Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1998-07-09
2000-03-21
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 301, 162 33, 162 37, 162 65, D21C 9153, D21C 1100
Patent
active
06039837&
ABSTRACT:
When closing the process of manufacturing cellulose pulp of high brightness, i.e. including the recovery of essentially all waste liquor, there is an untenable enrichment of certain basic elements, such as sodium and sulphur. The present invention provides a partial solution to this problem and is concerned with a method in bleaching with ozone lignocellulosic material, e.g. cellulose pulp, which has been at least partially manufactured chemically, in the presence of water at a degre of acidity, expressed as pH, of 2-5. The method is characterized in that the acidity is maintained during the ozone bleaching process by adding a sulphuric acid solution or an acid sodium sulphate solution produced by electrolysis or electrodialysis of an essentially neutral sodium sulphate solution obtained by recycling chemicals in a system to which waste liquor from the ozone bleaching process is added.
REFERENCES:
patent: 3833462 (1974-09-01), Moy et al.
patent: 4080249 (1978-03-01), Kempf et al.
patent: 4450044 (1984-05-01), Fritzvold et al.
patent: 5034094 (1991-07-01), Kurple
patent: 5061343 (1991-10-01), Azarniouch et al.
Brannland Rolf C. A.
Noreus Sture E. O.
Alvo Steven
Mo och Domsjo Aktiebolag
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