Determination of Moisture Adsorption Isotherm of Shale from Agbada Formation Using GAB Model

Dosunmu, A. and Okoro, Emeka Emmanuel (2012) Determination of Moisture Adsorption Isotherm of Shale from Agbada Formation Using GAB Model. Determination of Moisture Adsorption Isotherm of Shale from Agbada Formation Using GAB Model , 1 (4). pp. 27-33. ISSN 2278 – 9472

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Abstract

Shales are susceptible of different phenomena, including swelling, shrinkage and hydration (shale instability); hence are impacted by moisture content. Moisture adsorption isotherms of shales from Agbada Formation were determined at 27oC over a water activity (aw) range of 0.30 to 0.96 using a Static gravimetric technique. Moisture adsorption isotherms of these two shale samples from well A and well B exhibited the sigmoid type II and V shapes respectively. The Guggenhein, Anderson, de-Boer (GAB) model was applied to fit the experimental data satisfactorily. A non-linear regression analysis method was determined to evaluate the parameters of GAB sorption equations. The criteria used to evaluate the goodness of fit to the model were Quadratic estimates, Central derivatives and Conjugate search of Microsoft Excel. The GAB model was used because it fit to the experimental adsorption data for a wide range of water activity (0.10 – 0.96) and the error square value calculated from Microsoft Excel was low. The estimated GAB parameters and constants were in good agreement with what the model dictates and with literature.

Item Type:	Article
Uncontrolled Keywords:	Shale, adsorption isotherm, GAB model, water activity, monolayer moisture content.
Subjects:	T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Physics Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Dr Emeka Okoro
Date Deposited:	06 Jun 2018 09:34
Last Modified:	06 Jun 2018 09:34
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/10860

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