Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1987-08-07
1988-09-13
Schor, Kenneth M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
423183, 423DIG3, 162 3011, D21C 1104
Patent
active
047707429
ABSTRACT:
A method for increasing the efficiency of the caustizing process which comprises: (a) adding to a green liquor between 78 and 82% of the stoichiometric amount of lime necessary to react with the amount of Na.sub.2 CO.sub.3 present in the green liquor to obtain a white liquor containing NaOH and lime mud. The white liquor is then clarified by extracting the lime mud present to obtain a white liquor having a total solid concentration of about 10-60 grams/liter. The supernatant liquid of the white liquor is treated with an additional amount of lime to increase the causticity to about 87%, then allowing further causticizing reaction between the lime and Na.sub.2 CO.sub.3. The remaining lime mud present is removed to obtain a white liquor which has the causticity of about 87%. One is thus able to raise the causticity of partially clarified white liquor following the normal causticizing process, the mud present being sufficient to increase causticity without substantially decreasing settling rate.
REFERENCES:
patent: 1815646 (1931-07-01), Bates et al.
patent: 2552183 (1951-05-01), Knight
patent: 4302281 (1981-11-01), Ryham
patent: 4536253 (1985-08-01), Bertelsen
patent: 4668342 (1987-05-01), Blackwell
Domtar Inc.
Gauvin Antoine H.
Hastings K. M.
Schor Kenneth M.
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