Liquid purification or separation – Processes – Separating
Reexamination Certificate
2005-04-07
2008-03-18
Hruskoci, Peter A. (Department: 1797)
Liquid purification or separation
Processes
Separating
C210S909000, C210S919000, C568S927000
Reexamination Certificate
active
07344650
ABSTRACT:
Alkaline waste waters formed in the washing of crude nitrobenzene which has been prepared by the adiabatic nitration of benzene with nitrating acid, washed in an acidic washing process, and then washed in an alkaline washing process are treated. The alkaline waste water being treated generally contains benzene in a concentration of from about 100 to about 3000 ppm and nitrobenzene in a concentration of from about 1000 to about 10,000 ppm. In the process of the present invention, undissolved benzene and/or nitrobenzene are separated from the alkaline waste water, residual benzene and/or nitrobenzene is/are then optionally stripped out of the alkaline waste water, and the alkaline waste water from which benzene and/or nitrobenzene has been removed is heated to a temperature of from 150 to 500° C. under excess pressure with the exclusion of oxygen.
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Dohmen Wolfgang
Knauf Thomas
Schmiedler Jörg
Von Gehlen Franz-Ulrich
Bayer MaterialScience AG
Hruskoci Peter A.
Whalen Lyndanne M.
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