Patent · US Active

Process for workup of NOx-containing offgases from wastewater streams of nitration plants

US9630866B2 · kind B2 · utility

4Cited by

7References

17Claims

0Family size

Assignee

BASF SE

Inventors

Ruediger Fritz · Bernsdorf, DE
Renate Hempel · Ruhland, DE
Michael Zoellinger · Eislingen/Fils, DE
Holger Allardt · Schwarzheide, DE
Reiner Reetz · Schwarzheide, DE

Key dates

Filing date	Dec 13, 2010
Grant date	Apr 25, 2017
Priority date	—
Expiry date	Jun 15, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2209/06
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The present invention relates to a process for workup of nitrite-comprising alkaline process wastewaters from the nitration of aromatic compounds, wherein the alkaline process wastewater is acidified by addition of acids and the offgas which comprises nitrogen oxides and escapes from the acidified process wastewater is worked up, comprising the steps of

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