Patent · US Expired

Production of aromatic diamino compounds using a modified Raney catalyst

US4792626A · kind A · utility

32Cited by

4References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Dieter Becher · Brunsbüttel, DE
Udo Birkenstock · Ratingen, DE
Eckart Waldau · Bocholt, DE
Harro Witt · Kuden, DE

Key dates

Filing date	Oct 10, 1986
Grant date	Dec 20, 1988
Priority date	—
Expiry date	Oct 10, 2006

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C209/36
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Aromatic diamino compounds are produced by hydrogenating the corresponding dinitro compounds in the presence of a modified Raney catalyst. The modified Raney catalyst is obtained by treating an alloy made up of 50-95 wt % of aluminum, 4-45 wt % nickel and/or cobalt and 1-46 wt % of at least one modifying metal with an alkali material. The modifying metal is selected from the metals of the first, fourth, fifth, sixth, seventh and eighth subgroups of the Periodic Table of Elements. The hydrogenation is preferably carried out at from 170.degree. to 250.degree. C. and a pressure of 15-50 bar. The heat generated during hydrogenation is preferably used to produce steam.

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