AMMONIUM BISULFATE CATALYZED DEHYDRATION OF BETA-HYDROXY ACIDS

AMMONIUM BISULFATE CATALYZED DEHYDRATION OF BETA-HYDROXY ACIDS

Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammon ium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acryl ic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisu lfate reduces or eliminates the prob...

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Bibliographische Detailangaben
Hauptverfasser: HOYT, SARAH, SILVANO, MARK A, LEMONDS, ANDREW M, BOGAN, LEONARD E, BISWAS, SANJIB, DECOSTER, DAVID C, SATHIOSATHAM, MUHUNTHAN, HRUBY, SARAH L, ROACH, RAYMOND P, TENGLER, ROBERT
Format: Patent
Sprache:eng ; fre
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammon ium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acryl ic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisu lfate reduces or eliminates the problems associated with processes that use sulfuric acid as a dehydrating catalyst, e.g, excess sulfuric acid consumption and/or recovery. Selon la présente invention, des acides hydroxycarboxyliques, par exemple, l'acide 3-hydroxypropionique, et/ou leurs sels d'ammonium sont déshydratés en leurs acides carboxyliques insaturés correspondants, par exemple, l'acide acrylique, par un procédé qui utilise un catalyseur comprenant du bisulfate d'ammonium. L'utilisation de bisulfate d'ammonium réduit ou élimine les problèmes associés aux procédés qui utilisent l'acide sulfurique en tant que catalyseur de déshydratation, par exemple, la consommation et/ou la récupération d'acide sulfurique en excès.