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US 12,410,557 B2Granted
Process and apparatus for white liquor oxidation
AssigneeMesser Austria GmbH
InventorBernhard Thaller
Life of this patent
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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.
Claims14
A process for oxidizing white liquor, the process comprising:
- contacting unoxidized white liquor with oxygen in a first reactor to partially oxidize the white liquor, thereby partially oxidizing sulfur compounds in the white liquor;
- feeding the partially oxidized white liquor from the first reactor to a second reactor;
- and
- contacting the partially oxidized white liquor with oxygen in the second reactor to fully oxidize the white liquor, thereby fully oxidizing sulfur in the partially oxidized white liquor;
- wherein nanobubbles containing the oxygen required for the oxidation are fed into the unoxidized white liquor via a first introduction device located in a feed line for supplying the unoxidized white liquor to the first reactor and via a second introduction device located in the first reactor.
2 more elements
An apparatus for oxidizing white liquor, the apparatus comprising:
- a first reactor in which unoxidized white liquor is contacted with oxygen to partially oxidize the white liquor, thereby partially oxidizing sulfur compounds in the white liquor;
- a second reactor in which the partially oxidized white liquor is contacted with oxygen to fully oxidize the white liquor, thereby fully oxidizing sulfur in the partially oxidized white liquor;
- a feed line for conveying the partially oxidized white liquor from the first reactor into the second reactor;
- and
- a plurality of introduction devices for introducing oxygen in the form of nanobubbles, the plurality of introduction devices comprising a first introduction device located in a feed line for supplying the unoxidized white liquor to the first reactor and comprising a second introduction device located in the first reactor.
2 more elements
Dependencies are inferred from the claim text.