CZ302960B6 - Antimicrobial formulation for conditioning cooling circuits - Google Patents

Abstract

In the present invention, there is disclosed an antimicrobial formulation for conditioning cooling circuits especially with a small water volume, the formulation being based on film-forming fatty amines, preferably octadecylamine with the addition of quaternary ammonium salts, The formulation of the present invention contains 9 to 11 percent by weight of water emulsion of the film-forming fatty amines, preferably octadecylamine being proportioned in an amount of 1 to 10 g per 1 ton of cooling water and quaternary ammonium salt, such as dimethyl benzyldodecyl ammonium 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 concentration values of the colloidal silver suppress even most vicious biological organisms.

Description

Technical field

Energy equipment and many other technologies, eg in the food industry, petrochemistry, etc., have to cool their products, or, as in the energy sector, cooling systems are necessary for the operation and implementation of technological cycles, such as Clausius-Rankin's cycle. Cooling circuits, from air-conditioning units to power systems with several hundred megawat blocks, have cooling towers and cooling circuits representing tens of thousands of tons of water. Cooling towers with aqueous environment, favorable temperature, enough air, respectively. of oxygen in the cooling water, especially on the infill of the towers, are suitable places for the attachment and growth of substances of a microbial nature. Higher organisms such as fungi, algae and fungi grow uncontrollably on the cooling tower fillings, increasing the weight of the tower fillings which often collapse under the mass increase.

BACKGROUND OF THE INVENTION

The activity of organic recovery and thus increased deposition 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 describes a microorganism growth control composition comprising a synergistically effective amount of dodecyl morpholine or its salts and dodecyl amine or its salts, which can be used as a protective impregnating agent, but also to control the growth of microorganisms 30 in cooling towers. It is clear from the document that antimicrobial compositions for cooling circuit protection are also known which contain an aqueous emulsion of film-forming fatty amines - in particular, octadecs of laminate.

WO 01/93684 A discloses a method for inhibiting the growth of malignant algae, bacteria, yeasts and fungi in recirculating aqueous systems, comprising adding a polymeric biguanide and an adjuvant of formula I, which may be an amine, preferably dodecylamine. It is further mentioned that another antimicrobial, for example a quaternary ammonium salt, may be added to the antimicrobial composition in the recycling system.

SUMMARY OF THE INVENTION

The essence of the invention consists in conditioning the cooling circuit, especially with a low water content, by means that 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 the addition of quaternary ammonium salts, containing according to the invention 9 to 11 wt. aqueous emulsions of film-forming fatty amines, preferably octadecylamine, which are dosed in an amount of 1 to 10 g per 1 ton of cooling water and a quaternary ammonium salt, for example dimethylbenzyldodecylammonium bromide, in an amount of 1 to 5 g per ton 0.1 to 0.5 g per

1 ton of cooling water.

Trace concentrations of colloidal silver suppress particularly defiant biological organisms.

-1 CZ 302960 B6

DETAILED DESCRIPTION OF THE INVENTION

a) during the biological revival 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 following 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 quaternary ammonium salt of dimethylbenzyldodecylammonium bromide type are added to the refrigeration circuit of the outdoor sprinkler. The effect became apparent after several days of dosing.

(c) for the biological recovery of the air-conditioning unit cooling circuit, a composition of 2 g octadecylamine 10% emulsion, 1 gram of quaternary ammonium salt of cetylpyridinium chloride type and 0,5 gram of colloidal silver per tonne of cooling water has been applied to the cooling water. Prior to application, the cooling water contained 2.0. 10 ⁶ Escherichia coli bacteria per ml. Less than 50 Escherichia coli bacteria per ml were found after 25 hours at 37 ° C. The bactericidal effect manifested itself within a few 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 quaternary ammonium salts, characterized in that it contains 9 to 11 wt. an aqueous emulsion of film-forming fatty amines which is dosed in an amount of 1 to 10 g per 1 ton of cooling water and a quaternary ammonium salt 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. The antimicrobial composition of claim 1, wherein the fatty amine is octadecy lamin. An antimicrobial composition according to claims 1 to 2, wherein the quaternary ammonium salt is dimethylbenzyldodecylammonium bromide.