed, and then followed the high purity CH4 (≥96%).
Keywords
13X zeolite, Adsorption, biogas, carbon molecular sieve, methane
Subject
Suggested Citation
Liu J, Chen Q, Qi P. Upgrading of Biogas to Methane Based on Adsorption. (2020). LAPSE:2020.1216
Author Affiliations
Liu J: Industrial Center, Harbin Vocational and Technical College, Harbin 150030, China; School of Mechanical Engineering, Harbin Vocational and Technical College, Harbin 150030, China
Chen Q: Industrial Center, Harbin Vocational and Technical College, Harbin 150030, China
Qi P: School of Mechanical Engineering, Harbin Vocational and Technical College, Harbin 150030, China
Journal Name
Processes
Volume
8
Issue
8
Article Number
E941
Year
2020
Publication Date
2020-08-05
Published Version
ISSN
2227-9717
Version Comments
Original Submission
Other Meta
PII: pr8080941, Publication Type: Journal Article
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LAPSE:2020.1216
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doi:10.3390/pr8080941
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Dec 17, 2020
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CC BY 4.0
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[v1] (Original Submission)
Dec 17, 2020
 
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Dec 17, 2020
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https://psecommunity.org/LAPSE:2020.1216
 
Original Submitter
Calvin Tsay
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