processo para a preparaÇço de Éteres cÍclicos com cinco membros ou com seis membros, especialmente de anidropoliàis e mistura de anidrohexitol

Process for producing 5- or 6-membered cyclic ethers (anhydropolyols) comprises subjecting polyols having at least 4 C atoms and at least 2 OH groups to cyclodehydration at at least 100 degrees C in the presence of water, an acid catalyst, an acid-stable hydrogenation catalyst and hydrogen. Preferab...

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Bibliographic Details
Main Authors RUDOLF WANHEERTUM, AGNES BOURREL, THOMAS HAAS, MARCUS MORAWIETZ, OLAF BURKHARDT
Format Patent
LanguagePortuguese
Published 18.11.2008
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
APPARATUS THEREFOR
CHEMISTRY
DERIVATIVES THEREOF
GENERAL METHODS OF ORGANIC CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
NUCLEIC ACIDS
NUCLEOSIDES
NUCLEOTIDES
ORGANIC CHEMISTRY
SUGARS
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Summary:Process for producing 5- or 6-membered cyclic ethers (anhydropolyols) comprises subjecting polyols having at least 4 C atoms and at least 2 OH groups to cyclodehydration at at least 100 degrees C in the presence of water, an acid catalyst, an acid-stable hydrogenation catalyst and hydrogen. Preferably the reaction temperature is 100-380 degrees C, preferably 180-280 degrees C. The H2 pressure is 1-20 MPa, preferably 3-10 MPa. The hydrogenation catalyst comprises Ru, Rh, Pd and/or Pt as metals or metal compounds. The hydrogenation catalyst is used in an amount of 0.001-10 (preferably 0.01-1) wt.% based on the polyol. The acid catalyst is a 1-10C aliphatic carboxylic acid, preferably formic, acetic or propionic acid. The acid catalyst is used in an amount of 0.1-20 (especially 0.5-10) wt.% based on the polyol. The polyol is a tetritol, pentitol or hexitol.
Bibliography:Application Number: BR19989804474