Hydantoin-enhanced halogen efficacy in pulp and paper applicatio

Details Hydantoin-enhanced halogen efficacy in pulp and paper applicatio Hydantoin-enhanced halogen efficacy in pulp and paper applicatio

1994-10-14

1996-10-15

Hruskoci, Peter A.

Liquid purification or separation

Processes

Chemical treatment

210754, 210764, 210756, 162161, C02F 150

Patent

active

055651097

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.

REFERENCES:
patent: 3328294 (1967-06-01), Self et al.
patent: 3749672 (1973-07-01), Golton et al.
patent: 4297224 (1981-10-01), Macchiarolo et al.
patent: 4427692 (1984-01-01), Girard
patent: 4537697 (1985-08-01), Girard
patent: 4698165 (1987-10-01), Theyson
patent: 4925866 (1990-05-01), Smith

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