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Gas mixture adsorption

The separation of micropore and mesopores plus the outer surface area was done by the combination of elution and flash thermodesorption [9]. With the latter it is possible to determine the contribution of the micropores to sorption separately as micropore desorption requires a higher activation energy because of the above mentioned effects. After injection of an organic vapour or a selection of a particular concentration of the gas mixture, adsorption took place on the sample in the column. The following carrier gas eluted the adsorbate and the peak was recorded. [Pg.634]

J. U. Keller, F. Dreisbach, H. Rave, R. Staudt, M. Tomalla Measurement of gas mixture adsorption equilibria of natural gas compounds on microporous sorbents. Adsorption 5 (1999) 199-214. [Pg.394]

With gas mixtures, enhancement of the separation factor can be obtained by preferential sorption of mobile species of one of the components of the gas mixture. Adsorption does not always lead to enhanced separation. In a mixture of light non-adsorbing molecules and heavy molecules, the heavy molecules move slower than the lighter ones but in many cases are preferentially adsorbed. Consequently the flux of the heavier molecules is better enhanced by surface diffusion and the separation factor decreases. This occurs, e.g., in CH4/CO2... [Pg.369]

Gas mixture adsorption is a field that is still waiting for a better theory to explain the experimental data. The Ideal Adsorbed Solution Theory cannot explain aU the facts and needs to be replaced by a new model that includes nonideal effects, and adsorbent surface heterogeneity in particular. This field is acquiring increasing relevance because of its technological impHcations. [Pg.71]

The present paper deals with the threedimensional diagram for description of the equilibrium adsorption of O2/N2 mixtures on clinoptilolite. This diagram shows the dependence of the amount adsorbed on the total pressure, as well as the equilibrium concentration of the gas mixtures. Adsorption from binary mixtures involves theoretical and experimental problems. Ruthven s and Loughlin s works (7,8) provide much detail and they succeed in describing fully enough the complicated systems, but all at the expense of considerable characteristic constants used and elaborate computation. The experimental... [Pg.397]

In chemical, petrochemical and related industries, separation processes are usually responsible for a major part of the production costs. In the separation of gas mixtures, adsorptive processes like Pressure Swing Adsorption (PSA) are being used by small and medium-sized industries, mainly because they have been found more efficient and economical than traditional separation methods. As part of her research project for a... [Pg.298]

Adsorption measurement for multicomponent systems is a function of the composition, temperature, pressure, and properties of adsorbate and adsorbent. As the number of components increases, the number of measurements needed to define the adsorption equilibrium increases rapidly and eventually becomes infeasible. Adsorption equilibrium models are therefore needed to correlate and predict the multicomponent adsorption equilibria. These models should be able to predict the mixture equilibria using the information available on pure component equilibria, as the latter are relatively easy to measure and furthermore there is an abundance of pure component isotherm data available in the literature. As a result, predictive models for gas mixture adsorption are necessary in the design and modeling of adsorption processes. [Pg.407]

Mehta, S.D., and Danner, R.P., An improved potential theory method for predicting gas-mixture adsorption equilibria, Ind. Eng. Chem. Fund., 24(3), 325-330 (1985). [Pg.985]

Moon, H., and Tien, C., Further work on the prediction of gas-mixture adsorption equilibrium using the potential theory, Sep. Technol., 3(3), 161-167 (1993). [Pg.995]

Heslop, M.J. Buffham, B.A., and Mason, G A test of the polynomial-fitting method of determining binary-gas-mixture adsorption equilibria, Ind. Eng. Chem. Res., 35(4), 1456-1466 (1996). [Pg.1000]

Braeuer, P. Salem, M., and Hatting, P Calculation of single adsorption isotherms from gravimetrically measured binary gas mixture adsorption isotherms on activated carbon at high pressures, Sep. Purif Technol., 12(3), 255-263(1997). [Pg.1001]

Measurement of Gas Mixture Adsorption Equilibria of Natural Gas Compounds on Microporous Sorbens,... [Pg.114]

Volumetric / manometric measurements, Chap. 2, and gravimetric measurements, Chap. 3, can be performed simultaneously on the same gas adsorption system in a single instrument. For pure gas adsorption this will not lead to basically new information on the system as both methods lead to the same result, i. e. the reduced mass of the adsorbate phase, cp. Eqs. (2.4) and (3.5). However, for binary gas mixture adsorptives these measurements allow one to determine the masses of both components of the adsorbate without analyzing the (remnant) adsorptive gas mixture, i. e. without needing a gas chromatograph or a mass spectrometer. Measurements of this type seem to have been performed first in the authors group in 1989 and published in 1990, cp. [4.1-4.3], [2.20], [3.20, 3.22] for CH4 / N2 and CH4 / CO gas mixtures at ambient temperature up to pressures of 12 MPa. In fact this method can be used for any binary gas adsorptive with non-isomeric components, i. e. components with different molecular masses. Meanwhile this method has been commercialized by BEL - Japan, Osaka, with this company offering a fully... [Pg.181]

Figure 6.24. Experimental setup for combined dielectric-manometiic measurements of pure gas and gas mixture adsorption equilibria. IFT University of Siegen, 1990. Figure 6.24. Experimental setup for combined dielectric-manometiic measurements of pure gas and gas mixture adsorption equilibria. IFT University of Siegen, 1990.
Today there are several experimental methods available to measure pure gas and gas mixture adsorption equilibria on porous rigid or swelling sorbent materials. All these methods have their specific advantages and disadvantages [1]. Choice of any of them depends mainly on the purpose of measurement and/or accuracy and reliability of data needed. For quick measurements of restricted accuracy gas expansion experiments or volumetric measurements are recommended. If high accuracy data are needed, weighing procedures, i. e. gravimetry should be used... [Pg.69]

Keller J. U., lossifova N. and Zirnmermann W., Volumetric - Densimetric Measurements of the Adsorption Equilibria of Binary Gas Mixtures, Adsorption Science Technology, 23 (No. 9) (2005)... [Pg.70]

Gas mixtures often have moisture. When such a gas mixture is contacted with a porous inorganic adsorbent material or membrane, water vapor may condense in the pores. If gas mixture adsorption or permeation was the objective, condensed water vapor will be a hindrance. A porous inorganic material has pores of 5 nm radius and the temperature of contacting is 25 °C. Water vapor pressure at a temperature T°P can be determined from the Antoine equation (Henley and Seader, 1981) ... [Pg.197]


See other pages where Gas mixture adsorption is mentioned: [Pg.59]    [Pg.407]    [Pg.979]    [Pg.981]    [Pg.997]    [Pg.435]    [Pg.435]    [Pg.95]    [Pg.313]   
See also in sourсe #XX -- [ Pg.59 , Pg.65 , Pg.69 , Pg.334 ]




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