[12] Patent
[11] Patent No.:GC0010755  
[45] Date of Publishing the Grant of the Patent: 30/Sep /2019                62/2019  
Number of the Decision to Grant the Patent:2019/156969
Date of the Decision to Grant the Patent:12/Sep/2019

[21] Application No.:GC 2014-27004

[22] Filing Date:17/4/2014

[30] Priority:

[33] State [32] Priority date [31] Priority No.
EP
18/4/2013
13164307.4

[72] Inventors:1- Dr. Thomas KNAUF،2- Dr. Antoni MAIRATA،3- Dr. Erik SLUYTS ،4- Dr. Jan VAN TRICHT

[73] Owner: BAYER MATERIALSCIENCE AG, 51368 Leverkusen, Leverkusen, Germany

[74] Agent: Kadasa Law Firm

  

 

  

[51]IPC:
Int. Cl.: C02F 9/02, 9/10; C07C 201/16 (2006.01)

[56] Cited Documents:

-WO 2012025393 A1 (BASF SE [DE]; LESCHINSKI JULIA [BE]; DENISSEN LEO [BE]; HECK LUDWIG E) 1 March 2012
-EP 1593654 A1 (BAYER MATERIALSCI ENCE AG [DE]) 9 November 2005
-US 2012078015 A1 (ZEEUW AREND-JAN [BE] ET AL) 29 March 2012
 
Examiner: Eng. Abdulaziz S. AlMotek

[54] PROCESS FOR WORKING UP WASTE WATER FROM NITROBENZENE PREPARATION
[57] Abstract: The invention relates to 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 under an increased pressure with respect to atmospheric pressure with exclusion of oxygen and is then cooled and let down; (ii) the waste water obtained in (i) 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;(iii) the liquid process product obtained in (ii) by cooling the stripping gas stream loaded with impurities is separated into an aqueous and an organic phase and the organic phase is used further in an aniline production process.
No. of claims: 9


 

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