Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1996-06-04
1997-09-02
Cintins, Marianne M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568927, 568932, C07C20506
Patent
active
056634625
ABSTRACT:
Dinitrotoluene and isomer mixtures of dinitrotoluene are produced in a single stage, continuous process by nitrating mononitrotoluene 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 carrier 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.
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Klingler Uwe
Schieb Thomas
Wiechers Gerhard
Bayer Aktiengesellschaft
Cintins Marianne M.
Gil Joseph C.
Jones Dwayne C.
Whalen Lyndanne M.
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