Method for producing cis- and trans-enriched MDACH

US10336668B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jan-Oliver Weidert · Schifferstadt, DE
• Sandra Kramp · Mannheim, DE
• Regina Benfer · Altrip, DE
• Alexander Panchenko · Ludwigshafen, DE
• Andreas Weickgenannt · Ludwigshafen, DE
• Norbert Gutfrucht · Lambrecht, DE
• Klaus Breuer · Speyer, DE
• Artur KOZICKI · Bad Dürkheim, DE
• Ralph Busch · Olney, US

Key dates

• Filing date: Nov 18, 2015
• Grant date: Jul 2, 2019
• Expiry date: Feb 11, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for preparing trans-enriched MDACH, including: distilling an MDACH starting mixture in the presence of an auxiliary, which is an organic compound having a molar mass of 62 to 500 g/mol, a boiling point at least 5° C. above the boiling point of cis,cis-2,6-diamino-1-methylcyclohexane, and 2 to 4 functional groups, each of which is independently an alcohol group or a primary, secondary or tertiary amino group. The MDACH starting mixture includes 0 to 100% by weight of 2,4-MDACH and 0 to 100% by weight of 2,6-MDACH, based on the total amount of MDACH present in the MDACH starting mixture. The MDACH starting mixture includes both trans and cis isomers. Trans-enriched MDACH includes 0 to 100% by weight of 2,4-MDACH and 0 to 100% by weight of 2,6-MDACH, where the proportion of trans isomers in the mixture is higher than the proportion of trans isomers in the MDACH starting mixture.