Review
Engineering, Chemical
Danny Shade, Brandon W. S. Bout, David S. Sholl, Krista S. Walton
Summary: Adsorption separation systems can save energy by replacing or enhancing traditional separation systems, but the ability to measure adsorption of gas mixtures still has deficiencies. This work provides a comprehensive overview of 18 techniques used to measure mixture adsorption, including the strengths and shortcomings of each method, and offers recommendations for experimentalists and future prospects.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Chemistry, Physical
Andrey Lider, Viktor Kudiiarov, Nikita Kurdyumov, Jinzhe Lyu, Maxim Koptsev, Nahum Travitzky, Dachamir Hotza
Summary: Hydrogen is a high-quality, clean energy carrier and essential for solving the climate problem. The production of high-purity hydrogen is crucial for new chemical processes and high-efficiency fuel cells. Membrane technology shows promise for hydrogen purification and separation due to its scalability and high degree of purification.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Dan Guo, Xuewen Cao, Lihui Ma, Pan Zhang, Yang Liu, Jiang Bian
Summary: This study systematically analyzed the density, interfacial characteristics, and adsorption of methane-heavy hydrocarbon mixtures. The results showed that the density of the heavy hydrocarbon-rich phase decreases with decreasing chain length and increasing pressure, while the methane-rich phase increases. When methane molecules dissolve into the bulk liquids, the heavy hydrocarbon chains stretch and the intermolecular separation distances increase. The interaction energy between the two molecules is the main cause of system swelling. The adsorption of methane improves with increasing pressure until reaching saturation. The strong adsorption of methane mainly occurs in the first surface layer in dilute solutions and becomes more pronounced with increasing methane fraction. For heavy hydrocarbons with shorter chains, the surface layers are narrower and the separation distances are reduced. Furthermore, methane molecules prefer to stay at the outer edge of the surface layers and are closer to the gas phase than heavy hydrocarbons by approximately 0.2-0.7 & ANGS;.
Article
Engineering, Environmental
Benjamin Claessens, Gille R. Wittevrongel, Fernando Rey, Susana Valencia, Julien Cousin-Saint-Remi, Gino V. Baron, Joeri F. M. Denayer
Summary: The study found that the hydrophobic all-silica beta zeolite has high selectivity for recovering isobutanol from vapor mixtures, with excellent mass transfer properties and promising recovery efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Dingyu Li, Zijian Ye, Jixiang Tang, Xuanyin Wang
Summary: This paper proposes a novel measurement system for accurately measuring the opening area of gas valves. The system uses top lighting and camera exposure to enhance the saliency of the valve opening, and applies subpixel location based on the rotating area effect to obtain precise edge position. The area computation is done based on the minimum circumscribed circle and the maximum inner circle of the edge.
Article
Engineering, Environmental
Dameng Liu, Yanbin Yao, Yanhai Chang
Summary: Evaluation of free and adsorption gas in the in-situ reservoir is important for coalbed methane exploration and production. Current methods for estimating the adsorbed gas content have limitations due to unreasonable or questionable mathematical assumptions. This study proposes a method using NMR and excess isothermal adsorption experiments to accurately quantify free and adsorbed methane in the reservoir.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Biotechnology & Applied Microbiology
Ivan Schlembach, Alexander Gruenberger, Miriam A. Rosenbaum, Lars Regestein
Summary: Microbial mixed cultures are gaining attention for biotechnological production due to their untapped potential, but their complexity requires identification and control of various parameters for stable processes. This review discusses the advantages and disadvantages of existing measurement techniques, highlights promising examples, and explores challenges and emerging technologies.
TRENDS IN BIOTECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Megumi Mukoyoshi, Mitsuhiko Maesato, Shogo Kawaguchi, Yoshiki Kubota, Keigo Cho, Yasutaka Kitagawa, Hiroshi Kitagawa
Summary: Mixed-metal metal-organic frameworks (MOFs) have significant importance in magnetic materials research. The magnetic properties of CoxNi1-x-MOF-74 were systematically studied, showing different behaviors with varying compositions of cobalt and nickel. The magnetic interaction of CoxNi1-x-MOF-74 can be altered by the adsorption of C2H4.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Chemical
Yalou Guo, Vincent Jusko, Gongkui Xiao, Jurgen Hanekom, Guoping Hu, Paul A. Webley, Eric F. May, Gang Kevin Li
Summary: This study proposes a new adsorption process, triple-reflux PSA (TR-PSA), to simultaneously separate ternary mixtures. The TR-PSA process successfully obtains three enriched products in a single stage, with comparable separation performance to the double-stage DR-PSA but significantly lower capital and energy cost.
Article
Chemistry, Multidisciplinary
Yi Wei, Fengshi Qi, Yunhe Li, Xiubo Min, Qi Wang, Jiangliang Hu, Tianjun Sun
Summary: Capture and separation of xenon and krypton using hydrophobic zinc-based framework CALF-20 were investigated. CALF-20 exhibited excellent stability and high adsorption capacity and selectivity for xenon, making it suitable for Xe capture and Xe/Kr separation.
Article
Chemistry, Physical
Iris Burgers, Leila Dehdari, Penny Xiao, Kevin Gang Li, Earl Goetheer, Paul Webley
Summary: This study proposes a pressure swing adsorption system for separating hydrogen from natural gas and evaluates the economic feasibility of supplying hydrogen at a refuelling station using this system. The findings suggest that hydrogen supplied by a pressure swing adsorption system is economically viable. Additionally, the study compares the hydrogen prices of two other supply methods, on-site electrolysis and tube-trailer transportation, and finds that they are relatively higher.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Guoping Hu, Qinghu Zhao, Lefu Tao, Penny Xiao, Paul A. Webley, Kevin Gang Li
Summary: In this study, a commercial activated carbon was used to separate methane from nitrogen with a 4-column vacuum swing adsorption facility, and it was found that pressure equalization and heavy product purge steps significantly impact separation performance. The recovery of low concentration methane gases will bring extra incentives with greenhouse gas mitigation benefits.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Wang Lu, Hongliang Huang, Zhu Hejin, Chang Yanjiao, Guo Xiangyu, Yang Fan, Chongli Zhong
Summary: In this study, a flexible Mn-bpdc MOF was used to efficiently separate C4H6 from C-4 hydrocarbons. The MOF demonstrated excellent adsorption selectivity and water stability, making it a promising method for C4H6 purification.
Article
Chemistry, Multidisciplinary
Jong Hyeak Choe, Hyojin Kim, Minjung Kang, Hongryeol Yun, Sun Young Kim, Su Min Lee, Chang Seop Hong
Summary: A facile and effective method for developing promising adsorbents with high CO2 adsorption capacity and long-term durability is demonstrated by fabricating diamine-appended Mg-2(dobpdc)-alumina beads coated with hydrophobic silanes and alkyl epoxides. The modified beads exhibit significant hydrophobicity, high CO2 uptake, and maintained CO2 capacity during repeated wet cycles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Engineering, Chemical
Valerio Loianno
Summary: The diffusion of carbon dioxide and other gases in a closed measuring system is investigated using FTIR Spectroscopy. The concentration evolution during diffusion is monitored with calibrated IR gas signals. The diffusion process is modeled as a two-bulb system and the mutual diffusivity is determined using Fick's law. The results agree with literature values and show a 9% deviation from the prediction of Chapman-Enskog theory when molecular interactions are modeled with the Lennard-Jones potential.
CHEMICAL ENGINEERING SCIENCE
(2023)
