Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2005-10-11
2005-10-11
Parsa, J. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S927000, C568S939000, C568S940000
Reexamination Certificate
active
06953869
ABSTRACT:
The present invention relates to a process for working up organic secondary components which are formed in the one-stage or two-stage nitration of toluene to dinitrotoluene. These organic secondary components are present in the acidic and alkaline waste water from the dinitrotoluene washing step and in the aqueous distillate from the sulfuric acid concentration step, together with small amounts of mononitrotoluene and dinitrotoluene. This process comprisesa) combining the acidic and alkaline waste waters from the washing step and the aqueous distillate from the sulfuric acid concentration step such that the resulting mixture has a pH below 5,b) separating the aqueous and organic phases which form by phase separation, andc) recycling the organic phase from step b) into the nitration process.
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Keggenhoff Berthold
Lorenz Wolfgang
Münnig Jürgen
Wastian Dietmar
Bayer MaterialScience AG
Brown N. Denise
Gil Joseph C.
Parsa J.
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