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The solid−liquid phase equilibrium and mutual solubility for the ternary 3-chlorophthalic acid 4-chlorophthalic acid water system were determined at (283.15 and 313.15) K. The phase diagrams of the system were constructed on the basis of the measured solubility. The solid phases formed in the studied system were confirmed by Schreinemaker’s method of wet residues. At (283.15 and 313.15) K, both 3-chlorophthalic acid and 4-chlorophthalic acid were formed in the ternary 3-chlorophthalic acid 4-chlorophthalic acid water system. Besides, an adductive compound with the formula (3-C6H3Cl(COOH)2·4-C6H3Cl(COOH)2) existed. The crystallization field of 3-chlorophthalic acid was larger than that of the adduct or 4-chlorophthalic acid at each studied temperature. The solubility data and the ternary phase diagram for the system of 3-chlorophthalic acid 4-chlorophthalic acid water at (283.15 and 313.15) K can provide the fundamental basis for the preparation of 3-chlorophthalic anhydride from 3-chlorophthalic anhydride and 4-chlorophthalic anhydride mixtures. [ABSTRACT FROM AUTHOR]

The solubility of 3-chlorophthalic anhydride and 4-chlorophthalic anhydride in ethyl acetate, acetone, and 1,4-dioxane and the solubility of 3-chlorophthalic acid and 4-chlorophthalic acid in water were measured using Schreinemaker’s wet residue method at temperatures ranging from (283.15 to 333.15) K at atmospheric pressure. Results of these measurements were correlated with the modified Apelblat equation. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

In this investigation, the mutual solubilities for the ternary o-nitrobenzoic acid + m-nitrobenzoic acid + ethanol system were measured at (273.15, 283.15, and 293.15) K, respectively. The isothermal phase diagrams of the system were constructed on the basis of the measured solubilities. Two solid phases were formed and confirmed by the Schreinemakers wet residue method, and the two were identified as o-nitrobenzoic acid and m-nitrobenzoic acid. The solubility fields of two solid phases were observed from the phase diagram. The phase diagrams of the ternary system are similar at the different temperatures. The crystallization regions of 2-nitrobenzoic acid and 3-nitrobenzoic acid increase as the temperature decreases. The solubility data and the ternary phase diagram can provide the fundamental basis for separation of the mixture of isomeric nitrobenzoic acids. [ABSTRACT FROM AUTHOR]