Explosives . g readingsof the density of the crude nitro-benzol by a hydrometer in D. and the flowof benzol and acid is regulated accordingly. The column // is of similarconstruction to /. This plant is said to work well. Dinitro-benzene is manufactured in the same way as mono-nitro-benzene. pt that twice as much acid is used. The nitration is generally carried out in two stages, the bulk of the waste acid from the first stage being run away the second lot is run in. For the second stage the acids may with advantage be somewhat stronger and the content- of the nitrating pan NITRO-DERI
Explosives . g readingsof the density of the crude nitro-benzol by a hydrometer in D. and the flowof benzol and acid is regulated accordingly. The column // is of similarconstruction to /. This plant is said to work well. Dinitro-benzene is manufactured in the same way as mono-nitro-benzene. pt that twice as much acid is used. The nitration is generally carried out in two stages, the bulk of the waste acid from the first stage being run away the second lot is run in. For the second stage the acids may with advantage be somewhat stronger and the content- of the nitrating pan NITRO-DERIVATIVES OF AROMATIC HYDROCARBONS 257 are heated, finally to near the boiling-point of water. The waste acid fromthe second stage may be revivified by the addition of strong nitric acid andused for the preliminary nitration of a further charge of benzene. Of thethree isomeric dinitro-benzenes the meta-compound is that principally formed,mixed with only small quantities of ortho- and para-dinitro-benzene. It is. I Ni+robeni Benzoh J- I fatef fofrJ ft hrft
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