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The Production of Various Adsorbents from Lignite, and the Thermal Conductivity of the Optimum Adsorbent under Methane at Low Pressures
Author(s) -
McCarroll S. C.,
Spedding P. L.,
Allen S. J.
Publication year - 1999
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500070105
Subject(s) - adsorption , methane , langmuir , pyrolysis , chemistry , thermal conductivity , freundlich equation , raw material , analytical chemistry (journal) , materials science , chromatography , organic chemistry , composite material
A series of adsorbents were produced from the lignite by pyrolysis in a furnace over a range of temperatures, from 600 to 900°C, for half an hour. The lignite based granular chars were produced from its normal raw state, and also after chemical pretreatment of the chars by agitation with 1% and 2% ZnCl 2 wt/wt solutions for one hour. Static Equilibrium Isotherms using methane as the adsorbate were determined at 20°C for all the samples produced, and the adsorbent with the optimum uptake determined. The actual isotherms obtained were compared against the Freundlich and Langmuir Theories. Thermal conductivity tests using the Probe Technique were carried out at 20°C on the samples again using methane as the adsorbate. The relative pressure of the methane ranged from approximately zero to 0.95. The thermal conductivity values obtained were compared and contrasted against the actual isotherms obtained at this temperature.