Patent · US Expired

Method for extracting nitrocresols from waste water produced in the manufacture of mononitrotoluene and use of said extract

US7449610B2 · kind B2 · utility

0Cited by

9References

18Claims

0Family size

Assignee

BASF SE

Inventors

Johannes Buettner · Ruhland, DE
Holger Allardt · Schwarzheide, DE
Reinhard Tonder · Klettwitz, DE
Reiner Reetz · Schwarzheide, DE
Michael Reichelt · Ruhland, DE

Key dates

Filing date	Sep 18, 2004
Grant date	Nov 11, 2008
Priority date	—
Expiry date	Jun 16, 2025

Classification

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

Abstract

The invention provides a process for removing nitrocresols from wastewater of mononitrotoluene preparation, which comprises acidifying the alkaline wastewater of mononitrotoluene preparation with acids to a pH of at most 3 and treating the nitrocresols with an extractant.The invention further provides the preparation of dinitrotoluene by use of the nitrocresol-containing extracts as a feedstock.

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