Title: Process for purification of waste water produced by a Kraft process pulp and paper mill

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.

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Inventors: Fletcher, James C. Administrator of the National Aeronautics and Space (Duarte, CA, US)
Humphrey, Marshall F. (Duarte, CA, US)

Application Number: 750798
Filing Date: 1976-12-15
Publication_date: 1979-01-16
Assignee:
Primary Class(es): 162/14 162/29, 210/666, 210/694
Other Classes:
US Patent Ref:

2850492	Sep, 1958	Erskine et al.	260/124.
4008161	Feb, 1977	Wong et al.	162/29.

Other Refs: 589807

Dec, 1959	CA

Primary Examiner: Fisher, Richard V.
Assistant Examiner: Smith, William F.
Attorney: Mott; Monte F., Manning; John R., Grifka; Wilfred