Densities of concentrated alkaline aluminate solutions at temperatures from (323 to 573) K and 10 MPa pressure

Hnědkovský, L., Königsberger, E.ORCID: 0000-0002-4606-0741, Königsberger, L.C., Cibulka, I., Schrödle, S., May, P.M. and Hefter, G. (2010) Densities of concentrated alkaline aluminate solutions at temperatures from (323 to 573) K and 10 MPa pressure. Journal of Chemical and Engineering Data, 55 (3). pp. 1173-1178.

Abstract

Densities of highly alkaline sodium aluminate Solutions have been measured by vibrating-tube densimetry over the temperature range 323 <= T/K <= 573 at a pressure of 10 MPa. Ionic strengths, 1, of these mixed solutions were 1 <= l/mol.kg(-1) <= 6, and the degree of Substitution of hydroxide by aluminate, alpha, ranged from 0.1 <= alpha <= 0.4, where alpha = m(A)/m and m(A) and m (= l) ire the aluminate and total molalities, respectively. Apparent molar volumes, V-phi, derived from the density data for the (NaOH + NaAl(OH)(4))(aq) Solutions, were found to follow Young's rule; that is, they depended linearly on the level Of Substitution of aluminate for hydroxide at all temperatures. The slopes of the Young's rule plots were independent of ionic strength at a given temperature but depended linearly on temperature. It is therefore possible to model V-phi (and hence the densities) of ternary (NaOH + NaAl(OH)(4))(aq) mixtures using only two parameters in addition to those needed for the correlation of the binary NaOH(aq) Solutions. This also means that the standard state (infinite dilution) partial molar volumes, V-2 degrees, of pure, hypothetical NaAl(OH)(4)(aq) call readily be obtained from V-2 degrees for NaOH(aq) by linear extrapolation using the two Young's rule parameters.

Item Type:	Journal Article
Murdoch Affiliation(s):	School of Chemical and Mathematical Science
Publisher:	American Chemical Society
Copyright:	© American Chemical Society
URI:	http://researchrepository.murdoch.edu.au/id/eprint/1544

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