Study on calculating kinetic parameters of mathematical model describing the adsorption process of a single fixed bed of N2 gas generator working by pressure swing adsorption (PSA) and using carbon molecular sieves CMS-240

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Chinh Pham Van ◽  
Tuan Le Quang ◽  
Hieu Nguyen Tuan ◽  
Tien Vu Dinh
Keyword(s):  
Mathematical Model ◽  
Molecular Sieves ◽  
Pressure Swing Adsorption ◽  
Adsorption Process ◽  
Operating Conditions ◽  
Model Parameters ◽  
Gas Generator ◽  
Carbon Molecular Sieves ◽  
Adsorption Column ◽  
Pressure Swing

Nitrogen generator working by pressure swing adsorption cycle using carbon molecular sieves adsorbent is widely used in industry at small and medium scale in recent years, due to its convenience. This is equipment that uses a molecular size selective adsorption technique to separate nitrogen from air. In general, kinetic modeling and optimization are commonly used to analyze the process dynamics of the adsorption column at various operating conditions in which process parameters such as gas concentration, operating temperature and pressure are considered to be functions of time and bed height. In this paper, a mathematical model describing the adsorption column according to the pressure function is established following time and the height of the bed assuming that the velocity through area of the bed is constant at each pressure. The results of these calculations are model parameters that describe the adsorption process of the column. This model can be solved by MATLAB software to simulate the adsorption process of the column. This study was carried out on a nitrogen gas generator that was researched and designed at the Institute of Technology - General Department of Defense Industry to simulate, optimize and scale-up.

scholarly journals Study on calculating kinetic parameters of mathematical model describing the adsorption process of a single fixed bed of N2 gas generator working by pressure swing adsorption (PSA) and using carbon molecular sieves CMS-240

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Chinh Pham Van ◽  
Tuan Le Quang ◽  
Hieu Nguyen Tuan ◽  
Tien Vu Dinh
Keyword(s):  
Mathematical Model ◽  
Molecular Sieves ◽  
Pressure Swing Adsorption ◽  
Adsorption Process ◽  
Operating Conditions ◽  
Model Parameters ◽  
Gas Generator ◽  
Carbon Molecular Sieves ◽  
Adsorption Column ◽  
Pressure Swing

Nitrogen generator working by pressure swing adsorption cycle using carbon molecular sieves adsorbent is widely used in industry at small and medium scale in recent years, due to its convenience. This is equipment that uses a molecular size selective adsorption technique to separate nitrogen from air. In general, kinetic modeling and optimization are commonly used to analyze the process dynamics of the adsorption column at various operating conditions in which process parameters such as gas concentration, operating temperature and pressure are considered to be functions of time and bed height. In this paper, a mathematical model describing the adsorption column according to the pressure function is established following time and the height of the bed assuming that the velocity through area of the bed is constant at each pressure. The results of these calculations are model parameters that describe the adsorption process of the column. This model can be solved by MATLAB software to simulate the adsorption process of the column. This study was carried out on a nitrogen gas generator that was researched and designed at the Institute of Technology - General Department of Defense Industry to simulate, optimize and scale-up.

scholarly journals Simulation and Experimental Study of a Single Fixed-Bed Model of Nitrogen Gas Generator Working by Pressure Swing Adsorption

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 654 ◽  
Author(s):  
Pham Van Chinh ◽  
Nguyen Tuan Hieu ◽  
Vu Dinh Tien ◽  
Tan-Y Nguyen ◽  
Hoang Nam Nguyen ◽  
...  
Keyword(s):  
Molecular Sieves ◽  
Pressure Swing Adsorption ◽  
Selective Adsorption ◽  
Scale Up ◽  
Fixed Bed ◽  
Food Storage ◽  
Gas Generator ◽  
Nitrogen Gas ◽  
Institute Of Technology ◽  
Pressure Swing

Nitrogen is an inert gas available in the air and is widely used in industry and food storage technology. Commonly, it is separated by air refrigerant liquefaction and fractional distillation techniques based on different boiling temperatures of components in the mixed air. Currently, selective adsorption techniques by molecular sieve materials are studied and applied to separate gases based on their molecular size. In this paper, we simulate and investigate the effect parameters in a single fixed-bed model of a nitrogen gas generator using carbon molecular sieves, following pressure swing adsorption. This study aims to identify the effect of changing parameters so as to select the optimal working conditions of a single fixed-bed model, used as a basis for equipment optimization. This equipment was designed, manufactured, and installed at the Institute of Technology, General Department of Defense Industry, Vietnam to investigate, simulate, and optimize the industrial scale-up.

Application of Modified Carbon Molecular Sieves for Air Separation Based on Adsorption Kinetics

2014 ◽  
Vol 1015 ◽  
pp. 447-452
Author(s):  
Hong Li Sun ◽  
Hong Mei Wang ◽  
Shi Zhong Luo
Keyword(s):  
Molecular Sieves ◽  
Driving Force ◽  
Pressure Swing Adsorption ◽  
Textural Properties ◽  
Air Separation ◽  
Mixed Gas ◽  
Carbon Molecular Sieves ◽  
Desorption Isotherms ◽  
Pressure Swing ◽  
Adsorption Desorption

Several kinds of modified carbon molecular sieves (CMSs) were applied for air dynamic separation by pressure swing adsorption (PSA) at ambient temperature. The textural properties were characterized by N2 adsorption/desorption isotherms at 77 K. Linear driving force (LDF) model was used to fit the experimental data for the mixed gas. Results had shown that the modified CMSs with Cu2+ had the highest separation factor for air separation comparing to other samples.

scholarly journals Influence of the main operating parameters on the DRPSA process design based on the equilibrium theory

Adsorption ◽  
2020 ◽  
Author(s):  
Ester Rossi ◽  
Giuseppe Storti ◽  
Renato Rota
Keyword(s):  
Pressure Swing Adsorption ◽  
Degrees Of Freedom ◽  
Pressure Ratio ◽  
Complete Separation ◽  
Operating Conditions ◽  
Equilibrium Theory ◽  
Design Parameters ◽  
Reflux Ratio ◽  
Gaseous Mixtures ◽  
Pressure Swing

Abstract Among the adsorption-based separation processes for gaseous mixtures, those exploiting pressure variations, so-called Pressure Swing Adsorption (PSA) processes, are the most popular. In this work, we focus on the specific PSA configuration known as Dual Reflux-Pressure Swing Adsorption (DR-PSA) given its ability to achieve sharp separations. In the case of binary mixtures, an analytical approach based on Equilibrium Theory has been proposed to identify the operating conditions for complete separation under the assumption of linear isotherms. This same approach is not available when the separation is not complete. Accordingly, in this work we study the features of non-complete separations by solving numerically a general DR-PSA model with parameter values suitable to approach equilibrium conditions (no mass transport resistances, no axial mixing, isothermal conditions and no pressure drop), thus reproducing the analytical solution when complete separations are examined. Even for non-complete separations, triangularly shaped regions at constant purity can be identified on a plane whose axes correspond to suitable design parameters. Moreover, we found a general indication on how to select the lateral feed injection position to limit the loss in product purities when complete separation is not established, whatever is the composition of the feeding mixture. Finally, a sensitivity analysis with respect to pressure ratio, light reflux ratio and heavy product flowrate is proposed in order to assess how to recover product purities according to the specific degrees of freedom of a DR-PSA apparatus.

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