A novel cryogenic vapor-recompression air separation unit integrated to oxyfuel combined-cycle gas-to-wire plant with carbon dioxide enhanced oil recovery: Energy and economic assessments

Key Applications and Potential Limitations of Ionic Liquid Membranes in the Gas Separation Process of CO2, CH4, N2, H2 or Mixtures of These Gases from Various Gas Streams

“…The gas separation process plays a crucial and a fundamental role in the chemical engineering industry as a result of its broad range of applications, ranging from carbon dioxide gas separation from natural gas [ 9 , 10 , 11 ], recovery of hydrogen from waste gas streams [ 12 ], production of nitrogen and oxygen-enriched gases. In the past decades, a large number of different methods for the separation of gases have been developed, including membrane separation [ 13 ], chemical looping [ 14 , 15 , 16 , 17 ] and cryogenic distillation [ 18 , 19 , 20 , 21 ]. The gas separation process using membrane technology depends on the sorption-diffusion mechanism or sieving [ 22 ].…”

Pretreatment Methods of Microalgae Biomass for Biogas Production

“…Combustion with nearly pure gaseous oxygen (GOX) implies in the production of flue gases constituted mainly by CO 2 +H 2 O, so that CO 2 is easily recovered after water condensation, being ready to be compressed for dispatch, unless finishing purification is needed depending on specificities of transport, storage and utilization (Pipitone;Bolland, 2009). The economic performance is highly dependent on air separation unit (ASU) capital investment and operating cost (Brigagão et al, 2019b), where cryogenic fractionation is currently the only economical route for large-scale GOX supply to oxy-combustion (Higginbotham et al, 2011). The most efficient cryogenic ASU ever developed for GOX production was presented by Brigagão et al (2019b), with basis on cryogenic top vapor recompression distillation with two reboilers (TVR-2REB) to produce GOX at nearly atmospheric pressure, requiring only 139 kWh/t O 2 for 95%mol O 2 .…”

“…The economic performance is highly dependent on air separation unit (ASU) capital investment and operating cost (Brigagão et al, 2019b), where cryogenic fractionation is currently the only economical route for large-scale GOX supply to oxy-combustion (Higginbotham et al, 2011). The most efficient cryogenic ASU ever developed for GOX production was presented by Brigagão et al (2019b), with basis on cryogenic top vapor recompression distillation with two reboilers (TVR-2REB) to produce GOX at nearly atmospheric pressure, requiring only 139 kWh/t O 2 for 95%mol O 2 . This nominal purity is conceived as a standard for oxyfuel power generation, because it avoids high power demand for Ar/O 2 fractionation, which occurs above 97%mol (Brigagão et al, 2019b).…”

“…The most efficient cryogenic ASU ever developed for GOX production was presented by Brigagão et al (2019b), with basis on cryogenic top vapor recompression distillation with two reboilers (TVR-2REB) to produce GOX at nearly atmospheric pressure, requiring only 139 kWh/t O 2 for 95%mol O 2 . This nominal purity is conceived as a standard for oxyfuel power generation, because it avoids high power demand for Ar/O 2 fractionation, which occurs above 97%mol (Brigagão et al, 2019b).…”

“…1). A higher CO 2 content would reduce the power demand for CO 2 compression, and this can be accomplished by using GOX at a greater purity (up to 98%mol for the best overall efficiency) in exchange to slightly higher separation power in the ASU (Brigagão et al, 2019b). Nevertheless, further purification unit would be necessary in case the CO 2 stream has to follow strict purity specifications.…”