The issue of adsorption capacity
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Is there anyone who can talk about the dynamic adsorption capacities of different adsorbents for common components such as CO2, CO, and CH4 in pressure swing adsorption, and what are the corresponding values of these components at different pressures? This post was last edited by lsx-tzq on 2007-12-13 00:25.]
By conducting some experiments in the laboratory, it can be determined that, under normal circumstances, the adsorption properties of various adsorbents produced by different manufacturers are not exactly the same; there are certain differences. Moreover, even within the same manufacturer, the properties of each batch of adsorbents vary as well. The adsorption properties of the adsorbents used in pressure swing adsorption differ to some extent from the data obtained in the laboratory, and such data can only be used as a reference.
So, for those on the second floor, what do you use as a basis for calculations when doing design work? What are the data points used as references? This post was last edited by lsx-tzq on 2007-12-14 00:31
By combining the engineering data with the laboratory data and then applying a certain coefficient, it can be determined
May I ask the original poster: once you have the experimental data on pressure swing adsorption, if you want to move to an industrial scale, do you need to conduct simulations first as part of the design process? If necessary, what is used to simulate it? :)
I would like to ask what types of adsorbents everyone has chosen. Is the adsorption of these gases by the catalysts the same as well? I’ll go and study nickel-based catalysts!
Water adsorption data, CO2 adsorption data – you can use those required by the manufacturer. Note that there are static adsorption data and dynamic adsorption data. Don’t get it mixed up. The CO adsorption data cannot be provided by the manufacturer either. You can look up literature. Generally speaking, the adsorption of CO in 5A and 13X molecular sieves is about 40% lower than that of CO2. As for CH4, its adsorption amount on molecular sieves is very small; at 25 degrees Celsius and a CH4 partial pressure of 760 millimeters of mercury, the adsorption capacity of molecular sieves for methane is approximately 1% on a weight basis, and it can be considered negligible at lower partial pressures. ) Note 1: The CO2 static adsorption data provided by manufacturers were obtained under conditions of 25 degrees and 250 mmHg; you can use this to compare the CO2 adsorption capacities of different types of molecular sieves from various manufacturers. As for the testing methods for dynamic CO2, they vary among different molecular sieve manufacturers, so it is not possible to directly compare the data from various manufacturers. Note 2: The static water adsorption data provided by manufacturers is also at 25 degrees, but the water vapor pressures vary; some manufacturers use 10 millimeters of mercury, while others use 17.5 millimeters of mercury. ( corresponding to 50% RH and 80% RH at 25 degrees ) Last edited by maogenfu on 2007-12-25 19:39 ]
Once you have the experimental data on pressure swing adsorption, if you want to move to industrial application, you need to conduct design work first – do you need simulations for that? If necessary, what is used to simulate it? :)