Production of polysaccharide-based polycarboxylates
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United States of America Patent
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Sep 28, 1999
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N/A
app pub date -
Mar 18, 1997
filing date -
May 26, 1993
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Expired
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Abstract
A continuous process for the production of polycarboxylic acids or salts thereof from polysaccharides involving contacting a polysaccharide with an oxidizing agent selected from the group consisting of nitrogen dioxide, dinitrogen tetroxide, or an equilibrium mixture thereof in the absence of oxygen at a temperature above 80 .degree.C. and at a pressure of from about 3 bar to about 15 bar absolute and for a tirne period of from about 1 to about 30 minutes to form a reducd gaseous product and a polysaccharide product wherein the primary alcohol groups of said polysaccharide product are at least partially converted to carboxyl groups.
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