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Parametric Optimization and Thermo-dynamic Studies on the Influence of Electrolytes on Sodium Salicylate in Aqueous Solution

Parametrische Optimierung und Thermodynamische Studien zum Einfluss von Elektrolyten auf Natriumsalicylat in wässriger Lösung
Kiran Pawar, Meghal A. Desai and Jigisha Parikh

Abstract

Hydrotropes (amphiphiles) start to aggregate at a certain minimum concentration known as the minimum hydrotrope concentration (MHC), above which an appreciable solubilization of insoluble compounds in aqueous solution is observed. However, the MHC values are very high, thus, limiting the applications of hydrotropes. The salts are found to increase the association tendency of hydrotropes and reduction in the MHC. The present study discusses the effect of various electrolytes (Na+, Mg2+ and K+ series) on the behavior of sodium salicylate at different temperatures. Design of experiment was employed to optimize the process parameters. Furthermore, thermodynamic parameters were investigated to observe the stability of the aggregates at higher temperatures.

Kurzfassung

Hydrotope (Amphiphile) beginnen ab einer bestimmten Minimumkonzentration, die als Minimumhydroptrop-Konzentration (MHK) bekannt ist, zu aggregieren. Oberhalb dieser Konzentration wird eine beträchtliche Löslichkeit von unlöslichen Verbindungen in wässriger Lösung festgestellt. Die MHK-Werte sind jedoch sehr hoch, was die Anwendung von Hydrotropen einschränkt. Es wurden Salze gefunden, die die Assoziation von Hydrotropen steigern und die MHK herabsetzen. Die vorliegende Untersuchung diskutiert den Einfluss verschiedener Elektrolyte (Na+-, Mg2+- und K+-Salze) auf das Verhalten von Natriumsalicylat bei unterschiedlichen Temperaturen. Ein Versuchsdesignverfahren wurde für die Optimierung der Verfahrensparameter verwendet. Des Weiteren wurden thermodynamische Parameter untersucht, um die Stabilität der Aggregate bei höheren Temperaturen zu beobachten.


1 Dr. Jigisha Parikh, Department of Chemical EngineeringSardar Vallabhbhai National Institute of TechnologySurat-395007, GujaratIndia, Tel.: 91-261-2201689, Fax: 91-261-2201641, E-Mail:

Dr. Jigisha Parikh is serving as Associate Professor at Chemical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India. She is having more than 15 years of experience in the academics and about four years industrial experience. She is working in this area since last ten years, also works in the area of biofuel and environment engineering. She has more than 30 peer reviewed international journal publication.

Meghal A. Desai is a faculty member Chemical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India. He is an active researcher in this area since three years. Apart from working in the area of amphiphillic compounds, he is involved in the extraction of phytochemicals from the plant materials using various extraction techniques.

Kiran Pawar is the research student at Chemical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India.


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Received: 2012-7-11
Revised: 2013-4-18
Published Online: 2013-09-09
Published in Print: 2013-07-15

© 2013, Carl Hanser Publisher, Munich