Liquid purification or separation – Processes – Chemical treatment
Patent
1997-07-29
2000-08-15
Hruskoci, Peter A.
Liquid purification or separation
Processes
Chemical treatment
134 2219, 162161, 504155, 504158, 514211, 514218, 5142288, 5142312, 514247, 514277, 514315, 514359, 514601, C02F 150
Patent
active
061031313
ABSTRACT:
The invention relates to a method to inhibit bacteria from adhering to a submergible surface. The method contacts the submergible surface with an effective amount of at least one sulfamic acid or salt thereof to inhibit bacterial adhesion to the submergible surface. The invention also relates to a method for controlling biofouling of an aqueous system. This method adds an effective amount of at least one sulfamic acid or salt thereof to inhibit bacteria from adhering to a submerged surface within the aqueous system. This method effectively controls biofouling without substantially killing the fouling organisms. The sulfamic acid used in the method of the invention has the formula R.sup.1 R.sup.2 NS(O).sub.2 (OH). In this formula, R.sup.1 and R.sup.2 are independently a hydrogen, a C.sub.4 -C.sub.20 alkyl group or a cyclohexyl group. However, R.sup.1 and R.sup.2 are not both hydrogen. Alternatively, R.sup.1 and R.sup.2, together with the N, may also form a 5-8 membered heterocyclic ring having the formula: ##STR1## In the heterocyclic ring, X is O, NH, or CH.sub.2. The salt of sulfamic acid can be an acid salt or quaternized sulfamic acid salt. The present invention also relates to a composition containing sulfamic acids or salts thereof useable in the above methods. The compositions comprise at least one sulfamic acid or salt thereof in an amount effective to inhibit bacteria from adhering to submergible or submerged surfaces.
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Bryant Stephen D.
McNeel Thomas E.
Vunk Graciela H.
Whittemore Marilyn S.
Buckman Laboratories International Inc.
Hruskoci Peter A.
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