D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/153 (2006.01) B01D 53/18 (2006.01) B01J 19/24 (2006.01) C01B 13/11 (2006.01)
Patent
CA 2067844
ABSTRACT OF THE DISCLOSURE: There is disclosed a process and a plant for bleaching cellulosic materials using ozone. An ozonic gas is produced in an ozone generator by corona in air or oxygen. The ozonic gas is compressed and an aqueous solution enriched with oxygen (strong water) is recovered in an absorption vessel under pressure. The strong water is depressurized in a depressurizing zone, thus releasing a gas having a high O3 content (strong gas. The strong gas is diluted with an ozone-free or oxygen-poor gas. The gas obtained is mixed with the cellulosic materials to be bleached and is reacted in a bleaching zone. The material suspension bleached is degassed, the solid material is washed and processed.
Schwarzl Karl
Sinner Michael
Fetherstonhaugh & Co.
Voest-Alpine Industrieanlagenbau Gmbh
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