Process for causticizing green liquor in chemical recovery...

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

Reexamination Certificate

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C162S029000, C162S030100, C423SDIG030

Reexamination Certificate

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10503812

ABSTRACT:
The improved process is achieved by introducing depuration of green liquor and lime before causticization and two special causticization steps in causticization procedure of conventional chemical recovery processes. It not only avoids the generation of waste residue (lime mud) from the beginning and saves the re-burning and filling land of lime mud, but also can directly produce a series of precipitated calcium carbonate products with various particle sizes by regulating process conditions while alkali is recovered. The CaCO3products include CaCO3wherein ≧50% of CaCO3has a particle size below 2 μm, CaCO3wherein ≧90% of CaCO3have a particle size below 2 μm, and a superfine CaCO3having an average particle size <1 μm. The CaCO3obtained by this process can be directly used for papermaking and other industrial applications.

REFERENCES:
patent: 2560016 (1951-07-01), Walker
patent: 4397248 (1983-08-01), Mehta et al.
patent: 4941945 (1990-07-01), Pettersson
patent: 5628875 (1997-05-01), Liden et al.
patent: 6074521 (2000-06-01), Engdahl et al.
patent: 6627170 (2003-09-01), Takahashi et al.
patent: 1045567 (1990-09-01), None
patent: 1239166 (1999-12-01), None
Sven A. Rydholm, Pulping Processes, Sep. 1967, Interscience Publishers, pp. 777, 779, and 791-801.
Dialog File 351, Accession No. 13024195, Derwent WPI English language abstract for CN 1239166 A, Dec. 1999.
esp@canet English language abstract for CN 1045567 A, Sep. 1990.
International Search Report for International Application No. PCT/CN02/00290, Chinese Patent Office, China, mailed on Sep. 5, 2002.

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