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General rules for the preparation of tetryl

In technical operations dimethylaniline is employed as a starting material chiefly because it is obtainable more easily and is much cheaper than methylaniline. Moreover, tetryl prepared from dimethylaniline is purer than that from methylaniline. Hence the preparation of tetryl from dimethylaniline is more economic, in spite of the greater consumption of nitric acid by dimethylaniline which uses up nitric acid to oxidize one of the N-methyl groups. The yield is not higher than 80%, due to the side-reactions. [Pg.47]

Since methylamine prepared from methyl alohol and ammonia has become available commercially, the preparation of tetryl from dinitromethylaniline obtained from chlorodinitrobenzene and methylamine has been widely used. [Pg.47]

The yield of nitration of dinitromethylaniline amounts to 95%, hence this method is the more economic. [Pg.47]

Nitration is usually carried out in such a way that the solution of dimethylaniline in sulphuric acid is introduced into a nitrating mixture rich in nitric acid. The nitration reaction proceeds vigorously, and it is therefore most important to control the reaction temperature. Formerly it was believed that for safety s sake the lowest possible temperature of nitration should be maintained. Later it became clear that at such a temperature nitration is not brought to completion and a large quantity of incompletely nitrated products accumulates, which may lead to an [Pg.47]

The nitration method described above is particularly suitable for use in a continuous system. [Pg.48]


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