Contactless Weighing Up to High Pressures For Analysing Adsorption And Density of Fluids |
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Authors: | Herbst A Germanus J Harting P |
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Institution: | (1) Institute of Non-Classical Chemistry, University of Leipzig, Permoserstrasse 15, D-04318 Leipzig, Germany |
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Abstract: | Adsorption of supercritical fluids methane, nitrogen and argon by active carbons was studied up to a pressure of 500 bar.
A three-parameter isothermal equation was used to represent the adsorption equilibrium. This isothermal equation is based
on a physical model conception which had already been used for the modelling of adsorption processes with a pressure up to
150 bar. Beside the exact knowledge of the measurable parameters pressure, temperature and fluid composition, the density
of the adsorbate are essential for the evaluation of the adsorption analysis. The fluid density can be determined either via
equations of state, which is normally the most practicable and fastest way, or via lift measurements of a lowering body in
the fluid based on the principle of Archimedes. This work represents and discusses the question of to what extent the fluid
density determined under real conditions via equations of state, using, for example, equation of Bender, corresponds to the
fluid density measured under high-pressure.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | active carbons adsorption high pressure magnetic suspension balance supercritical fluids |
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