Studies on Dynamic Adsorption Behaviour of Ethyl Acetate from Air on 5A and 13X Molecular Sieves

Abstract

On a obtenu des données expérimentales pour l'adsorption de l'acétate d'éthyle présent dans l'air à l'aide de tamis moléculaires 5A et 13X, en faisant varier la concentration d'adsorbat et la vitesse d'entrée ainsi que le rapport entre le diamètre et la longueur de lit, afi n d'étudier leurs effets sur la performance du lit adsorbeur. Un modèle mathématique reposant sur l'approximation de la force motrice linéaire est validé avec les données expérimentales et simulé pour comprendre les effets d'autres paramètres pertinents tels que le coeffi cient de transfert de matière global, la capacité de saturation et le coeffi cient de transfert de chaleur entre le lit et la paroi. Le tamis moléculaire 13X d'une capacité supérieure à celle du 5A se montre plus près du comportement d'adsorption idéal. Le taux de transfert de matière est contrôlé par la diffusion dans les pores.

Adsorption of butyl acetate in air over silver-loaded Y and ZSM-5 zeolites: Experimental and modelling studies

“…The model developed in the present study reasonably predicted the VOC concentration. The best fit was verified by root mean square error (ı) range from 0.02 to 0.07 [24]. It was observed that the equilibrium adsorption constant, K decreased drastically with the increase in temperature.…”

“…The column was divided into N equal increments ( z = 1/n) and the convergence was studied by increasing the value of n. The calculated breakthrough curves converge when n was greater than 35. The simulation was carried out until n equal to 200 to ensure that there was no error due to numerical resolution of the system [24]. The main purpose of the approach developed in this work is that the parameters appearing in the model can be easily estimated from the correlations.…”

Competition among Mixed Adsorbates Affecting the Adsorption of Gaseous Methyl Ethyl Ketone by Hydrophobic Molecular Sieve

“…Gaseous VOC breakthrough tests for molecular sieve adsorption have frequently been utilized to evaluate the equilibrium adsorption capacity (Q e , g VOC/g MS) (Yoo, et al, 2005;Lin, et al, 2005;Manjare and Ghoshal, 2005). Breakthrough tests of MEK adsorption (C = 1448 (1471 ± 319) and 440 (483 ± 183) ppm) were performed herein to verify the feasibility of the simulated equilibrium capacity data in Table 3.…”

Optimization of air-borne butyl acetate adsorption on dual-function Ag–Y adsorbent-catalyst using response surface methodology

“…This indicates the overall drop in the adsorption rate at higher flow rate [4,13]. A more detailed analysis has revealed that the heat of adsorption varies strongly with VOC concentration range [12]. However, vent streams with high VOC concentration can be diluted with air or inert gases.…”

“…Due to their unique pore system and high surface area, these materials are actively investigated for adsorption of organics from air/gas [10,11]. More hydrophobic zeolites (usually those with high Si/Al ratios) are receiving attention due to their relatively high thermal stability while showing higher affinity towards VOC adsorption in humid conditions [4,9,12].…”