Volume‐Gravimetric Measurements of Binary Gas Adsorption Equilibria

Abstract

Adsorption equilibria of binary gas mixtures on rigid solid adsorbents like activated carbons (AC) and molecular sieves (MS) can be measured “on line” by combining the (well known) gravimetric and the volumetric method. The resulting volume‐gravimetric method is described. Also the basic equations necessary to calculate the masses of each of the two adsorbed components are formulated. Explicit solutions for binary ideal gas adsorptives are given. The experimental device used for measurement is outlined. Data for coadsorption equilibria of a N2/CH4 mixture on activated carbon AK WS IV‐G 20575 at T = 298 K in the pressure range 1–20 bar are reported and discussed to a certain extend.

Adsorption Measurement of Water/Ethanol Mixtures on Activated Carbon Fiber

“…A simple method to measure the adsorption equilibria of binary gas or vapor mixtures (with nonisometric components) is the combined gravimetric-volumetric method which was applied and further developed by Keller and co-workers [5,6]. By combining the well-known methods gravimetry and volumetry the gas mixture concentration measurement (by GC or mass spectrometer) which is usually necessary, is no longer required.…”

“…By combining both measuring effects (mass increase measured with magnetic suspension balance and pressure drop from the volumetric measurement) the co-adsorption equilibria of binary gas or vapor mixtures can be measured without performing a concentration measurement of the adsorptive or adsorbate. Details of the gravimetric-volumetric method are given in [5] and [8].…”

“…The measurement technology is based on fundamental work by Keller et al [5] dealing with a combined gravimetric and volumetric method. The new experimental installation has been tested by measuring the adsorption equilibria of water and ethanol vapor as well as two mixtures of these components on a microporous activated carbon fiber (ACF).…”

Development of Automatic Adsorption Apparatus for Binary Mixture: Measurement of Individual Adsorption Isotherms of Ethanol and Water from Their Mixed Vapors by Active Carbon Fiber

“…1), and T is the temperature of an air circulation bath of the (V s1 + V s2 ) region. Thus, it is possible to determine the four adsorption parameters (n 1 , n 2 , P 1 , P 2 ) for a binary mixed vapor by a combination of volumetry and gravimetry (3)(4)(5).…”

Messung von Wasser/Ethanol-Gemischisothermen an Aktivkohlefaser

“…Daher wurde aufbauend auf grundlegenden Arbeiten u È ber das kombinierte gravimetrisch-volumetrische Verfahren zur Messung der Adsorption von bina È ren Gemischen [5] ein kommerzielles, automatisiertes Messgera È t entwickelt. Dieses Gera È t wurde an Hand der Messung der Adsorption von Wasser-und Ethanoldampf sowie von zwei Gemischen dieser Stoffe an einer mikroporo È sen Aktivkohlefaser getestet.…”