Process for clean modification of polysaccharides

Process for clean modification of
polysaccharides
Notre référence :
85415-01
Status des brevets
French patent
application FR0208851
filed on July 12, 2002,
entitled "Procédé pour
l'obtention de
polysaccharides
modifiés"•
Inventeurs
Alexander SOROKIN
Sveltana SOROKINA
Pierre GALLEZOT
TECHNICAL DESCRIPTION
The invention describes a new catalytic process for the clean modification of
polysaccharides obtained from renewable cheap raw materials (starch, cellulose,
cellulose esters and ethers, inulin, guar gum, etc.) by oxidation with hydrogen
peroxide. The conversion of polysaccharides is achieved via a one-pot process easy to
scale up. The catalyst is cheap, available commercially and only minute amounts are
required. The oxidation converts part of the alcohol functions to carboxylic and
carbonyl functions whereby increasing the hydrophilic properties of the natural
polysaccharides which make them suitable for various applications.
DEVELOPMENT STAGE
The oxidation of various polysaccharides has been developed at laboratory pilot
scale (Kg), but the scaling up is very easy. The oxidation is run at near-room
temperatures and atmospheric pressure and needs only conventional equipment available
e.g. in the food industry. The oxidation is easy to control by adjusting the reaction
parameters.
BENEFITS
The one-pot chemical modification of natural polysaccharides leads to tailor-made
products that can be used for several applications.
This process is simple, flexible and environmentally benign. Differently modified
polysaccharides can be prepared in one step with yields close to 100%. The modified
natural polymers do not have to undergo REACH registration.
INDUSTRIAL APPLICATIONS
Status Commercial
Non-exclusive licenses
and collaborative
research
Laboratoires
Institut des Recherches
sur la Catalyse, a
CNRS laboratory UPR
5401 in Lyon, France.
Modified polysaccharides are used in several domains such as paper industry, painting
and coating industry, adhesives and binders, detergents (phosphates substitutes), water
absorbents, pharmaceutical industry (excipients and formulation compounds) and as food
ingredients.
For further information, please contact us (Ref 85415-01)
Mots clés :
Polysaccharide Starch
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