Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clays and Clay Minerals Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clays and Clay Minerals; December 2004; v. 52; no. 6; p. 714-720; DOI: 10.1346/CCMN.2004.0520606
© 2004 Clay Minerals Society
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (3)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Özdemir, M.
Right arrow Articles by Kipçak, I.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

DISSOLUTION KINETICS OF SEPIOLITE IN HYDROCHLORIC ACID AND NITRIC ACID

Mine Özdemir* and Ilker Kipçak

Department of Chemical Engineering, Engineering and Architectural Faculty, Osmangazi University, 26480-Bati Meselik, Eskisehir, Turkey

* E-mail address of corresponding author: mnozdemi{at}ogu.edu.tr

The dissolution kinetics of sepiolite in hydrochloric acid and nitric acid were studied in a batch reactor. The effects of reaction temperature, acid concentration, particle size and solid-to-liquid ratio on the dissolution process were investigated. Experimental studies were carried out in the ranges of 25–75°C for reaction temperature, 0.25–1.00 mol/L for acid concentration, 0.00755–0.05020 cm for average particle size and 2.5 to 12.5 g of solid/100 mL of acid for solid-to-liquid ratio. It was determined that the dissolution process is controlled by resistance of the diffusion through the product layer. The activation energies of the process were determined to be 40.8 and 38.3 kJ/mol for hydrochloric and nitric acid, respectively. The apparent rate constants were expressed as a function of reaction temperature, acid concentration, particle radius and solid-to-liquid ratio: k{alpha}e–4910(1/T) Cr–0.6 (s/l)–1 and k{alpha}e–4606(1/T)Cr –0.5 (s/l)–1 for hydrochloric and nitric acid, respectively; k is the apparent rate constant in min–1; T, the reaction temperature (K); C, the acid concentration (mol/L); r, the initial particle radius (cm); s/l, the solid-to-liquid ratio (g of solid/100 mL of acid).

Key Words: Dissolution Kinetics • Hydrochloric Acid • Nitric Acid • Sepiolite




This article has been cited by other articles:


Home page
 Clays and Clay MineralsHome page
M. Onal, H. Yilmaz, and Y. Sarikaya
SOME PHYSICOCHEMICAL PROPERTIES OF THE WHITE SEPIOLITE KNOWN AS PIPESTONE FROM ESKISEHIR, TURKEY
Clays and Clay Minerals, October 1, 2008; 56(5): 511 - 519.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Clay Minerals Society