Patent ID: 7344650
Filing Date: 2008-03-18
Classification: C02F,C07C,Y10S

Abstract:
1. A process for treating alkaline waste waters containing from tout 100 to about 3000 ppm ben zone and from about 1000 to 10,000 ppm nitrobenzene which waste water was generated by washing crude nitrobenzene produced by adiabatic nitration of benzene with nitric acid with an acid and then an alkaline material comprising: a) separating the alkaline waste water into an organic phase containing undissolved benzene and/or nitrobenzene and an aqueous phase of alkaline waste water, b) stripping residual benzene and/or nitrobenzene from the aqueous phase of alkaline waste water, and c) heating the stripped aqueous phase of alkaline waste water to a temperature of from about 150 to about 500° C. at an absolute pressure of from 50 to 350 bar in the absence of oxygen.