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Solubility of Picric Acid

The most versatile derivative from which the free base can be readily recovered is the picrate. This is very satisfactory for primary and secondary aliphatic amines and aromatic amines and is particularly so for heterocyclic bases. The amine, dissolv in water or alcohol, is treated with excess of a saturated solution of picric acid in water or alcohol, respectively, until separation of the picrate is complete. If separation does not occur, the solution is stirred vigorously and warmed for a few minutes, or diluted with a solvent in which the picrate is insoluble. Thus, a solution of the amine and picric acid in ethanol can be treated with petroleum ether to precipitate the picrate. Alternatively, the amine can be dissolved in alcohol and aqueous picric acid added. The picrate is filtered off, washed with water or ethanol and recrystallised from boiling water, ethanol, methanol, aqueous ethanol, methanol or chloroform. The solubility of picric acid in water and ethanol is 1.4 and 6.23 % respectively at 20°. [Pg.57]

Solubility of Picric Acid in Water Solubility of Picric Acid in Nitric Acid... [Pg.764]

Solubilty. Doliriski [41] gave the following figures for the solubility of picric acid in water at various temperatures (Table 109) (see also Findlay [41a]). [Pg.487]

The solubility of picric acid in sulphuric acid varies with the concentration of the latter. It is highest for concentrated acid and lowest in 18-20% acid. This can be seen from Table 110 [41b]. [Pg.487]

SOLUBILITY OF PICRIC ACID IN NITRIC ACID (DRUCKER [42])... [Pg.488]

The solubility of picric acid in aqueous solutions of methyl-, ethyl-, isopropyl-and n-propyl alcohols, as well as of acetone has also been determined (Duff and... [Pg.488]

SOLUBILITY OF PICRIC ACID IN AQUEOUS SOLUTIONS OF ORGANIC SOLVENTS... [Pg.488]

Washings are collected in special wooden tanks for settling. The spent acid is also added to the washings so as to bring the H2S04 content to 10-30% as in such an acid water the solubility of picric acid is at its lowest. The water is decanted from time to time and disposed off into the river, after being neutralized, while the settled picric acid is collected from the bottom of the tank. [Pg.509]

See other pages where Solubility of Picric Acid is mentioned: [Pg.764]    [Pg.764]    [Pg.764]    [Pg.487]    [Pg.488]    [Pg.508]    [Pg.765]    [Pg.765]    [Pg.765]    [Pg.765]    [Pg.101]   


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