HCN METHOD FOR REMOVING HCN FROM CRUDE DINITROTOLUENE

摘要

The present invention relates to a process for the production of dinitrotoluene, comprising the steps of: (a) nitrating toluene with a nitrating acid, which is a mixture of nitric acid and sulfuric acid, in one or more nitration steps, and separating the nitrated acid from the process stream thus formed; a crude mixture is obtained comprising dinitrotoluene and a fraction of said nitrated acid dissolved therein, said crude mixture further comprising at least 50 ppm HCN, and (b) the crude dinitro washing the toluene containing mixture in one or more washing steps, wherein before the first washing step is performed, the crude mixture is distilled and/or stripped to remove HCN from the mixture and is substantially free of HCN and wherein a mixture containing crude dinitrotoluene is obtained.