Process for separating lignins and dissolved organic compounds f

Details Process for separating lignins and dissolved organic compounds f Process for separating lignins and dissolved organic compounds f

1993-08-20

1997-06-03

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 29, 210705, 210724, 210725, 210928, D21C 1100

Patent

active

056350244

ABSTRACT:
Digestion liquor is used in the paper pulping process to dissolve lignins and free the cellulose fiber from raw wood chips. After pulping, spent digestion liquor is laden with lignins. Heretofore, it was known that lignins could be coagulated by acidification of the digestion liquor, but such method coagulated the lignins in a slimy gelatinous mass that was difficult to separate from the liquor. It has been discovered that the addition of water soluble, surface active, polymeric agents to the digestion liquor prior to acidification, results in an easily separable lignin coagulant after acidification.

REFERENCES:
patent: 3546200 (1970-12-01), Whalem et al.
patent: 3935121 (1976-01-01), Lieberman et al.
patent: 4107073 (1978-08-01), Maciaszek
patent: 4230599 (1980-10-01), Elfers
patent: 4561934 (1985-12-01), Rimpi
patent: 4921613 (1990-05-01), Nordberg
patent: 4950420 (1990-08-01), Svarz

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