| 摘要 |
Dinitrotoluene is prepared continuously from toluene by carrying out nitration in several vessels arranged in series, the toluene and all the mixed nitric and sulphuric acids required to convert the toluene to dinitrotoluene being introduced into the first vessel, the mixed acid initially containing from 5.0% to 20% by weight of water and the sulphuric acid remaining at the completion of nitration containing from 15% to 25% by weight of water. The nitration is preferably conducted above 60 DEG C. and at not more than 70 DEG C., employing from 2.01 to 2.30 moles of HNO3/mole of toluene. The nitration may be performed in from two to six vessels.
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