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Primary Examiner: Corbin, Arthur L.
Assistant Examiner:
Attorney: DeBenedictis; Nicholas J., Kane, Jr.; John W., Foley; William J.

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Title: Kraft pulp bleaching and recovery process

Abstract: A Kraft pulp bleaching process comprising from one to about three treatments with ozone and a final treatment with an alkaline peroxide solution, the treatments being separated by an alkaline extraction, wherein effluent from the bleach treatments is utilized in subsequent bleaching operations or in the chemical recovery system of a Kraft pulping process.

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Other info:

Inventors: Singh, Rudra P. (Ridley Park, PA, US)

Application Number: 516737
Filing Date: 1974-10-21
Publication_date: 1980-04-01
Assignee: Scott Paper Company (Philadelphia, PA)
Primary Class(es): 162/30.11 162/40, 162/65, 162/78, 162/90
Other Classes:
US Patent Ref:

1683262	Sep, 1928	Richter et al.	162/89.
1957937	May, 1934	Campbell et al.	162/19.
2147618	Feb, 1939	Rawling	162/65.
3366534	Jan, 1968	Rapson	162/30.
3382149	May, 1968	Hoh	162/65.
3451888	Jun, 1969	Ancelle et al.	162/65.
3453174	Jul, 1969	Rapson	162/30.
3632469	Jan, 1972	Wilder	162/60.
3740308	Jun, 1973	Rapson	162/30.
3798119	Mar, 1974	Singh	162/65.
3867246	Feb, 1975	Hebbel et al.	162/78.

Other Refs: Other References: Rydholm, Pulping Processes, 1965, p. 583.