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US 6,320,043 B1Granted
Process for preparing fine-particle polysaccharide derivatives
AssigneeWolf Walsrode AG
InventorsGunter Weber, Detmar Redeker, Bernd Klinksiek, Jürgen Hinderer, Benno Ulfik
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Abstract
The invention relates to a new, particularly economic process for preparing pulverulent polysaccharide derivatives, in particular cellulose derivatives, having a thermal flocculation point; the process comprises soaking or dissolving the polysaccharide derivative in a solvent or mixed solvent, dividing/comminuting the soaked or dissolved polysaccharide derivative by thermal and/or mechanical liquid separation and an optional drying step.
Claims29
A process for preparing finely divided polysaccharide derivatives, comprising:
- a) forming an aqueous composition comprising a polysaccharide derivative and water, said composition containing water in an amount of 35 to 99 wt. %, based on the total weight of said aqueous composition, said polysaccharide derivative being soaked or dissolved in said composition;
- b) converting the polysaccharide derivative of said aqueous composition into finely divided solid particles by,
- (i) contacting said aqueous composition with superheated water vapor in a dryer-pulverizer, thereby converting the water of said aqueous composition into the vapor phase, and converting the polysaccharide derivative of said aqueous composition into finely divided solid particles;
- or
- (ii) causing the polysaccharide derivative of said aqueous composition to flocculate, thereby converting the polysaccharide derivative of said aqueous composition into finely divided solid particles;
- and
- c) optionally drying the finely divided solid particles of step b).
4 more elements
Dependencies are inferred from the claim text.