Bleaching and delignifying cellulosic pulp using caroate/caro's acid solution
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United States of America Patent
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Jan 28, 2003
Grant Date -
Aug 29, 2002
app pub date -
Sep 21, 1999
filing date -
Mar 21, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method of bleaching and/or delignifying cellulose, in which (a) a sodium hydroxide solution and a peroxydisulphate solution are first of all produced by electrolysis of a sulphate, (b) the peroxydisulphate solution is converted by hydrolysis into a Caro's acid/caroate solution, (c) said Caro's acid/caroate solution is left to cool and (d) used immediately as a bleaching solution for bleaching and/or delignifying cellulose, the Caro's acid/caroate solution becoming neutralised upon introduction into the bleaching solution.
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