Process for working up waste water from nitrobenzene preparation

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United States of America Patent

PATENT NO 9771290
APP PUB NO 20160075582A1
SERIAL NO

14784443

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The present invention provides a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein

    (i) the alkaline waste water is heated to a temperature of from 150° C. to 500° C. under an increased pressure with respect to atmospheric pressure with exclusion of oxygen;(ii) a base is added to the waste water obtained in (i); and(iii) the waste water obtained in (ii) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.

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Patent Owner(s)

  • COVESTRO DEUTSCHLAND AG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Knauf, Thomas Dormagen, DE 60 250
Mairata, Antoni Dusseldorf, DE 6 13
Sluyts, Erik Brasschaat, BE 18 4
Van, Tricht Jan Ekeren, BE 2 4

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