PDF Publication Title:
Text from PDF Page: 023
2 Contextualization and state of art Several separation processes could be employed for gas separation, such as extraction, distillation and adsorption. Although distillation is simpler, the costs associated with energy became a problem that worked as a driving force to more research in adsorption [6]. The adsorption processes, mostly Pressure Swing Adsorption (PSA), are the most commonly used for this purpose due to its characteristics for the separation of gases mixtures [2]. 2.1 Pressure Swing Adsorption and its Milestones Although the establishment of PSA processes is frequently attributed to Skarstrom and Guerin de Montgareuil and Domme in 1957-1958, several of the crucial aspects of this process were established earlier in the work of Kahle. In the patent dated from 1953, Kahle states an adsorption process for the separation and purification of gas mixtures. A process composed by two adsorbent columns is described with the purposes of improvement of the process and particularly, accomplish a more economical consumption of the quantities of heat and cold employed [7]. Later, in 1957, Skarstrom presents a process for the drying of the air, or other gases materials, without the need of external heat to regenerate the adsorbent, which reduces the requirement for adsorbent material and provides equipment that allows the production of effluent streams rich, in at least, one component. The process was composed by two adsorbing beds [8]. Pressure Swing Adsorption systems were the first technology created using the Skarstrom’s cycle [9]. Some of the milestones as well as relevant papers and patents of Pressure Swing Adsorption evolution are gathered in Appendix 1. 2.2 Adsorption Adsorption is based on the interaction that occurs between gas molecules when nearby a solid surface, resulting in a reduction in potential energy. In order to maintain the molecular density in the surroundings of the surface greater than in the free-gas phase, the molecules tend to concentrate in the solid region. The attributes of the solid and sorbate are very crucial in determining the strength of the surface forces. If the interactions between gas and solid are weak, involving only van der Waals forces the phenomena described will be physical adsorption. Different molecules will interact differently with the surface, and, the nature of the surface involved will also affect the nature of the interaction. These factors define the “selectivity” of the process which is the substance for adsorption separation processes. Due to the small capacities attainable in the chemisorption processes, most feasible adsorption processes, including PSA, rely on physical adsorption. The behaviour of a PSA process is highly determined by equilibrium and kinetic aspects, however, the relative significance of each of Contextualization and state of art 3 Pressure Swing Adsorption for Hydrogen PurificationPDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
PDF Search Title:
PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGENOriginal File Name Searched:
32541.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)