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US 5,441,602 AGranted
Process for the prevention of scale formation in wood pulp production
AssigneeFMC Corporation
InventorsArthur Harris, John Burrows, David Wilson
Life of this patent
Estimating the term…
Abstract
Hydrolyzed copolymers of (A) maleic anhydride with (B) at least one mono-ethylenically unsaturated monomer other than acrylic acid or methacrylic acid or with a mixture of (B) and (C) acrylic acid or methacrylic acid are effective for inhibiting the formation of calcium carbonate scale in wood pulp production.
Claims23
An improved process for inhibiting the formation of calcium carbonate scale in wood pulp production wherein the improvement comprises.
- adding to a white liquor used to extract lignin from wood 1-100 ppm of a hydrolysed copolymer of (A) maleic anhydride with (B) at least one mono-ethylenically unsaturated monomer other than acrylic acid or methacrylic acid, or with a mixture of (B) and (C) acrylic acid or methacrylic acid.
Dependencies are inferred from the claim text.