Title:
苛酷な系におけるスケールの抑制方法及びこれのための新規スケール防止剤
Document Type and Number:
Japanese Patent JP3897530
Kind Code:
B2
Abstract:
An improved process for inhibiting calcium carbonate scaling in aqueous systems such as that employed in the kraft process for the production of wood pulp. Such an improved process is achieved by the addition to the system of at least one antiscalant comprising at least one monomer unit derived from the group consisting of 1,2-dihydroxy-3-butene, N-(hydroxymethyl) acrylamide, and N-(sulfomethyl) acrylamide, and at least one monomer unit derived from the group consisting of maleic acid, acrylic acid, acrylamide, methacrylic acid, itaconic acid, vinyl sulfonic acid, styrene sulfonic acid, N-tertbutylacrylamide, butoxymethylacrylamide, N,N-dimethylacrylamide, sodium acrylamidomethyl propane sulfonic acid, and salts thereof, with the proviso that said polymers do not contain the monomer unit -(CH2-CH=CH-CH2-O)-.
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Inventors:
Doug Girara, Prasad, Yogendra
Maurice, John, David
Reed, peter, edward
Severtson, Stephen, John
Maurice, John, David
Reed, peter, edward
Severtson, Stephen, John
Application Number:
JP2000567477A
Publication Date:
March 28, 2007
Filing Date:
June 21, 1999
Export Citation:
Assignee:
NALCO CHEMICAL COMPANY
International Classes:
C02F5/10; C02F5/00; C08F212/14; C08F216/04; C08F220/06; C08F220/56; C08F222/02; C08F228/02; D21C3/22; D21C9/00; D21C11/10; D21H21/38
Domestic Patent References:
| JP62221499A | ||||
| JP4272985A |
Foreign References:
| GB776979A | ||||
| US4080375 | ||||
| US5441602 |
Attorney, Agent or Firm:
Yasuo Ishikawa