SCALE PREVENTION METHOD

PROBLEM TO BE SOLVED: To provide a scale prevention method that can effectively prevent scale in a boiler can, in a dust collection water system of a steel converter, or in a digester or in a black liquor-concentration step of pulp manufacturing, with a small amount of addition of an agent.SOLUTION:...

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Bibliographische Detailangaben
1. Verfasser:	OGASAWARA HIROTAKA
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY IMPREGNATING OR COATING OF PAPER METALLURGY PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS PULP COMPOSITIONS REGENERATION OF PULPING LIQUORS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a scale prevention method that can effectively prevent scale in a boiler can, in a dust collection water system of a steel converter, or in a digester or in a black liquor-concentration step of pulp manufacturing, with a small amount of addition of an agent.SOLUTION: A scale prevention method in pulp manufacturing comprises a step of adding a polymer having one carboxyl group selected from a copolymer of polyacrylic acid, polymaleic acid, acrylic acid, and maleic acid, a copolymer of acrylic acid, maleic acid, and vinyl acetate, and a copolymer of maleic acid and isobutylene, and a compound having a phosphono group to a water system under conditions of 50 to 250°C and pH≥9. The polymer having a carboxylic group and the compound having a phosphono group are added with a weight ratio of 0.4/0.6 to 0.8/0.2.