Method of producing perborate
AssigneeDegussa AG
InventorsKlaus Koester, Franz-Josef Carduck, Ulrich Jahnke, Seamus French
Life of this patent
Estimating the term…
Abstract
A method for the production of granular sodium perborate tetrahydrate is disclosed herein. The method includes the steps of adding 0.3-5% by weight of a sodium salt or a potassium salt of a polymeric carboxylic acid to powdered perborate tetrahydrate, softening the mixture by heating under pressure to form a plastically deformable mass, deforming the plastically deformable mass into thin strands by pressing, and comminuting the strands into granular form. The perborate tetrahydrate may be de-watered to produce granular perborate monohydrate. The final granular products exhibit high abrasion resistance and are preferably used in washing and cleaning agents.
Claims17
A method for the production of a granular sodium perborate tetrahydrate comprising:
- softening powdery perborate tetrahydrate by heating under pressure to form a plastically deformable mass, deforming the plastically deformable mass into thin strands by pressing, and comminuting said strands, wherein 0.3 to 5% by weight of a sodium salt or a potassium salt of a polymeric carboxylic acid are mixed into the powdery tetrahydrate before deforming, and wherein the carboxylic acid exhibits an acid value between 100 and 1000, as well as an average molecular weight between 4000 and 300,000.
A method of producing perborate monohydrate by means of dewatering perborate tetrahydrate, comprising:
- softening powdery perborate tetrahydrate by heating under pressure to form a plastically deformable mass, deforming the plastically deformable mass into thin strands by pressing, and comminuting said strands, wherein 0.3 to 5% by weight of a sodium salt or a potassium salt of a polymeric carboxylic acid is mixed into the powdery tetrahydrate before deforming, and wherein the carboxylic acid exhibits an acid value between 100 and 1000 and an average molecular weight between 4000 and 300,000, to thereby produce sodium perborate tetrahydrate;
- and
- dewatering the perborate tetrahydrate to thereby produce perborate monohydrate.
Dependencies are inferred from the claim text.