Removal of heat stable salts from industrial lean methyldiethanolamine using magnetic alginate/iron oxide hydrogel composite. (April 2019)

• Record Type: Journal Article
• Authors: Edathil, Anjali Achazhiyath; Alhseinat, Emad; Banat, Fawzi
• Is Part Of: International journal of greenhouse gas control. Volume 83(2019)
• Page Start: 117
• Page End: 127
• Publication Date: 2019-04
• Subjects: Heat stable salts -- Organic acids -- Magnetic alginate -- Adsorption -- Methyldiethanolamine; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2019.02.005
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: A new process for the removal of HSS from amine solvent is presented. Magnetic calcium alginate hydrogel composites was prepared and used for HSS removal. Pseudo-second order kinetics very well correlated with the experimental data. Magnetic alginate–Fe2 O3 hydrogel composites showed high performance stability after three absorption cycles. Magnetic alginate–Fe2 O3 hydrogel composites is presented as a simple and cost-effective adsorbent for the successful reclamation of industrial lean MDEA. Abstract: Heat Stable Salts (HSS) are undesirable contaminates that are generated due to the degradation of the amine solvent. This study deals with the development of a new process for the removal of HSS from amine solvent using magnetic calcium alginate hydrogel composites. The magnetic calcium alginate hydrogel composites was prepared by encapsulating freshly prepared maghemite nanoparticles (γ-Fe2 O3 ) synthesized using a conventional precipitation technique in the calcium alginate beads. The developed magnetic hydrogel composites (CA-Fe2 O3 ) characterized by XRD, SEM and FTIR showed that γ-Fe2 O3 are retained homogeneously in the composites matrix. Kinetic and equilibrium batch adsorption experiments revealed that maximum HSS removal of 29.24% was achieved in 240 min with 3.0 g of onto CA-Fe2 O3 composites at 25 °C and sorption efficiency increased with an increase in temperature. Adsorption kinetic study was performed using three kinetic models and the pseudo-second order kinetics very well correlated with the experimental data; demonstrating the chemisorption and endothermic nature of sorption. The reusability experiments showed no significant loss in absorption capability even after eight cycles. Additionally, the superparamagnetic behavior showcased by the magnetic composites allowed easy separation of the composites from lean MDEA using an external magnet. Therefore, such magnetic alginate–Fe2 O3 hydrogel composites can work as a simple and cost-effective adsorbent for the reclamation of industrial lean MDEA, with the additional advantages of good efficiency, eco-friendliness and being easy to fabricate and recover.