The invention is directed to a process for degrading aromatic nitro compounds by
reaction with a sufficient amount of ozone to virtually completely destroy the
aromatic nitro compounds. Two specific embodiments appear in the claims set forth
infra. In the first embodiment the aromatic nitro compounds are virtually completely
destroyed down to inorganic components. In the second embodiment the aromatic nitro
compounds are virtually completely destroyed while the reaction with ozone is initiated
at a pH of 12.
THE CLAIMS
Claims 1 and 3 are illustrative of appellants’ invention and are reproduced
below.
1. A process for degrading aromatic nitro compounds in wastewaters from
nitrobenzene production plants which consists essentially of treating said wastewaters
containing aromatic nitro compounds with ozone, in an amount sufficient to virtually
completely destroy said aromatic nitro compounds down to inorganic components, at
20 to 100°C, 1.5 to 10 bar and pH 7 to 9.
3. A process for degrading aromatic nitro compounds in wastewaters from
nitrobenzene production plants by reaction with ozone, in an amount sufficient to
virtually completely destroy said aromatic nitro compounds, wherein the degradation
reaction, at a temperature of from 20 to 100°C and a pressure of from 1.5 to 10
bar absolute, is started at pH 12 and the pH level is maintained above pH 4.5 until the
reaction is completed.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references.
V. Caprio et al., Chemical Abstract 102:172028f (Chemical Abstract
102:172028f) "Ozonation of aqueous solutions of nitrobenzene,” Vol. 102 Number
20, p. 341, (May 20, 1985).
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