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Microporous and Mesoporous Molecular Sieves
Published in Rolando M.A. Roque-Malherbe, Adsorption and Diffusion in Nanoporous Materials, 2018
Pressure swing adsorption (PSA) is a cyclic process used to selectively adsorb and separate components of a feed gas mixture, thereby producing partially purified gas products. Since the first patent of a PSA process [198], a great variety of complicated PSA processes have been developed and commercialized, largely taking advantage of PSA’s low-energy requirement and low capital investment [199]. It is a very multipurpose technology for separation and purification of gas mixtures, which offers an additional level of thermodynamic freedom for describing the adsorption process in comparison with other standard separation methods, for example, distillation, extraction, or absorption [200].
Advanced Concepts in Membrane Contactors
Published in Anil K. Pabby, S. Ranil Wickramasinghe, Kamalesh K. Sirkar, Ana-Maria Sastre, Hollow Fiber Membrane Contactors, 2020
Using pressure swing adsorption (PSA) processes, it is a common industrial practice to produce a highly purified stream of the less adsorbed gas species, e.g., production of high purity H2 gas. In syngas purification processes to produce a purified H2 stream, one needs to simultaneously recover a purified CO2 stream for carbon sequestration. Recovering simultaneously a purified CO2 stream via PSA involves modification of the conventional PSA process operating cycle. For syngas purification, two conditions stand out, high pressure and higher temperature, conditions that are not generally encountered in conventional membrane contactor-based absorption processes suggesting the use of absorbents suitable for high temperatures. The PSMAB process recently developed responds to these needs [34,35]; a much simpler version was proposed many years back [36]. It uses microporous hydrophobic PEEK hollow fibers. The shell side of the hollow fiber module is filled with a nonvolatile absorbent which can withstand higher temperatures, e.g., ionic liquid, PEG 200/PEG 400. The CO2 solubility of the absorbent is drastically enhanced by having a nonvolatile amine in solution, e.g., polyamidoamine dendrimer Gen 0. The feed gas is introduced into the tube side of the hollow fibers. Figure 2.4a illustrates the process schematic using a single membrane contactor; Figure 2.4b illustrates the pressure and other conditions in the tube-side and other locations. The system studied used a 60–40 He–CO2 gas mixture with He acting as a surrogate for H2.
A comprehensive review on techno-environmental analysis of state-of-the-art production and storage of hydrogen energy: challenges and way forward
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Md Rasel Ahmed, Tirtha Barua, Barun K. Das
To maximize the effectiveness of the process, carbon monoxide is typically applied to catalyze the water-gas modification response, which increases hydrogen generation. In order to remove contaminants like CO and CO2 from the hydrogen production procedure, the pressure swing adsorption (PSA) technique is extensively used. To deliver the heat required for reforming, it is common practice to burn a part of the entering hydrocarbon feed together with waste gases containing H2 and CO (Ogden 2001). The main drawbacks are the dimensions and higher charge of plant components necessitated by the process’s temperature and pressure requirements (Angeli et al. 2014; Ball and Wietschel 2009b). Another drawback of SMR is that it has a negative environmental impact because it produces significant CO2 emissions (Kothari, Buddhi, and Sawhney 2008).
Benefits and barriers for the production and use of biomethane
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Antonio Carlos Franco, Luciane Silva Franco, Daniel Poletto Tesser, Rodrigo Salvador, Cassiano Moro Piekarski, Claudia Tania Picinin, Fabio Neves Puglieri
Pressure Swing Adsorption (PSA) is an energy efficient technology and delivers extremely pure products. It is an interesting technology for small capacities. During the regeneration step, the adsorbed species are removed by reducing the total pressure, therefore, there is no need for an increase in temperature. PSA shows benefits over other types of adsorption technologies because pressure changes faster than temperature, therefore, it enables rapid cycles and increases production per volume unit of adsorbent bed (Fernández-González et al. 2020; Styles, Dominguez, and Chadwick 2016).