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4 Experimental program 35 4 Experimental program Pressure swing adsorption was also studied experimentally in order to validate the developed mathematical model, presented in Chapter 3. 4.1 Selected adsorbent The generation of nitrogen via PSA technique is performed by contacting the compressed air with a carbon molecular sieves (CMS) which is commonly manufactured by chemical vapour deposition (CVD) of hydrocarbons on highly microporous activated carbon precursor [94–96]. By means of this technology, micropore entrances become artificially narrowed by the superstructure of pyrolytic carbon, creating physical obstacles within the adsorbent pore system, so-called micropore-mouths [97]. Therefore, the pore system consists mainly of micropores (dpore < 2 nm) and ultramicropores (dpore 0.3 ÷ 0.7 nm) [98–100]. The internal structure of CMS adsorbent and general pore size distribution are presented in Fig. 4.1-1. The ultramicropores are mainly responsible for molecular sieving while the micropores provide negligible resistance to diffusion, but provide high capacity sorption sites for gas molecules [101]. Fig. 4.1-1 (a) internal structure of CMS; (b) general pore size distribution of CMS [99] In this work, Shirasagi MSC CT-350, taken from the lot M12OE1 and provided by CarboTech AC GmbH, is exploited. Standard specifications of the material are given in Tab. 4.1-1. A picture of the utilised adsorbent is shown in Fig. 4.1-2. Tab. 4.1-1 Specifications of Shirasagi MSC CT-350 [102,103] Parameter CAS number Colour Real density [g/mL] Ignition point [°C] Specification 7440-44-0 Black 2.0 ÷ 2.2 400 Raw material Coconut shells Appearance Cylindrical Particle diameter [mm] 1.8 ± 0.2 Bulk density [g/mL] 0.68 ÷ 0.73PDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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