Patent · US Expired

Method for the production of isophorondiamine (ipda, 3-aminomethyl-3,5,5-trimethyl- cyclohexylamine) having a high cis/tran-isomer ratio

US7256313B2 · kind B2 · utility

2Cited by

4References

20Claims

0Family size

Assignee

BASF SE

Inventors

Frank Funke · Bischofswerda, DE
Thomas Hill · Ludwigshafen, DE
Jobst Rüdiger von Watzdorf · Mannheim, DE
Wolfgang Mattmann · Schifferstadt, DE
Wolfgang Harder · Weinheim, DE
Erhard Henkes · Lorsch, DE
Gerd Littmann · Weinheim, DE
Manfred Julius · Schifferstadt, DE

Key dates

Filing date	Aug 6, 2003
Grant date	Aug 14, 2007
Priority date	—
Expiry date	May 15, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C2601/14
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to processes for preparing 3-aminomethyl-3,5,5-trimethylcyclo-hexylamine (isophoronediamine, IPDA) having a high cis/trans isomer ratio. IPDA having a cis/trans isomer ratio in the range from 63/37 to 66/34 can be obtained in any desired cis/trans isomer ratio, irrespective of temperature, by reacting IPDA with H2 and NH3 in the presence of a hydrogenation catalyst. IPDA having a cis/trans isomer ratio of at least 73/27 which is an important starting material for the synthesis of polyurethanes and polyamides can be obtained by combining this isomerization process with distillative processes.

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