Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1989-10-24
1991-06-11
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 19, 162 301, 162 3011, 162 37, 162 47, 162 60, D21C 902, D21C 1100
Patent
active
050229621
ABSTRACT:
The invention concerns a method for the treatment of the spent liquors obtained from pulp production processes in the wood-processing industry, in which method the waste obtained from a chemical cooking process and that obtained from a mechanical process are merged for joint treatment. The chemical process may be e.g. a sulphate process and the mechanical process e.g. a chemi-thermomechanical process (CTMP), and the invention presupposes that the facilities for these processes are located close by each other, suitably within the same industrial complex. The essential feature of the invention is that the spent liquor of the CTMP is used as wash water in counter-current washing of the pulp obtained from the chemical process. The spent liquor can be used to replace part of the fresh water required for the washing of the chemical pulp, and the point at which the spent liquor is added to the process in the washing department is so chosen that the solids content of the wash water at said point has risen to essentially the same level with the solids content in the spent liquor to be fed in. The waste liquors obtained from the chemical and mechanical processes, merged as provided by the invention, are conveyed from the washing department into an evaporating plant and further to a burning station. The cooking chemicals contained in the green liquor obtained as a combustion residue are regenerated and used again.
REFERENCES:
patent: 3873412 (1975-03-01), Charters et al.
patent: 4060450 (1977-11-01), Palazzolo et al.
patent: 4073678 (1978-02-01), Hammond et al.
Korhonen Olli
Orivuori Juhani
Chin Peter
Enso-Gutzeit Oy
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