ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 2, pp. 213!220. C Pleiades Publishing, Ltd., 2007.
Original Russian Text C G.G. Aseev, I.M. Ryshchenko, A.S. Savenkov, 2007, published in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 2, pp. 213!220.
OF SYSTEMS AND PROCESSES
Equations and Determination of Physicochemical Properties
of Ammonium Sulfate-Nitrate Solutions
G. G. Aseev, I. M. Ryshchenko, and A. S. Savenkov
Khar’kovskii Politekhnicheskii Institut National Technical University, Kharkov, Ukraine
Received July 6, 2005; in final form, June 2006
Abstract-Theoretical and correlation equations for calculation of multicomponent systems were considered
in terms of a previously developed theory of ion3ion interactions in steady- and nonsteady-state processes
for the example of ammonium sulfate-nitrate solutions formed from effluent gases of thermal power plants.
Effluent gases of thermal power plants contain
a significant amount of sulfur dioxide (~7gm
nitrogen oxides (~1.5 g m
), which are discharged
into the atmosphere and contaminate air, soil, and
water basins. Previously a new technology for manu-
facture of ammonium sulfate3nitrate (ASN) fertilizers
from these contaminants has been developed .
The technology includes introduction of gaseous am-
monia, electron-beam processing of dusty effluent
gases, absorption of the forming SO
water, concentration of ASN solutions, evaporation,
Development of new technologies and choice of
the optimal ways of utilization of industrial waste re-
quire that thermodynamics, kinetics, and various phys-
icochemical parameters should be known. The tech-
nology suggested requires particularly reliable and
authentic data on physicochemical properties of con-
centrated solutions of inorganic substances.
The theory of interparticle interactions in steady-
state processes in concentrated electrolyte solutions
 and some implications of this theory  were used
to suggest methods for determination of physicochem-
ical parameters of multicomponent systems. The fol-
lowing properties of the solutions were analyzed: den-
sity, specific heat, thermal conductivity, water vapor
pressure over solution, activity of water, surface ten-
sion, dynamic viscosity coefficient, electrical conduc-
tivity, and boiling and freezing points.
The present study is devoted to analysis of the phys-
icochemical properties of solutions of multicompo-
nent systems based on (NH
with minor additions of NH
, and NH
. The concentrations of
the components in solutions was varied from 10 to
70 wt % at an (NH
ratio equal to
4 and temperatures of 253 80oC.
The density of a multicomponent solution was cal-
culated by the formula
r = r
+ S c
t + A
where r is the solution density (kg m
density (kg m
); h, number of solution components;
c, electrolyte concentration (wt %); t, temperature
(oC); and A
, coefficients found by processing by
methods of regression analysis of the authors’ own
data and those published in the literature for a large
number of electrolytes . The values of these coef-
ficients for the components of the ASN solution are
listed in Table 1.
Table 1. Coefficients of Eq. (1)
Electrolyte ³ A
³ c,wt% ³ t, oC ³ S
³ 4.1148 ³ 30.0101 ³ 0.0165 ³ 0370 ³ 03100 ³ 4.15 ³ 0.26
³ 5.8719 ³ 30.0012 ³ 30.0020 ³ 0370 ³ 03100 ³ 1.89 ³ 0.13
is the root-mean-square error, and ,, average relative error of calculation.