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Available online at www.sciencedirect.com Energy Procedia 00 (2016) 000–000 The 8th International Conference on Applied Energy – ICAE2016 Evaluation of biogas upgrading using ionic liquids with the integrated anaerobic digestion process Yujiao Xiea*, Johanna Björkmalmb, Karin Willquistb, Johan Yngvessonb, Chunyan Maa, Xiaoyan Jia† aEnergy Engineering, Division of Energy Science, Luleå University of Technology, 971 87 Luleå, Sweden bSP Technical Research Institute of Sweden, Box 857, 501 15 Borås, Sweden Abstract The energy efficiency of biogas upgrading using different ionic liquid solvents was assessed with the integration of industrial anaerobic digestion processes. The upgrading processes with 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]), aqueous choline chloride/urea (ChCl/Urea), and aqueous 1-allyl- 3-methyl imidazole formate ([Amim][HCOO]) were simulated in Aspen Plus and compared with the water scrubbing technique. The comparison between the solvents in respect to the amount of recirculated solvents and energy usage for biogas upgrading using different solvents show the following order: aqueous [Amim][HCOO] < aqueous ChCl/Urea < [bmim][Tf2N] < water. Meanwhile, the operation and maintenance data from six different co- digestion plants was surveyed and collected. It shows that different anaerobic digestion (AD) facilities have different capacities and produce raw biogas with differing methane content depending on the type of substrate and the digestion system, and this significantly affects energy usage of the upgrading system. The simulation shows that the usage of ionic liquid based upgrading was lower than the actual energy usage of conventional upgrading techniques in Scandinavian AD plants, and the increases of methane content and raw biogas flow rate decrease the energy usage of biogas upgrading based on the sensitivity analysis. Keywords: biogas upgrading; ionic liquids; process simulation; anaerobic digestion 1. Introduction Energy security and climate change concerns have resulted in increased attention towards renewable energy. Biogas is a promising renewable energy alternative due to the flexibility of anaerobic digestion where a spectrum of organic substrates, such as manure, sewage sludge, energy crops, the organic fractions of household waste and industrial waste can be used [1, 2]. Consequentially, the biogas * Corresponding author: Tel.: +46(0)920 492589 E-mail addresses: Yujiao.xie@ltu.se † Corresponding author: Tel.: +46(0)920 492837 E-mail addresses: xiaoyan.ji@ltu.se www.elsevier.com/locate/procediaPDF Image | CO2 Separation with Ionic Liquids
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