Methods of preventing scaling involving inorganic compositions, and inorganic compositions therefor
US6355214B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1999 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Jun 16, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/06
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.