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公开(公告)号：US20230313456A1
公开(公告)日：2023-10-05
申请号：US17996527
申请日：2021-03-17
Applicant: Messer Austria GmbH
Inventor： Bernhard Thaller
CPC classification number: D21C11/0057 , D21C9/147 , D21C3/222 , D21C3/026
Abstract: In a process for oxidation of white liquor, in particular of white liquor used in a process of production of paper or cellulose, the oxygen required for the oxidation is supplied to the reactor or the reactors in which the oxidation is carried out at least partially in the form of oxygen-containing nanobubbles. Due to the relatively long lifetime of the nanobubbles this very efficiently provides oxygen also for oxidation reactions in the white liquor proceeding at different rates.
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公开(公告)号：US20230203751A1
公开(公告)日：2023-06-29
申请号：US17996473
申请日：2021-03-17
Applicant: Messer Austria GmbH
Inventor： Bernhard Thaller
CPC classification number: D21C9/147 , D21C9/1036 , D21C9/163 , D21C9/1057
Abstract: In a process/an apparatus for producing bleached cellulose in which a lignin- and cellulose-containing suspension is subjected to at least one process step for oxygen-assisted bleaching in a reactor, such as alkaline oxygen delignification, oxygen-enhanced extraction or oxygen-enhanced peroxide bleaching, the oxygen required for the oxygen-assisted bleaching is supplied to the reactor at least partially in the form of oxygen-containing nanobubbles. The small size and high stability of the nanobubbles allow uniform distribution of the oxygen in the suspension and a comparatively long exposure time. The efficiency of the bleaching is thus substantially increased.
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