The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2011
Filed:
Dec. 07, 2005
Thomas Hirth, Bühl, DE;
Rainer Schweppe, Karlsruhe, DE;
Jürgen Graf, Pfinztal, DE;
Rainer Busch, Baden-Baden, DE;
Matthias Pursch, Rheinmünster, DE;
Thomas Hirth, Bühl, DE;
Rainer Schweppe, Karlsruhe, DE;
Jürgen Graf, Pfinztal, DE;
Rainer Busch, Baden-Baden, DE;
Matthias Pursch, Rheinmünster, DE;
Abstract
Disclosed is a method for producing polyalcohols in the form of sugar alcohols from the group comprising sorbitol and mannitol and other optional Cto Cpolyols. According to said method, a monosaccharide, disaccharide, oligosaccharide, or polysaccharide containing at least one glucose unit and/or at least one fructose unit is continuously reacted with hydrogen at an elevated temperature and at a great pressure in an aqueous phase in the presence of a hydrogenating catalyst based on ruthenium or ruthenium oxide so as to obtain the inventive polyalcohols. The minimum temperature is set at 100° C. while the minimum pressure is set at 150 bar and the maximum dwell time of the reactants during catalytic hydrogenation is set at 600 s. The inventive method is particularly suitable for producing the sugar alcohols sorbitol and/or mannitol or Cto Cpolyols from glucose, fructose, or disaccharides, oligosaccharides, or polysaccharides containing glucose units or fructose units, especially saccharose, practically all the used saccharides being reacted without turning into caramel. Furthermore, the yield of said sugar alcohols or Cto Cpolyols is exceptionally high while the selectivity for the desired products can be varied in a simple manner within broad boundaries.