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40 .   Modeling and optimization of Al-pillaring process using experimental design procedure

Authors: Ana-Maria Georgescu, Gabriela Muntianu, Ileana Denisa Nistor, Fran├žoise Nardou

Volume 23, Issue 4;
Pages: 212-216; 2017
ISSN: 2069-0053 (print) (former ISSN: 1453-1399), Agroprint;
ISSN (online): 2068-9551



Abstract:

Calcium bentonite from Orasu Nou deposit (Romania) has been used in order to obtain Al-pillared bentonites, which are microporous materials with special properties. The pillaring process consists in the following steps: bentonite purification, ionic exchange of bentonite, preparation of pillaring agent, intercalation of the exchanged bentonite with pillaring agent and calcination. The pillared clays present a rigid structure, a high termic stability given by the oxido-metallic pillars formed after calcination. This paper presents the application of the kn experiment design procedure for simulation and optimization of the Al(III)-pillaring process. There were performed 9 experiments according to the experimental design procedure. The input variables were calcination temperature (x1) and calcination duration (x2) and the output variable was the basal spacing, d001 (Y). The optimal conditions for Al-pillared bentonites synthesis were obtained for a calcination duration of 114 min and a calcination temperature of 457oC. The material with these optimal calcination parameters will be used in liquid effluents remediation.

Keywords: calcium bentonite, pillaring process, calcination, basal spacing, modeling, optimization

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