Patent · US Active

Method for processing contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine

US10144662B2 · kind B2 · utility

1Cited by

0References

15Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Manfred Kreczinski · Herne, DE
Robert Jansen · Collinsville, US
Matthias Woyciechowski · Langenselbold, DE

Key dates

Filing date	Nov 24, 2015
Grant date	Dec 4, 2018
Priority date	—
Expiry date	Feb 24, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2209/44
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

Contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine is treated by A) 1. treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by alkaline hydrolysis of isophoronenitrile to isophorone, and the salts of hydrogen cyanide within a pH range of 12.0 to 13.7 and at temperatures of 60 to 200° C., and 2. processing the wastewater from A) 1. by an oxidation, or B) treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by an oxidation, or C) processing the wastewater from A) 1. and the wastewater from the preparation of isophorone and/or the wastewater from the preparation of isophoronediamine by an oxidation.

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