Improvements in acetone adsorption efficiency

Abstract

Industrial process solvents are recovered by a variety of unit operations. Solvents in an air stream at low concentrations (10-30% LEL) are usually recovered via fixed carbon bed adsorption [I-31. In fixed bed operations, after a carbon bed has adsorbed a working charge of solvent, the solvent is removed and collected so that the carbon can be reused. Multiple adsorbers are used in parallel to facilitate the regeneration process since a regenerating carbon bed is isolated from the solvent laden air (SLA).Adsorbed solvent is usually removed from a carbon bed by using a steam purge to raise the temperature of the bed. As the temperature increases, the solvent load on the carhon decreases, and the desorbed solvent is carried out of the carbon bed by uncondensed steam. After the working 12. J ; l c o l r , t ' . ; r n d D. Tondetir, "N(~nis(1tlrer1n~11 G a s Adsorption i n Fixed R e d s , I . A. Simplistic Linearized E <~~i i l i l >~-i u n i M~, c l e l , " Clwni. Etigr-. J 22, 1x7-202 (l9Xl). Liai>is, A. I. hncl 0. K. Crosber, " C o n i p a i -i h o n c,t'Model Prediction, with N~~~l i~~) t l l~~r~~l~l l Sorptic,n Dkda ti,,-Eth~ule-C;,rl,,,,, Dioxide Mixtiires in I3ecls of 5 A Molect~lal-Sieves," Chr,ti. E n g r . S c i . :37, 958-961 [ 1982).

Equilibrium and Heat of Adsorption for Water Vapor and Activated Carbon

“…Owing to this unique sigmoidal behavior caused by the primary and secondary adsorption sites, only a few adsorption isotherm models can be used to describe the adsorption of water vapor onto activated carbon. Models describing the equilibrium uptake of water vapor by activated carbon developed by Kisarov (1984), Mastroianni and Rochelle (1985), Dubinin and Serpinsky (1981), Barton et al (1991), and Doong and Yang (1987) were reviewed by Huggahalli and Fair (1996). The review provides an overview of each model and describes why the Doong and Wang (DY) model is the most appropriate model available to describe the equilibrium uptake of water vapor by activated carbon.…”

Steam Regeneration of Adsorbents: An Experimental and Technical Review

“…Drying of bed is important as moisture left un-removed in bed can drastically affect the adsorption capacity and other operational performances 39,18 . Drying ensure that leftover removable moisture as well as adsorbate is removed in order to bring bed back to identical defined starting condition as much as possible 20 .…”

Modeling Bisolute Adsorption of Aromatic Compounds Based on Adsorbed Solution Theories

“…Since the early 1980s, chemical engineers have begun to incorporate nonideality into IAST by developing different versions of Adsorbed Solution Theories (ASTs) such as RAST (Real Adsorbed Solution Theory) . ASTs have been successfully used to model adsorption of a number of multicomponent mixtures from the gas phase − and have recently been extended to adsorption from the solution phase but only with limited success for a small number of OCs under selected conditions. − Compared to IAST that has been widely accepted by environmental engineers, , surprisingly, other ASTs are largely unknown to the environmental community. , Even among chemical engineers, the focus has been on multicomponent adsorption from the gas phase. − More importantly, the existing models are mostly fitting models with predictive ability confined to a few well-defined solution conditions; − it remains challenging to have a reliable prediction of multisolute adsorption equilibrium for a diverse range of OC mixtures . Therefore, it is imperative to establish AST-based predictive models that will allow accurate estimation of multisolute adsorption equilibrium of various OCs by common adsorbents.…”

“…44−46 Compared to IAST that has been widely accepted by environmental engineers, 15,26 surprisingly, other ASTs are largely unknown to the environmental community. 47,48 Even among chemical engineers, the focus has been on multicomponent adsorption from the gas phase. 39−43 More importantly, the existing models are mostly fitting models with predictive ability confined to a few welldefined solution conditions; 49−53 it remains challenging to have a reliable prediction of multisolute adsorption equilibrium for a diverse range of OC mixtures.…”