Volumetric and Phase Behavior in Part of the Nitric Acid-Nitrogen Dioxide-Water System.

Abstract

properties of the bubble-point and dew-point states are recorded in Table II for even values of pressure for each of the temperatures investigated. The molal volume, composition, and the equilibrium ratios of the two components are included. The standard error of estimate of the experimental data from the smooth curves of pressure vs. composition was 0.003 mole fraction. This assumes that all of the uncertainty existed in composition and that none was associated with the measurement of pressure or temperature. The product of the pressure and the equilibrium ratio is shown in Figure 3. The behavior is similar to that found for other binary systems containing methane (11,13,16). The maximum

Phase Equilibria in Hydrocarbon Systems. Volumetric and Phase Behavior of the Methane-Cyclohexane System.

“…McKeown and Belles (11) reported data on the two-phase pressure of nitric acid solutions with water and nitrogen dioxide. The freezing point of the ternary system was studied by Gordon (5) and Küster and Ktemann (9). Sprague (19) proposed an analytical expression to describe the specific weight of the liquid phase of the ternary system at physical equilibrium for atmospheric pressures.…”

Modeling the Solubility of Nitrogen Dioxide in Water Using Perturbed-Chain Statistical Associating Fluid Theory

“…While the experimental data for N 2 /H 2 O are abundantly available in the literature, for example, those shown in Figure , , there is only one set of data available for NO/H 2 O . It is also the case for HNO 3 /NO 2 *, for which only one set of physical equilibrium data is available, while many others are physicochemical data at high concentration of HNO 3 − that follow the dissociation reaction of eq irrelevant to flue gas geologic sequestration. The EOS performance for HNO 3 /NO 2 * is shown in Figure , where it exhibits liquid–liquid equilibrium (LLE) at low temperatures.…”

“…The buildup of the products in eq complicates the situation. At high concentration, HNO 3 will tend to dissociate according to 4 HNO 3 ↔ 4 NO 2 + 2 normalH 2 normalO + normalO 2 which is dominant, for example, in the work series of Sage and co-workers. − …”