Numerical analysis of fixed bed adsorption kinetics using orthogonal collocation

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

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Selective recovery of rare earth elements with ligand-functionalized polymers in fixed-bed adsorption columns

Separation and Purification Technology ◽

10.1016/j.seppur.2021.118472 ◽

2021 ◽

Vol 265 ◽

pp. 118472

Author(s):

Jonathan C. Callura ◽

Qingyang Shi ◽

David A. Dzombak ◽

Athanasios K. Karamalidis

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Fixed Bed ◽

Functionalized Polymers ◽

Selective Recovery ◽

Fixed Bed Adsorption

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Fixed-bed adsorption of tannery wastewater pollutants using bottom ash: An optimized process

Surfaces and Interfaces ◽

10.1016/j.surfin.2020.100868 ◽

2021 ◽

Vol 22 ◽

pp. 100868

Author(s):

Ghita El mouhri ◽

Mohammed Merzouki ◽

Rabie Kachkoul ◽

Hajar Belhassan ◽

Youssef Miyah ◽

...

Keyword(s):

Fixed Bed ◽

Bottom Ash ◽

Tannery Wastewater ◽

Fixed Bed Adsorption ◽

Wastewater Pollutants

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Enhanced Reactor Performance with Pressure and Vacuum Swing Reaction

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1143 ◽

2004 ◽

Vol 2 (1) ◽

Cited By ~ 2

Author(s):

Vincent G Gomes

Keyword(s):

Method Of Lines ◽

Fixed Bed ◽

Downstream Processing ◽

Operating Conditions ◽

Reactor Performance ◽

Orthogonal Collocation ◽

The Method Of Lines ◽

Dynamic Experiments ◽

Product Separation ◽

Pressure Swing

Product separation and regeneration of sorbent was accomplished in a novel pressure swing reactor through pressurisation, adsorption, blowdown and purge steps. The switching from sorption to reaction to regeneration was tested in a two bed sorption/reaction apparatus. Models developed for the mass and momentum transfer in the catalyst bed and sorber, were solved using orthogonal collocation within the method of lines. The effects of operating conditions and cycle configurations on performance were assessed. The results from dynamic experiments with propene metathesis to produce ethene and 2-butene in a fixed-bed catalytic reactor were in agreement with model predictions. Both pressure and vacuum swing demonstrated that conversion and product quality can be enhanced by periodic cycling with greater separation obtained with vacuum swing. The separation of products help reduce the downstream processing costs of exit mixtures, enable reactant utilisation by recycling and improve product handling at subsequent stages. The efficacy of the periodic separating reactor in terms of conversion, product purity and recovery were investigated.

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