Process for removing anthraquinone type scale

Details Process for removing anthraquinone type scale Process for removing anthraquinone type scale

1981-11-19

1984-11-06

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

134 2213, 134 2217, 162 3011, 162 72, 162199, D21C 1110, C23G 114

Patent

active

044810733

ABSTRACT:
A process for removing an anthraquinone type scale comprises condensing a steam evaporated from a black liquor obtained by separating pulp from a digested mixture of lignocelluloses containing an anthraquinone type digesting assistant; and contacting a heated aqueous solution of a base in the presence or absence of a reducing agent or an alkali resistant surfactant with a wall of a condenser of an evaporator on which said anthraquinone type scale is adhered.

REFERENCES:
patent: 4178861 (1979-12-01), Vanderhoek et al.
patent: 4213821 (1980-07-01), Vanderhoek et al.
patent: 4263092 (1981-04-01), Klaessig et al.
Bloom et al., "Some Effects of Alkali on Corrosion of Mild Steel in Steam Generating Systems", Corrosion-National Association of Engineers, pp. 327-329, Sep. 1963, vol. 19.

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