Patent · US Expired

Process for working up the waste water obtained in the preparation of dinitrotoluene

US6936741B2 · kind B2 · utility

57Cited by

10References

10Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Jurgen Munnig · Kaarst, DE
Dietmar Wastian · Dormagen, DE
Wolfgang Lorenz · Dormagen, DE
Berthold Keggenhoff · Krefeld, DE

Key dates

Filing date	Jun 28, 2004
Grant date	Aug 30, 2005
Priority date	—
Expiry date	Jun 28, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2103/36
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous waste waters containing acidic wash water and alkaline wash water from the dinitrotoluene washing step, and distillate from the sulfuric acid concentration step. The process comprises,

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.