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Mohamed S.A. Baksh et al. (2013) patented a process for Praxair using 6 adsorbing beds. The process could be executed with 6 beds and 18 steps or in turndown mode with 5 beds and 15 steps. The turndown mode allows operating the process with some of the beds in an off mode if the needs of the process vary. Beds are composed by 5 layers of adsorbent: one layer of alumina to adsorb the moisture contained in the feed, two layers of activated carbon with different diameters where the carbon dioxide and methane are adsorbed and two layers of zeolite also with different diameters to remove the carbon monoxide, nitrogen and the residual methane. Despite the different length of each layer of activated carbon and zeolite, also the particle sizes vary in order that each layer of each adsorbent adsorbs preferentially one specific component due to the fact that the particle’s size affects the rate of adsorption and desorption. While the first layer of activated carbon particles must have sizes between 1.0 and 2.0 mm in order to adsorb the methane the second layer consists in particles with a size range of 0.5-1.5 mm so that this layer is responsible for adsorbing the carbon dioxide. In the first layer of zeolite the particle’s size range must be between 0.5-2.0 mm in order to adsorb carbon monoxide while the second layer of zeolite has a particle size range between 2 and 3 mm considering that there are no diffusional limitations in respect to the N2. This process aims at purities of 99.999% whether using 5 or 6 beds and recoveries of 88% for 6 beds process and 85.5% for 5 beds process. If instead of using one adsorption step two simultaneous adsorption steps are employed the total bed size factor decreases, maintaining the recovery of 85% and purity of 99.999% [29]. Pressure Swing Adsorption for Hydrogen Purification Contextualization and state of art 10PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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