C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 205/06 (2006.01) C07C 201/08 (2006.01)
Patent
CA 2178699
Dinitrotoluene and isomer mixtures of dinitrotoluene are produced in a single stage, continuous process by nitrating mononitrotuluene or an isomer mixture of mononitrotoluene in which the ortho-mononitrotoluene content is low with a nitrating acid made up of (1) from about 80 to about 100 wt.% inorganic constituents and (2) up to 20 wt.% organic constituents. The inorganic constituents of the nitrating acid include: (a) from about 60 to about 90 wt.% sulfuric acid, (b) from about 1 to about 20 wt.% nitric acid, and (c) at least 5 wt.% water. The organic constituents of the nitrating acid include: from about 70 to about 100 % by weight nitrotoluene isomers and up to about 30% by weight nitration by-products. The nitration reaction is carried out under adiabatic conditions. The molar ratio of nitric acid to mononitrotoluene during the nitration reaction is generally from about 0.7:1 to about 1.4:1. The phases generated during the nitration are subsequently separated and the acid phase is treated to remove at least 5 wt.% of the water present therein. The water may be removed by distillation or flash vaporization, optionally with simultaneous heat supply. After removal of the water, nitric acid having a concentration of from about 50 to about 100 wt.% is added to the treated acid phase in amount sufficient to satisfy the compositional limits for a nitrating acid useful in the process of the present invention. This reconcentrated acid phase is then returned to the nitration reaction.
Klingler Uwe
Schieb Thomas
Wiechers Gerhard
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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