Fluidized-bed oxidation process for the production of polysaccharide-based polycarboxylates
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United States of America Patent
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Oct 13, 1998
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N/A
app pub date -
Jul 31, 1996
filing date -
Jan 31, 1994
priority date (Note) -
Expired
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Abstract
A process for producing polycarboxylic acids or their salts from polysaccharides is provided. Solid particulate polysaccharides having at least one primary alcohol group in the polysaccharides are oxidized with nitrogen dioxide in a fluid bed. The fluidizing gas contains nitrogen dioxide and the process is operated at a pressure of from 0.5 to 12 bars and a temperature between the boiling point of nitrogen dioxide and 160.degree. C. At least two moles of nitrogen dioxide for the equivalent of the primary alcohol groups reacted over the entire reaction are provided.
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