Polyacrylic acids and methyl vinyl ether/maleic anhydride copolymers as soft scale inhibitors
AssigneeBetz Laboratories, Inc.
InventorsFrederick C. Klaessig, Donald F. Jacques
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Abstract
A method is disclosed for inhibiting soft scale precipitation in black liquor systems by adding thereto a treatment comprising in combination polyacrylic acid and methyl vinyl ether/maleic anhydride copolymer.
Claims12
A method for inhibiting the precipitation of soft scale from black liquor, which method comprises adding to said black liquor an effective amount for the purpose of a treatment comprising in combination effective polyacrylic acid and effective methyl vinyl ether/maleic anhydride copolymer, wherein said treatment is added in an amount of from about 1 to about 500 parts per million parts of black liquor.
A method for inhibiting the precipitation of soft scale from black liquor in a multiple-effect evaporator, which method comprises adding to said black liquor an effective amount for the purpose of a treatment comprising in combination effective polyacrylic acid and effective methyl vinyl ether/maleic anhydride copolymer, wherein said treatment is added in an amount of from about 1 to about 500 parts per million parts of black liquor and wherein said soft scale comprises burkeite.
Dependencies are inferred from the claim text.