An evaluation of mass-transfer coefficients for new and used ion-exchange resins

Lee, Gang-Choon; Foutch, Gary L.; Arunachalam, Alagappan

doi:10.1016/s1381-5148(97)00055-2

Cited by 15 publications

(9 citation statements)

References 17 publications

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“…One of the common assumptions is that mass transport into and out of the resin is controlled by the existence of a laminar dynamic layer of liquid adjacent to the surface of the resin bead, which for rough estimates will suffice. As it is extremely difficult to measure the concentration at the interface, it can for simplicity be assumed to be zero Lee et al as the minimal presence of adsorption ions on the resin—assuming equilibrium—translates to a zero concentration in the liquid adjacent to the resin. However, this implies that there would be no concentration gradient at the inner resin surface to provide a driving force for the diffusion of the ions into the resin polymer‐matrix, which makes no sense.…”

Section: Literature Reviewmentioning

confidence: 99%

A multiple mechanism model for measuring extra‐ and intraparticle mass transport in ion exchange resins

Nesbitt¹,

Petersen

2019

AIChE Journal

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A diffusion-based kinetic model for resin-based ion exchange is proposed that simultaneously describes extra-and intraparticle diffusion for the purpose of predicting batch transient adsorption rates during resin operation. The extraparticle diffusion is simulated through Newton's-law-of-cooling assuming a stagnant laminar layer, while the intraparticle simulation assumes a homogeneous internal pore environment and uses the Nernst-Planck equation to describe multi-ion diffusion. The key parameters of the model are the mass transfer coefficient, the intrinsic diffusivities of the adsorbing and desorbing ions and the equilibrium coefficient associated with the Mass-Action-Law, which is assumed to be applicable at the liquid/resin interface. A novel method is described to determine the critically important ion concentration at the interface from experiment. Kinetic tests are undertaken in a closed circuit system, adsorbing Na, Mg, and Ba ions separately onto gel type acid resin, and the simulation is fitted to the measured raw data using the Hook-Jeeves search algorithm. The intraparticle diffusivities of the three ions are hence measured and reported.

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Section: Literature Reviewmentioning

confidence: 99%

A multiple mechanism model for measuring extra‐ and intraparticle mass transport in ion exchange resins

Nesbitt¹,

Petersen

2019

AIChE Journal

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“…Chemical precipitation removes metals and other inorganic compounds, suspended solids, fats, oils, greases, and some other organic substances from water and wastewater through mechanisms such as coagulation, co-precipitation, and entrapment (Babel and Kurniawan 2003;Benatti et al 2009;Kun 2011;Lee et al 1997;Mohapatra et al 2005;US EPA 2002). Coagulants such as Fe 3?…”

Section: Precipitationmentioning

confidence: 99%

Bench-Scale and Pilot-Scale Treatment Technologies for the Removal of Total Dissolved Solids from Coal Mine Water: A Review

Pinto¹,

Al-Abed

Balz³

et al. 2015

Mine Water Environ

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Coal mine water (CMW) is typically treated to remove suspended solids, acidity, and soluble metals, but high concentrations of total dissolved solids (TDS) have been reported to impact the environment at several CMW discharge points. Consequently, various states have established TDS wastewater regulations and the US EPA has proposed a benchmark conductivity limit to reduce TDS impacts in streams near mining sites. Traditional CMW treatment effectively removes some TDS components, but is not effective in removing major salt ions due to their higher solubility. This paper describes the basic principles, effectiveness, advantages, and disadvantages of various TDS removal technologies (adsorption, bioremediation, capacitive deionization, desalination, distillation, electrochemical ion exchange, electrocoagulation, electrodialysis, ion exchange, membrane filtration, precipitation, and reverse osmosis) that have at least been tested in benchand pilot-scale experiments.

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“…When the exchange is slowed by fouling, factors like particle diffusion and exchange-site reaction need to be considered. 2 An overall mass-transfer coefficient includes all factors and represents the quality of the ion-exchange resin. 3 Resin fouling results in inefficient purification and reduced time until breakthrough.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Detailed theory of the MTC experiment is provided in the Supporting Information. Lee et al 2 used MTC as an indicator of resin fouling. They analyzed samples of different ages of resin from two coal-fired power plants in Oklahoma.…”

Section: ■ Introductionmentioning

confidence: 99%

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Mass-Transfer Coefficient as an Indicator of Resin Performance: Impacts of Film-Forming Amines and Storage Time on Condensate Polishing Ion-Exchange Resins

Hasan¹,

Rahman²,

Kabir³

et al. 2018

Ind. Eng. Chem. Res.

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Ion-exchange resins used in ultrapure water processing are known to lose effectiveness with fouling. Masstransfer coefficient (MTC) is one property that defines acceptable resin performance. MTC is measured by a simple column test with known feed concentration of ions at sufficient flow to achieve kinetic leakage out of bed. MTC deviation due to exposure to film-forming amines (FFAs), as well as impacts of resin storage time, are investigated. A filming amine (FA), octadecylamine (ODA), was evaluated experimentally for potential impacts on condensate polisher ion-exchange bead resins (Dowex MS 650C (H) and Dowex MS 550A (OH)). Results indicate significant reductions in MTC on both cationic and anionic resin. In addition, unused resin stored for excessive times, up to 16 years, showed MTC reduction.

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An evaluation of mass-transfer coefficients for new and used ion-exchange resins

Cited by 15 publications

References 17 publications

A multiple mechanism model for measuring extra‐ and intraparticle mass transport in ion exchange resins

A multiple mechanism model for measuring extra‐ and intraparticle mass transport in ion exchange resins

Bench-Scale and Pilot-Scale Treatment Technologies for the Removal of Total Dissolved Solids from Coal Mine Water: A Review

Mass-Transfer Coefficient as an Indicator of Resin Performance: Impacts of Film-Forming Amines and Storage Time on Condensate Polishing Ion-Exchange Resins

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