CZ2010856A3 - Antimicrobial formulation for conditioning cooling circuits - Google Patents

Abstract

An antimicrobial agent for the conditioning of refrigeration circuits, especially with low water content based on film-forming fatty amines, preferably octadecylamine, with the addition of quaternary ammonium salts, containing 9 to 11 wt. an aqueous emulsion of a film-forming fatty amine, preferably octadecylamine, which is metered in from 1 to 10 g per tonne of cooling water and a quaternary ammonium salt, for example, dimethylbenzyldodecylammonium bromide, in an amount of 1 to 5 g per tonne of cooling water and colloidal silver in 0.1 to 0.5 g per 1 ton of cooling water. Trace concentrations of colloidal silver will suppress particularly defiant biological organisms.

Description

Antimicrobial agent for conditioning cooling circuits.

Technical field.

Energy systems and a number of other technologies, eg in the food industry, petrochemicals, etc., have to cool their products, or, as in the energy sector, cooling systems are necessary to run and implement technological cycles, such as the Clausius-Rankin cycle. Cooling circuits, ranging from air conditioning units to power with several hundred megawat blocks, have cooling towers and cooling circuits representing tens of thousands of tons of water. Cooling towers with an aqueous environment, favorable temperature, enough air or oxygen in the cooling water, especially on the infill of the towers, represent suitable places to ·>

capture and growth of microbial substances. Higher organisms such as fungi, algae and fungi uncontrollable on cooling tower fillings increase, multiplying the weight of tower fillings, which often collapse under mass increase.

BACKGROUND OF THE INVENTION.

The activity of organic recovery and thus the increase of deposits on cooling tower fillings is evident with the beginning of spring and during the autumn. Chlorine-containing substances are most often used to suppress biological recovery. They are: chloramine, chlorine dioxide, hypochlorites and also chlorine itself. Although chlorination as an antimicrobial agent and the last step in combating biological recovery in cooling towers is very effective, it should be noted that it is not entirely suited to the concept of environmental protection, since cooling circuits are the release of concentrated cooling water in contact with the recipient.

WO 99/13715 A discloses a microorganism growth control composition comprising a synergistically effective amount of dodecyl morpholine or a salt thereof and dodecylamine or a salt thereof, which can be used as a protective impregnating agent but also to control the growth of microorganisms in cooling towers. It is clear from the document that antimicrobial refrigerant protection compositions are also known which contain an aqueous emulsion of film-forming fatty amines - specifically octadecylamine.

WO 01/93684 A discloses a method for inhibiting the growth of malignant algae, bacteria,

yeast and fungi in recirculating aqueous systems, which comprises adding an addition of a polymeric biguanide and an adjuvant of formula I, which may be an amine, preferably dodecylamine. It is further mentioned that another antimicrobial, such as a quaternary ammonium salt, can be added to the antimicrobial composition in the recycle system.

SUMMARY OF THE INVENTION.

The essence of the invention consists in conditioning the cooling circuit, especially with a low water content, by means which would suppress or completely eliminate biological recovery in the cooling circuits. This problem is solved by an antimicrobial composition based on film-forming fatty amines with addition of quaternary ammonium salts containing according to the invention 9 to 11 wt. an aqueous emulsion of film-forming fatty amines, preferably octadecylamine, which is dosed in an amount of 1 to 10 g per tonne of cooling water and a quaternary ammonium salt, for example> dimethylbenzyldodecylammonium bromide | in an amount of 1 to 5 g per 1 ton of cooling water and colloidal silver in an amount of 0.1 to 0.5 g per 1 ton of cooling water.

Trace concentrations of colloidal silver suppress particularly defiant biological organisms.

DETAILED DESCRIPTION OF THE INVENTION.

a) during the biological recovery of the cooling circuit of the 200 MW power plant, 10 grams of a 10% octadecylamine emulsion per tonne of feed water, respectively, was dosed in the summer and autumn months; per 1 ton of additional feed water. The bactericidal effect of octadecylamine showed a decrease in the order of 10 ⁶ after a weekly dosing of the composition and was maintained at a level of up to 50 Escherichia coli bacteria per ml.

(b) When the refrigeration circuit of the brewery refrigeration system is biologically activated, 5 grams of a 10% octadecylamine emulsion and 2 grams of a quaternary ammonium salt of the dimethylbenzyldodecylammonium bromide type are quenched into the cooling circuit of the outdoor sprinkler. The effect became apparent after several days

The dosage of the composition.

(c) for the biological recovery of the air-conditioning unit cooling circuit, a composition comprising: 2 g octadecylamine 10% emulsion, 1 g quaternary ammonium salt of cetylpyridinium chloride type and 0,5 g colloidal silver per 1 ton of cooling water was applied to the cooling water. Prior to application, the cooling water contained 2.0. 10 ⁶ Escherichia coli bacteria per ml. After 25 hrs. At 3 tons ^(D C was found less than 50 Escherichia coli bacteria in 1 ml. A bactericidal effect is expressed within several hours.

Industrial use of the invention.

The antimicrobial refrigerant conditioning agent has a wide application for any, especially open, refrigerant circuit. It will prevent accidents of circulation and filling of the cooling tower and will contribute to the trouble-free operation of the equipment.

Claims (3)

Patent claims. What is claimed is: 1. An antimicrobial agent for conditioning cooling circuits, in particular of a low water content, based on film-forming fatty amines with the addition of [gamma] quaternary ammonium salts, characterized in that it contains 9 to 11 wt. an aqueous emulsion of film-forming fatty amines, preferably octadecytemine which is dosed in an amount of 1 to 10 g per 1 ton of cooling water and quaternary ammonium salt in an amount of 1 to 5 g per 1 ton of cooling water and colloidal silver in an amount of 0.1 to 0.5 g per 1 ton of cooling water. Antimicrobial composition according to claim 1, characterized in that the amine is octadecylamine. Third antimicrobial composition according to claim 1 and _Z 2, characterized in that the quaternary ammonium salt is a bromide dimetylbenzyldodecylamonium.