Single- and Dual-Stage High-Purity Oxygen Production Using Silver-Exchanged Titanosilicates (Ag-ETS-10)

Abstract

High-purity (>99.5%) O2 production from air with silver-exchanged titanosilicates (Ag-ETS-10) using multiple single- and dual-stage vacuum swing adsorption (VSA) cycle configurations was investigated through process simulation, and optimization. Model predictions for the Skarstrom cycle were validated through experiments and an O2 purity of 98.3 ± 0.5% with a corresponding recovery of 10.6% was achieved. Oxygen purity-recovery Pareto fronts for the Skarstrom cycle and 6-step cycle with pressure equalization (PE) and heavy product pressurization (HPP) with dry air as the feed were obtained. The optimization predicted 82.0% O2 recovery with a product purity of 99.5% for a 6-step cycle with PE and HPP and dry air feed stream. The effect of nitrogen content in the feed on the performance indicators was also studied. Operating conditions for various cycle configurations were optimized through nondominated sorting genetic algorithm technique to achieve low total energy consumption (592.4 kWh/tonne O2) and high overall productivity (1.30 tonne O2/m3 Ag-ETS-10 day). The Pareto fronts of the single- and dual-stage configurations were compared against each other in order to choose the best possible design. The results indicated that the single-stage 6-step cycle with PE and HPP presents a better performance compared to the other single- and dual-stage approaches. A simple graphical scheduling study was also conducted in order to calculate the number of columns required for a continuous process using the better performing configurations.

Analysis of a Batch Adsorber Analogue for Rapid Screening of Adsorbents for Postcombustion CO2 Capture

“…The set of partial differential equations are discretized spatially using a finite volume technique, and the resulting ODEs are solved using an inbuilt MATLAB ODE solver. The detailed model has been validated against lab-scale and pilot-scale experimental results.…”

Process Optimization-Based Screening of Zeolites for Post-Combustion CO2 Capture by Vacuum Swing Adsorption

“…The stiff partial differential equations of the detailed model along with suitable boundary conditions are solved in MATLAB using the finite volume approach, and the details can be found elsewhere. 24 The detailed model 24 used in this study has been validated on both the lab 27 and pilot scale 25 for CO 2 capture and other separations. The detailed model requires several other parameters, e.g., mass transfer and heat transfer parameters.…”

Oxygen separation diffusion-bubbling membranes

“…Oxygen is widely used in energy, medicine, chemical and other industries. [1][2][3][4][5][6][7][8][9][10] There are state-of-the-art technologies to separate oxygen from the air: cryogenic distillation, adsorption, and membrane separation. [11][12][13][14][15][16][17][18][19] Cryogenic distillation is commonly used for large-scale oxygen production (99% oxygen purity).…”