Experimental measurements and correlation of the solubility of N,N-dialkylamides in supercritical carbon dioxide

Pitchaiah, KC and Lamba, Neha and Deepitha, J and Mohapatra, PK and Madras, Giridhar and Sivaraman, N (2019) Experimental measurements and correlation of the solubility of N,N-dialkylamides in supercritical carbon dioxide. In: JOURNAL OF SUPERCRITICAL FLUIDS, 143 . pp. 162-170.

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Abstract

N,N-Dialkylamides are the potential ligands for the extraction of actinides in nuclear-fuel cycle operations. Supercritical carbon dioxide (SCCO2) containing N,N-dialkylamides is a green solvent for the extraction of actinides with minimum liquid waste generation. In this connection, the solubilities of six N,N-dialkylamides in SCCO2 (313-333 K and 10-20 MPa) were measured to evaluate their utility as extractants for actinide separations. The solubilities are ranging from 0.005 x 10(-3) to 102 x 10(-3) mol mol(-1). The solubility of amides can be improved by increasing pressure and reducing temperature in the investigated region. The internal-consistency of solubility data was tested with Mendez-Teja equation. The solubility data was correlated with Chrastil, Mendez-Teja, solution theory with Wilson activity coefficient model and association theory with van Laar activity coefficient model. The correlation results demonstrated that, association theory with van Laar activity coefficient model predicts the solubilities with an average deviation of < 8% and is best among the models studied.

Item Type:	Journal Article
Publication:	JOURNAL OF SUPERCRITICAL FLUIDS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright for this article belong to ELSEVIER SCIENCE BV
Keywords:	Supercritical carbon dioxide; N,N-Dialkyl amides; Semi-empirical model; Solubility; Supercritical fluid extraction
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	07 Dec 2018 06:40
Last Modified:	07 Dec 2018 06:40
URI:	http://eprints.iisc.ac.in/id/eprint/61208

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