Method for controlling the viscosity of Kraft black liquor

Details Method for controlling the viscosity of Kraft black liquor Method for controlling the viscosity of Kraft black liquor

1993-09-07

1995-12-05

Lacey, David L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 29, 162 41, 162 65, D21C 1104

Patent

active

054725682

ABSTRACT:
An improved method of chemical recovery from kraft black liquor is disclosed in which the heat generated by controlled oxidation of the liquor is utilized to reduce the viscosity and net heating value of the liquor which allows the firing of a more concentrated liquor in the recovery boiler. Net steam recovery is increased for a given black liquor feed rate. Alternatively, the firing of liquor having a higher solids concentration is possible, which increases the throughput of the recovery boiler.

REFERENCES:
patent: 4239589 (1980-12-01), Elton et al.
patent: 4313788 (1982-02-01), Gulley
patent: 4718978 (1988-01-01), Spannuth et al.
patent: 4929307 (1990-05-01), Kiiskila et al.
patent: 4953607 (1990-09-01), Erkki
Rolf Ryham, "High Solids Evaporation Through Thermal Depol. of Black Liquor", 1989 Chem Rec.; pp. 157-160.
John R. Lavigne, "An Introduction to Paper Industry Instrumentation", 1977, pp. 198-199, 302-305.
Small, Jr. J. D. et al; "Thermal Stability of Kraft Black Liquor Viscosity at Elevated Temperatures"; Ind. Eng. Chem Prod. RPS Div.; 1985, 24, 608-614.
Hermans, et al; "The Effect of Oxidation on Black Liquor Composition and Properties" 1984 Pulping Cont; pp. 575-578.

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