The equilibrium solubility of 3- and 4-nitrophthalic acids in water was measured experimentally using
Schreinemaker's wet residue method at temperatures ranging from (285.15 to 348.15) K at atmospheric pressure.
The solubility of 3- and 4-nitrophthalic acids in water increased with the increase of temperature. The experimental
solubility is correlated by an empirical equation. The calculated values via the empirical equation agreed well
with experimental results for 3- and 4-nitrophthalic acids.
In this investigation, the mutual solubilities for ternary 2-nitrobenzoic acid-3-nitrobenzoic acidacetone system were measured at 283.15 K and 313.15 K, respectively. Two partial isothermal phase diagrams of the system were constructed on the basis of the measured solubilities, one at 283.15 K and the other at 313.15 K. The phase diagrams of the ternary system are similar at the different temperature. Two solid phases were formed and confirmed by the Schreinemaker's wet residue method, and the two were identified as 2-nitrobenzoic acid and 3-nitrobenzoic acid. The crystallization regions of 2-nitrobenzoic acid and 3-nitrobenzoic acid increase as the temperature decreases.
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