Invention Grant
- Patent Title: Process for scrubbing dinitrotoluene
- Patent Title (中): 洗涤二硝基甲苯的方法
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Application No.: US13870506Application Date: 2013-04-25
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Publication No.: US09249083B2Publication Date: 2016-02-02
- Inventor: Samuel Neto , Ruediger Fritz , Renate Hempel , Holger Allardt , Barbara Becker , Julia Leschinski , Sebastian Ahrens , Heinrich Hermann , Mirko Haendel , Juergen Poehlmann
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen DE Cologne
- Assignee: BASF SE,Josef Meissner GmbH & Co. KG
- Current Assignee: BASF SE,Josef Meissner GmbH & Co. KG
- Current Assignee Address: DE Ludwigshafen DE Cologne
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Main IPC: C07C205/00
- IPC: C07C205/00 ; C07C201/00 ; C07C205/06 ; C07C201/06

Abstract:
The invention relates to a process for scrubbing a crude mixture comprising dinitrotoluene, nitric acid, nitrogen oxides and sulfuric acid obtained in the nitration of toluene after the nitrating acid has been separated off, which comprises two scrubbing steps (SS-I) and (SS-II), wherein i) in a first scrubbing step (SS-I), the crude mixture is extracted with a scrubbing acid I comprising nitric acid, nitrogen oxides and sulfuric acid in a scrub comprising at least one extraction stage, where the scrubbing acid discharged from the first extraction stage (SS-I-1) of the first scrubbing step (SS-I) has a total acid content of from 20 to 40% by weight and a prescrubbed crude mixture is obtained, ii) in a second scrubbing step (SS-II), the prescrubbed crude mixture comprising dinitrotoluene is extracted with a scrubbing acid II in a scrub comprising at least one extraction stage, where the scrubbing acid discharged from the first extraction stage (SS-II-1) of the second scrubbing step (SS-II) has a pH of less than or equal to 4 and a mixture comprising dinitrotoluene which is essentially free of nitric acid, sulfuric acid and nitrogen oxides is obtained.
Public/Granted literature
- US20140039227A1 PROCESS FOR SCRUBBING DINITROTOLUENE Public/Granted day:2014-02-06
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