Zeolites as alcohol adsorbents from aqueous solutions

Abstract

The potential usage of zeolites as adsorbents for the removal of organic molecules from water was investigated in a series of experiments with aqueous solutions of lower alcohols. This could represent a simple solution to the problem of cleaning up industrial wastewater as well as recovering valuable chemicals at relatively low costs. Adsorption isotherms of the Langmuir type were applied, and calculations showed that the amount of propanol adsorbed on silicalite corresponded to approximately 70% of the pore volume. The adsorption process is simple, and recovery of the more concentrated products is easily done by heat treatment and/or at lowered pressures. Adsorption experiments with aqueous acetone showed that silicalite had approximately the same adsorption capacity for acetone as for n-propanol. Heats of adsorption were determined calorimetrically

Discovery of optimal zeolites for challenging separations and chemical transformations using predictive materials modeling

“…The difference between the initial and final concentration of ethanol and the total volume of the solution is used to determine the adsorbed ethanol amount, but the measurement is not sensitive enough to quantify the amount of water. 46 , and in MFI and FER, respectively, from the validation experiments carried out as part of this study. The predictions using the TraPPE-zeo/TraPPE-UA/TIP4P force fields are shown as green down and up triangles for MFI at T ¼ 298 and 323 K, respectively, and as cyan down and up triangles for FER at 298 and 323 K, respectively.…”

Sorption and pervaporation results of clinoptilolite filled poly(vinylalcohol) membrane prepared for dehydration of aqueous organic mixtures

“…molecular sieving effect). [43] The kinetic pore diameter of clinoptilolite (0.35 nm) allows easy adsorption and permeation of water (kinetic diameter of 0.3 nm), and also molecularly sieves the bigger solvent molecules such as ethylalcohol and EtAc (kinetic diameters are 0.43 and 0.52, respectively). [9,44] For this reason, the water selectivity of PVA-2 membrane is higher than that of PVA-1 membrane for all water concentrations.…”

Wetting properties of aqueous short-chain alcohols’ solutions

“…Adsorption of ethanol and 1-propanol on zeolites from 2% vol. solutions have been described in [12]. Selected results are presented in tab.…”

“…Adsorption of alcohols from 2% aqueous solutions on zeolites (100 mg zeolite/10 cm 3 solution). Based on[12].…”