The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2002
Filed:
Jun. 16, 1999
Mitzi K. Fader, Jacksonville, FL (US);
Duy T. Nguyen, Jacksonville, FL (US);
Xiang Huai Wang, Alpharetta, GA (US);
Fushan Zhang, Jacksonville, FL (US);
Tien-Feng Ling, Alpharetta, GA (US);
Hercules Incorporated, Wilmington, DE (US);
Abstract
Method for inhibiting scale deposits in an aqueous system. The method may include adding anti-scalant to the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 500 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, and wherein the aqueous system has a pH of at least about 9. The method may include adding anti-scalant to the aqueous system such that an amount of anti-scalant in the aqueous system is up to about 500 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate, in the presence of up to about 0.4 ppm of cationic polymer. The method may include adding anti-scalant to the aqueous system at at least one of before a pulping digester and at a pulping digester, such that an amount of anti-scalant in the aqueous system is up to about 500 ppm, wherein the anti-scalant comprises at least one of polyvalent metal silicate and polyvalent metal carbonate. The method may involve adding a nucleation promoter/initiator to the aqueous system to inhibit formation of scale deposits, such that an amount of the nucleation promoter/initiator in the aqueous system is up to about 500 ppm. The method may involve adding first cations to the aqueous system and removing second cations which are distinct from the first cations from the aqueous system, to inhibit the second cations from forming scale deposits, wherein the aqueous system is at a temperature of about 70° C. to 500° C. Inorganic compositions therefor.