Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1996-08-05
1997-12-09
Straub, Gary P.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 51, 423219, 423220, 423DIG3, D21C 9153, B01D 5366
Patent
active
056956045
ABSTRACT:
A method for reprocessing an ozone-containing gas present in a pulp bleaching plant comprising the steps of supplying the ozone-containing gas to a scrubber and reducing the ozone concentration of the gas as the gas flows through the scrubber. The step of reducing comprises the steps of supplying an alkaline medium to the scrubber and flowing the ozone-containing gas in countercurrent relationship with the alkaline medium within the scrubber so as to provide intimate contact between the ozone-containing gas and the alkaline medium, thereby converting the ozone-containing gas into a substantially ozone-free gas. The alkaline medium may comprise one of the following: a sodium hydroxide solution; white liquor; post oxygen stage filtrate; weak black liquor; or filtrate from an Eo stage of the pulp bleaching plant. The method further comprises the step of separately discharging the ozone-containing gas and the alkaline medium from the scrubber. The ozone-containing gas may comprise an off-gas, which has been partially reacted with a pulp within a pulp bleaching stage or alternatively may comprise fresh bleaching gas, having an ozone concentration ranging from about 6% to about 14% by weight within a carrier gas, with the fresh bleaching gas being supplied directly from an ozone generator to the scrubber.
REFERENCES:
patent: 2830870 (1958-04-01), Limerick
patent: 4287130 (1981-09-01), Dohm et al.
patent: 4399292 (1983-08-01), Rossi et al.
Minami Shusuke
Rounsaville Jeffrey
Beloit Technologies Inc.
Straub Gary P.
Vanoy Timothy C.
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