Parametric Study of the Three-Bed Pressure−Vacuum Swing Adsorption Process for High Purity O2Generation from Ambient Air

2007 ◽  
Vol 46 (11) ◽  
pp. 3720-3728 ◽  
Author(s):  
Sang-Jin Lee ◽  
Jin-Hwan Jung ◽  
Jong-Ho Moon ◽  
Jeong-Geun Jee ◽  
Chang-Ha Lee
Keyword(s):  
High Purity ◽  
Parametric Study ◽  
Adsorption Process ◽  
Ambient Air ◽  
Vacuum Swing Adsorption

scholarly journals Analysis of direct capture of $${\hbox {CO}}_{2}$$ from ambient air via steam-assisted temperature–vacuum swing adsorption

Adsorption ◽  
2020 ◽  
Vol 26 (7) ◽  
pp. 1183-1197 ◽  
Author(s):  
Valentina Stampi-Bombelli ◽  
Mijndert van der Spek ◽  
Marco Mazzotti
Keyword(s):  
Parametric Study ◽  
Co Adsorption ◽  
Electrical Energy ◽  
Ambient Air ◽  
Operating Conditions ◽  
Desorption Kinetics ◽  
Desorption Time ◽  
Vacuum Swing Adsorption ◽  
Air Capture ◽  
Energy Consumptions

Abstract In this work, direct air capture (DAC) via adsorption is studied through the design and analysis of two temperature–vacuum swing adsorption (TVSA) cycles. In the first part, a novel way of describing the adsorption of $${\hbox {CO}}_{2}$$ CO 2 in presence of water vapor is proposed for co-adsorption kinetic and thermodynamic data gathered from the literature. Secondly, two TVSA cycle designs are proposed: one with a desorption step via external heating, and one with a steam purge. A schematic method for the determination of the cycle step times is proposed and a parametric study on the operating conditions is performed via cycle simulations using a detailed, first principles model. Finally, the two cycles are compared in terms of $${\hbox {CO}}_{2}$$ CO 2 production and energy consumption. The parametric study on the desorption time shows that there is a desorption time yielding the highest $${\hbox {CO}}_{2}$$ CO 2 production at low energy consumptions. Low evacuation pressures are necessary to reach high $${\hbox {CO}}_{2}$$ CO 2 production, but higher evacuation pressures show to be always favorable in terms of specific electrical energy requirements. A steam purge requires an additional thermal energy cost, but it not only allows decreasing the specific electrical energy consumptions, it also enhances $${\hbox {CO}}_{2}$$ CO 2 desorption kinetics and allows reaching higher $${\hbox {CO}}_{2}$$ CO 2 productions at milder evacuation pressures. The results of this work present the possibility to directly relate the availability of power and heat to the design of the cycle.

scholarly journals High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 609
Author(s):  
Majeda Khraisheh ◽  
Fares AlMomani ◽  
Gavin Walker
Keyword(s):  
High Purity ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Raw Material ◽  
Strong Interactions ◽  
Step Cycle ◽  
Experimental Conditions ◽  
High Purity Grade ◽  
Trade Off ◽  
Vacuum Swing Adsorption

Propylene is one of the world’s most important basic olefin raw material used in the production of a vast array of polymers and other chemicals. The need for high purity grade of propylene is essential and traditionally achieved by the very energy-intensive cryogenic separation. In this study, a pillared inorganic anion SIF62− was used as a highly selective C3H4 due to the square grid pyrazine-based structure. Single gas adsorption revealed a very high C3H4 uptake value (3.32, 3.12, 2.97 and 2.43 mmol·g−1 at 300, 320, 340 and 360 K, respectively). The values for propylene for the same temperatures were 2.73, 2.64, 2.31 and 1.84 mmol·g−1, respectively. Experimental results were obtained for the two gases fitted using Langmuir and Toth models. The former had a varied degree of representation of the system with a better presentation of the adsorption of the propylene compared to the propyne system. The Toth model regression offered a better fit of the experimental data over the entire range of pressures. The representation and fitting of the models are important to estimate the energy in the form of the isosteric heats of adsorption (Qst), which were found to be 45 and 30 kJ·Kmol−1 for propyne and propylene, respectively. A Higher Qst value reveals strong interactions between the solid and the gas. The dynamic breakthrough for binary mixtures of C3H4/C3H6 (30:70 v/v)) were established. Heavier propylene molecules were eluted first from the column compared to the lighter propyne. Vacuum swing adsorption was best suited for the application of strongly bound materials in adsorbents. A six-step cycle was used for the recovery of high purity C3H4 and C3H6. The VSA system was tested with respect to changing blowdown time and purge time as well as energy requirements. It was found that the increase in purge time had an appositive effect on C3H6 recovery but reduced productivity and recovery. Accordingly, under the experimental conditions used in this study for VSA, the purge time of 600 s was considered a suitable trade-off time for purging. Recovery up to 99%, purity of 98.5% were achieved at a purge time of 600 s. Maximum achieved purity and recovery were 97.4% and 98.5% at 100 s blowdown time. Energy and power consumption varied between 63–70 kWh/ton at the range of purge and blowdown time used. The VSA offers a trade-off and cost-effective technology for the recovery and separation of olefins and paraffin at low pressure and high purity.

Fractionated Vacuum Swing Adsorption Process for Air Separation

1993 ◽  
Vol 28 (17-18) ◽  
pp. 2553-2565 ◽  
Author(s):  
S. Sircarm ◽  
B. F. Hanley
Keyword(s):  
Adsorption Process ◽  
Air Separation ◽  
Vacuum Swing Adsorption
Sign in / Sign up

Export Citation Format

Share Document