Development of a mathematical model of molecular-selective gas transfer in a hybrid membrane-adsorption oxygen concentrator

Tishin, A. A.; Gurkin, V. N.

doi:10.1088/1742-6596/1368/4/042043

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Air is separated into its constituents using three basic technologies [4]: adsorption, membranes, and cryogenic separation. The usefulness of each of these technologies is frequently determined by the volume of separation products required [5][6]. When it is important to create high purity oxygen, the adsorption separation method [7] is used.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Nitrogen from Air to Produce Oxygen

ICC

ali²,

almilly³

et al. 2023

Egypt. J. Chem.

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In our current life, a severe challenge is faced with a lack of synthetic oxygen because of infection with the Coronavirus. Oxygen can be supplied by using selective adsorption of nitrogen from the air using Pressure-Vacuum Swing Adsorption (PVSA). The experimental layout consists of one column (inner diameter 4 cm) packed with commercial Li⁺ cation loaded on the zeolite low silica type x (Li-LSX zeolite), the particle size of zeolite is 0.4-0.8 mm of 9 cm in height. The effects of inlet air pressure 0.5-2.5 bar and inlet air flow rate 2-10 L min -1 on outlet oxygen purity and recovery were studied. Also, the isotherm behavior was studied to determine the type of adsorption. The results showed that increasing inlet pressure and flow rate increased the amount of adsorbed nitrogen, i.e., increased oxygen purity in the outlet. The effect of pressure tended to reduce the adsorption over a certain limit 2.5 bar due to forcing gas molecules to enter the sites on the zeolite particles' surfaces. Optimization was oobserved (73.14 % purity, 2.4496 recovery, and 153.471 mmolKg -1 s -1 ) with productivity of oxygen at 2.5 bar and 8 L min -1 . Also, the adsorption isotherm and breakthrough curve were studied.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Nitrogen from Air to Produce Oxygen

ICC

ali²,

almilly³

et al. 2023

Egypt. J. Chem.

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“…e adsorption separation method is used to produce oxygen that is very pure [7]. Based on this, many pieces of medical oxygen equipment have been made [2].…”

Section: Introductionmentioning

confidence: 99%

Methodological Approach for Optimizing Production of Oxygen by Adsorption of Nitrogen from Air using Zeolite Li-LSX

Al-Yousuf

Almilly

Kamil

2022

International Journal of Chemical Engineering

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This research investigates the optimum operating conditions related to the adsorption of nitrogen gas from ambient air on zeolite Li-LSX to produce oxygen gas by the pressure-vacuum swing adsorption process. Experiments were performed using a column (4 cm inside diameter and 17 cm length) packed with different heights of packing (h) of zeolite (9, 12, and 16 cm) from 0.4 to 0.8 mm diameter pellets. At each packing height, different flow rates (f) (2, 4, 6, 8, and 10 L·min−1) for different input pressures ( p ) (0.5, 1, 1.5, 2, and 2.5 bar) were used to detect their effects on the purity of produced oxygen as percentage volume of the outlet air stream. The results showed that the purity of produced oxygen increased with increasing packing height, pressure, and flowrate to a specific limit. The maximum purity obtained was 73.15% at 16 cm packing height, 2.5 bar input pressure, and 6 L·min−1 inlet flowrate, and the productivity was equal to 18 mmol·(Kg·s)−1 at these conditions. A response surface methodology was used to determine the most influential variables and their interactions. The results confirmed the strong effects of the input pressure, the packing height, and to a lesser extent, the flowrate. A quadratic model was predicted based on the experimental result and assessed statistically. The impacts of quadratic terms in the model were in the order: of p ∗ p > p ∗ h > p ∗ f . The model was applied to predict the operating conditions of 95% purity of oxygen.

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Study of sorption properties of HF 512O and NaX synthetic zeolites in the process of sorption of air mixture components

Tishin

2020

J. Phys.: Conf. Ser.

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The sorption properties of synthetic zeolites HF 512O and NaX were studied. In the course of the study, the volume method obtained the sorption capacities of zeolites for nitrogen and oxygen. The experimental setup for determining the sorption capacity by volumetric method consisted of two tanks. The first tank has a known volume, and the second tank is filled with the studied sorbent. Helium was used to determine the free volume of the second tank. The gas sorption capacity of which must be determined is fed to the first tank, the second tank is pumped out using a vacuum pump, after which the tanks are connected and the separation in the tanks is leveled. Thus, the sorption capacity of the sorbent can be calculated based on the pressure drop in the system. The selectivity of sorbents for the nitrogen – oxygen pair for pure gases was calculated.

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Development of a mathematical model of molecular-selective gas transfer in a hybrid membrane-adsorption oxygen concentrator

Cited by 4 publications

References 5 publications

Adsorption of Nitrogen from Air to Produce Oxygen

Adsorption of Nitrogen from Air to Produce Oxygen

Methodological Approach for Optimizing Production of Oxygen by Adsorption of Nitrogen from Air using Zeolite Li-LSX

Study of sorption properties of HF 512O and NaX synthetic zeolites in the process of sorption of air mixture components

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