Hydantoin-enhanced halogen efficacy in pulp and paper applications
US5565109A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1994 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Oct 14, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Free halogen sources (e.g., sodium hypochlorite and chlorine) added as slimicides in high organic component process streams such as pulp and paper processing are rendered more efficacious by the addition of selected N-hydrogen compounds (namely, 5,5-dimethylhydantoin, 5-ethyl-5-methylhydantoin, cyanuric acid, succinimide, urea, 4,4-dimethyl-2-oxazolidinone, and glycouril) to the process stream. The latter compounds may be added to the process stream before or after the slimicide is added or combined with the slimicide and added directly thereto. The direct use of halogenated hydantoins has also been found to provide improved efficacy relative to free halogen sources. In addition, absorbable organic halogen by-products are reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.