Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1978-08-30
1980-07-15
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
423207, 423512A, 423DIG3, D21C 1102
Patent
active
042127025
ABSTRACT:
A process for recovery of chemicals from a sodium sulfite pulping waste liquor is disclosed in which a smelt obtained from the waste liquor is introduced into an aqueous slurry containing solidified smelt while make up water and a weak aqueous slurry are supplied to effect incomplete dissolution of the smelt into the aqueous slurry to maintain the content of total solid and the temperature of the slurry at constant levels, the resulting aqueous slurry is subjected to a solid-liquid separation to obtain a wet cake having the molar ratio of S/Na.sub.2 O substantially equal to that of the smelt, the wet cake is mixed with hot particles of sodium carbonate and sodium sulfite while hot air is supplied to effect oxidation of sodium sulfide in the wet cake to sodium sulfite and then the oxidized product is dissolved in aqueous medium and sulfur dioxide-containing gas, preferably the exhaust gas from the recovery boiler, is contacted with the resulting aqueous solution to convert sodium carbonate into sodium sulfite, whereby the overall process is carried out in a closed system and the sulfur component and the sodium component present in the waste cooking liquor are recovered and regenerated into a cooking liquor.
REFERENCES:
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patent: 4141785 (1979-02-01), Mizuguchi et al.
Handbook of Pulp and Paper Technology, Britt, p. 195, 1964.
Mizuguchi Saburo
Naito Takeyuki
Nomura Isao
Onodera Masato
Saito Kouji
Bashore S. Leon
Ebara Manufacturing Company, Limited
Kratz Peter F.
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