When stearic acid is heated with an equal volume of nitric acid of density 1.284, an abundant disengagement of deutoxide and peroxide of nitrogen
takes place as soon as the mixture boils. If the mixture is then allowed to cool the stearic acid separates apparently unaltered, but really converted
entirely into margaric acid, while the nitric acid contains no foreign substances in determinable quantity. By the prolonged action of the boiling
acid on margaric acid, the latter is gradually but completely dissolved, and the more readily if the nitric acid be renewed from time to time; the
solution then contains suberic acid, succinic acid, and an oily substance soluble in nitric acid (Bromeis).
Suberic acid: ... It is prepared by evaporating the solution of stearic or margaric acid in nitric acid to one half and allowing it to rest;
the solution in 24 hours becomes a semi-solid mass, which is thrown into a funnel to drain, and washed with cold water. When expressed and
crystallized several times it forms pure suberic acid.
[...]
Succinic acid: This acid has long been derived by the distillation of amber (page 614) and exists according to several observers in the resin
of some Coniferae. The mother liquor which remains after the separation of suberic acid in the process described above, contains succinic
acid soiled with suberic acid. The solution with the washings of the suberic is evaporated to crystallization, the product dried and treated with
ether in the cold, which easily dissolves suberic acid while it leaves the succinic acid behind in great measure. The latter may be purified
completely by sublimation. |