A method for producing anionic saccharides
AssigneeKemira Oyj
InventorErkki Johannes METSÄLÄ
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Abstract
The disclosure relates to a method for producing anionic saccharides by reacting saccharide with a compound having a conjugated electron withdrawing group via oxa-Michael addition reaction for producing a derivatized saccharide followed by anionizing the derivatized saccharide. The disclosure further relates to anionic saccharides and to use of the anionic saccharides, for example, as flocculants in waste water treatment, as an agent on enhanced oil recovery and as an agent in paper industry.
Claims12
A method for producing anionic saccharides, comprising reacting saccharide with a compound having a conjugated electron withdrawing group via oxa-Michael addition reaction in presence of a base or mixture of bases for producing a derivatized saccharide and anionizing the derivatized saccharide, wherein the compound having a conjugated electron withdrawing group is selected from one of the following compounds III-VI
- or a sodium, potassium or lithium salt thereof.
A derivatized saccharide comprising glucose, starch or cellulose derivatized with a compound selected from the compounds III-VI
- or a sodium, potassium or lithium salt thereof.
An anionic saccharide comprising anionic saccharides having formulas XI-XIV
- or a sodium, potassium or lithium salt thereof;
- wherein A represents a monosaccharide, a disaccharide, an oligosaccharide or a polysaccharide;
- and O having a bound to A is an oxygen atom of the monosaccharide, the disaccharide, the oligosaccharide or the polysaccharide.
(canceled)
Dependencies are inferred from the claim text.