PROCESS FOR PRODUCING 4,6-DIAMINO-REZORCIN DIHYDROCHLORIDE

4,6-bis(phenol-amino)rezorcin is hydrogenized in 1-3C alkanol at 1-10 bar and 20-70[deg]C in the presence of a palladium catalyst on a carrier. An aqueous hydrochloric acid solution is added to the obtained reaction mixture, when hydrogen consumption is stopped. The resulting mixture is post-hydroge...

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Main Authors DUKAI JOZSEF DR, VIDA LASZLO DR, TROCSANYI ZUNO DR, NAGY LAJOS, SZABO LAJOS DR, TUNGLER ANTAL DR, ARANYI PUTER
Format Patent
LanguageEnglish
Published 28.02.2007
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Summary:4,6-bis(phenol-amino)rezorcin is hydrogenized in 1-3C alkanol at 1-10 bar and 20-70[deg]C in the presence of a palladium catalyst on a carrier. An aqueous hydrochloric acid solution is added to the obtained reaction mixture, when hydrogen consumption is stopped. The resulting mixture is post-hydrogenized for at least 10 minutes. Then, the catalyst is filtered, and reaction product is separated from the filtrate, to obtain 4,6-diamino-rezorcin-dihydrochloride.
Bibliography:Application Number: HUP0500396