Simulation of the Process of Biological Removal of Hydrogen Sulfide from Gas

Sulfur-oxidizing bacteria in environmental technology

“…This is also enhanced by abiotic oxidation, which leads to the formation of thiosulfates. Therefore, part of the absorbent liquid must be regenerated with NaOH (Elkanzi, 2009).…”

Conceptual design of a new SF6 abatement technology using a multi‐bed series reactor for the production of valuable chemicals free of toxic wastes

“…In addition, the Peng–Robinson fluid property package was opted as an appropriate equation of state and a steady‐state condition was assumed. Since thermodynamic properties of some components (SF 6 , SO 3 , CaO, CaF 2 , and CaSO 4 ) are not in the component library of Aspen HYSYS ® , hypothetical components were created using some important thermodynamic properties of each component like molecular weight, normal boiling point, and ideal liquid density . In particular, thermodynamic properties for the utilized adsorbent, CaO with molecular weight of 56.08 g mol −1 , normal boiling point of 3123 K, and ideal liquid density of 3,340 kg m −3 were used in this study.…”

“…Process simulation using Aspen HYSYS ® Commercial process simulators such as Aspen HYSYS ® (Aspen Technology, Inc., Bedford, MA, USA) [2,3,[42][43][44][45][46][47], Aspen Plus ® (Aspen Technology, Inc., Bedford, MA, USA) [48][49][50], UniSim ® Design Suite (Honeywell International Inc., Morris Plains, NJ, USA) [51,52], and CHEMCAD (Chemstations, Inc., Houston, TX, USA) [53,54] have been widely used to simulate the proposed processes of interest and obtain the useful process design guidelines and optimized conditions based on material and energy balances of the overall systems. Among them, Aspen HYSYS ® was chosen for this study as the most suitable process simulator for the proposed processes to simulate based on experimental data for SF 6 hydrolysis over alumina-based catalysts as presented in Figure 2.…”

Preliminary techno‐economic analysis of a multi‐bed series reactor as a simultaneous CF4 abatement and utilization process

“…To carry out parametric studies for various operating parameters in the system of interest, commercial process simulators such as UniSim ® Design Suite (Honeywelll, Morris Plains, NJ, USA), CHEMCAD (Chemstations, Inc., Houston, TX, USA), and Aspen HYSYS ® (Aspen Technology, Inc., Beford, MA, USA), have been widely used. These process simulators are based on material and energy balances of the system and optimum conditions for the system can be identified from the process simulation results providing a useful guideline for an efficient system design.…”

“…All process simulation works were performed with a steady‐state condition and Peng‐Robinson equation of state as an appropriate thermodynamic fluid package. Components such as CaO and CaF 2 were created as hypotheticals in the simulation based on their thermodynamic properties because these materials are not found in the component library of Aspen HYSYS ® . Figure shows a process flow diagram (PFD) of a single‐bed reactor (S‐1), a two‐bed series reactor (S‐2), and a three‐bed series reactor (S‐3) including conversion reactors modeled for CF 4 hydrolysis (Reaction 1) and HF conversion to CaF 2 (Reaction 2).…”