C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
C23F 14/00 (2006.01) B01D 3/34 (2006.01) C02F 5/12 (2006.01) D21C 11/10 (2006.01)
Patent
CA 2182261
Described is a method for inhibiting incrustations in evaporators for concentrating black liquor from the sulphite process comprising the addition of a copolymer of acrylic acid, 2- acrylamido-2-methylpropane-1-sulfonate and t-butylacrylamide and/or a hydrophobically modified (meth)acrylate polymer in combination with an anionic surfactant selected from n-alkyl benzene sulfonic acids. This combination exhibits a distinct synergistic effect and inhibits the formation of incrustations considerably. Described is further a corresponding agent comprising these copolymers and an anionic surfactant.
Schankula Herold
Schuetz Jurgen Friedrich
Betzdearborn Inc.
Gowling Lafleur Henderson Llp
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