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AssigneeClariant International Ltd.
InventorsErtan Akgün, Martin Link, Sarah Werner, Klaus Raab, Peter Klug, Karl Scheitzeneder, Stefan Kreuzpointner
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The invention relates to a method for preparing aqueous solutions of N,N-dimethylglucamine, characterized by first preparing an adduct of N-methylglucamine and formaldehyde in water at temperatures of between 15° C. and 40° C., and subsequently reacting said adduct to N,N-dimethylglucamine in the presence of a metal catalyst under hydrogen pressure at 20-68° C., followed by secondary hydrogenation at 70-120 bar and 70-110° C. once hydrogen absorption at 20-68° C. is completed.
A process for preparing N,N-dimethylglucamine comprising the step of reacting an aqueous solution of N-methylglucamine first with an aqueous solution of formaldehyde at 15-40° C. and subsequently, at a pressure of 20-120 bar and a temperature T=30-68° C., with hydrogen under metal catalysis, wherein, after absorption of hydrogen has completed at 20-68° C., a further, after-hydrogenation is added at 70-120 bar and at 70-110° C.
Dependencies are inferred from the claim text.