Process for removing anthraquinone type scale
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United States of America Patent
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Dec 31, 1985
Issued Date -
N/A
app pub date -
Jul 18, 1984
filing date -
Dec 1, 1980
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Expired
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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.
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