High purity 2,4-dinitrotoluene from toluene nitration process

Details High purity 2,4-dinitrotoluene from toluene nitration process High purity 2,4-dinitrotoluene from toluene nitration process

C - Chemistry, Metallurgy

07

C

260/610.9, 260/6

C07C 205/06 (2006.01) C07C 201/16 (2006.01)

Patent

CA 1173062

ABSTRACT A method for preparing substantially pure 2,4-DNT isomer from its admixture with other DNT isomers which cumprifies contacting the isomer mixture with aqueous sulfuric acid at an elevated temperature separating excess DNT isomer mixture from the sulfuric acid phase and cooling the sulfuric acid phase. Also in a method for producing dinitrotoluenes which comprises: (a) nitrating toluene in a first nitration stage with an aqueous mixture of sulfuric aod nitric acids to form an organic phase containing mononitrotoluenes and a first aqueous spent acid phase; (b) separating the organic phase from the first aqueous spent acid phase; (c) nitrating the mononitrotoluenes contained in the organic phase in a second nitration stage using a mixture of sulfuric and nitric acids to form an organic phase containing dinitrotoluenes and a second aqueous spent acid phase; aqd (d) separating the organic phase from the second aqueous spent acid phase for recovery of the dinitrotoluene product from the organic phasc; the novel feature comprising: (e) cooling at least a portion of the first or second aqueous spent acid phase to a temperature sufficient to effect crystallization of substantially pure 2,4-DNT; (f) recovering the 2 4-DNT crystals from the cooled aqueous spent acid phase; and (g) returning the portion of the cooled spent acid phase to a nitration stage.

400219

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