Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1983-09-28
1985-12-31
Smith, William
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 3011, 162DIG8, D21C 1104
Patent
active
045619344
ABSTRACT:
The invention relates to a method of recovering chemicals from chloride-containing green liquor by precarbonating the green liquor by means of flue gases into hydrosulfide and soda, by removing hydrosulfide from the precarbonated solution in the form of hydrogen sulfide, by evaporation crystallizing the chloride- and soda-containing solution in order to separate the chloride salt from the alkaline solution. In order to reduce releases of hydrogen sulfide, the produced hydrogen sulfide is absorbed into a soda solution and/or an alkaline solution in order to produce a solution suitable for the preparation of white liquor, whereas the hydrogen sulfide which remains unabsorbed is returned to the precarbonation stage, in which the hydrogen sulfide is absorbed substantially completely. By means of the invention it is possible to achieve a closed cycle of chemicals without the chloride load of the system increasing, and at the same time the chloride is recovered and returned to the bleaching.
REFERENCES:
patent: 3508863 (1970-04-01), Kiminki et al.
patent: 3841961 (1974-10-01), Saiha
patent: 3841962 (1974-10-01), Proctor et al.
patent: 4093508 (1978-06-01), Henricson
patent: 4138312 (1979-02-01), Gill et al.
patent: 4187279 (1980-02-01), Rimpi
patent: 4253911 (1981-03-01), Hillstrom et al.
patent: 4288286 (1981-09-01), Fuller
Pulp & Paper Canada 85:2 1984, pp. 31-34.
OY Tampella AB
Smith William
LandOfFree
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