Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1976-12-15
1979-01-16
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 29, 210 28, 210 40, 210 45, 210 54, 210 66, 210 67, 210 70, 210 73R, D21C 1100
Patent
active
041347862
ABSTRACT:
A method and means for purifying the waste water from paper and pulp mill wastes obtained from a mill using the Kraft process by first precipitating lignins and lignin derivatives from the waste stream with quaternary ammonium compounds, removing other impurities by activated carbon produced from the cellulosic components of the water, and thereafter separating water from the precipitate and solids. The activated carbon also acts as an aid to the separation of the water and solids. If recovery of lignins is also desired, then the precipitate containing the lignins and quaternary ammonium compound is dissolved in methanol. Upon acidification, the lignin is precipitated from the solution. The methanol and quaternary ammonium compound are recovered for reuse from the remainder.
REFERENCES:
patent: 2850492 (1958-09-01), Erskine et al.
patent: 4008161 (1977-02-01), Wong et al.
Fletcher James C. Administrator of the National Aeronautics and Space
Humphrey Marshall F.
Fisher Richard V.
Grifka Wilfred
Manning John R.
Mott Monte F.
Smith William F.
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