Experimental study of nitrogen isotope separation by ion-exchange chromatography: effect of process factors

et al. 2023

Sci Rep

Self Cite

In this research work the thorium uptake on immobilized protonated orange peel was studied in a batch system. The effects of effective parameters such as biosorbent dosage, initial metal ion concentration, and contact time on the biosorption of thorium were analyzed. The biosorption capacity of the immobilized orange peel for thorium at optimal conditions of initial pH 3.8, biosorbent dosage 8 g/L, and initial thorium concentration 170 mg/L was found to be 18.65 mg/g. According to the results of contact time, the biosorption process reached equilibrium after around 10 h of contact. Investigation of the kinetics showed that the biosorption of thorium onto immobilized orange peel follows the pseudo-second-order model. The Langmuir and Freundlich isotherms were used to model the experimental equilibrium data. The results showed better agreement by the Langmuir isotherm. The maximum absorption capacity of immobilized protonated orange peel for thorium adsorption was predicted by the Langmuir isotherm at 29.58 mg/g.

Section: Investigation Of Kinetic Isotherm and Adsorption Efficacy Of...mentioning

confidence: 99%

Investigation of kinetic, isotherm and adsorption efficacy of thorium by orange peel immobilized on calcium alginate

Khamseh

Ghorbanian

et al. 2023

Sci Rep

Self Cite

“…Therefore, an integration between membrane separation processes with absorption can be the optimal process for CO 2 separation 27, 28. Also, the membrane process could be considered for the separation of stable isotopes 29–31.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of a Membrane Contactor for CO₂ Separation: Two Types of Membrane Evaluation

Alborzi¹,

Amirabedi³

et al. 2023

Chem Eng & Technol

Two different types of hollow‐fiber membrane contactors were used for CO2 separation from the gas stream with monoethanolamine (MEA) absorbent and numerically investigated. After the model validation with experimental data, CO2 removal efficiency, MEA concentration, and pressure drop variation were examined under different conditions by variation of some effective parameters such as gas stream velocity, absorption solution velocity, membrane porosity, and membrane tortuosity. Membrane tortuosity and porosity enhancement led to light decrease and light increase in CO2 removal efficiency, respectively, but gas stream velocity enhancement significantly reduced the CO2 removal efficiency.

“…Natural gas fields are the primary sources for helium extraction, and cryogenic distillation and pressure swing adsorption (PSA) are the main conventional processes in helium recovery and purification 7,8 . Membrane gas separation is another process that can recover and purify helium from natural gas in some stages.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of He/CH4 Separation by Hyflon AD60X Membrane

Chemical and Biochemical Engineering Quarterly

Ghaednian-Jahromi

Karimi-Sabet

et al. 2022

Self Cite

In this research, the membrane separation process was used to separate helium from methane gas. In order to do this, computational fluid dynamics (CFD) was used, and the effect of process parameters on the performance of the membrane separation process was studied by this method. To simulate the hydrodynamics of flow in the channel, the Navier-Stokes equation was used, and the Maxwell-Stefan equation was applied to simulate the mass transfer phenomenon. In addition, Fick's law was utilized to simulate mass transfer in the membrane domain. The impacts of significant parameters such as feed pressure, feed flow rate, and feed concentration on parameters such as He/CH 4 separation factor, methane and helium membrane flux and helium mole fraction in permeate stream were studied. The results of the simulation indicated that the feed pressure of 10 bar, feed flow rate of 120 cm 3 min -1 , and feed mole fraction of 0.0254 had the best membrane performance in He/CH 4 separation.