Scale inhibition formulations for kraft digesters
US4799995A · kind A · utility
12Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1987 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Jul 29, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F5/14
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Inhibition of calcium scale under the extreme temperature conditions found in pulp digesters has been accomplished by employing certain mixtures of polaminopoly(alkylenephosphonic acids) together with nonionic surfactants. Diethylenetriaminepenta(methylenephosphonic acid) together with a polyethoxynonylphenol has been found especially effective for the purpose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.