CS219685B1 - Biodispergator for the circulation cooling circuits - Google Patents

Description

The invention relates to a liquid dispersing detergent composition with a biocidal effect composed of surfactants, non-oxidising biocides and other functional additives intended for the control of mucilaginous bacteria as well as partially autotrophic nitrifying bacteria in both oxidation stages, algae and fungi in almost all industrial cooling water plants in the neutral but mainly alkaline region.

The construction of new plants of chemical, engineering and mainly energy character requires a constantly increasing consumption of water for cooling purposes. At the same time, the demand for circulating cooling water quality and the related treatment technology must address several problems:

1) Corrosion of refrigerant circuit materials and corrosion products in the circuit.

2) Inorganic increment deposition · in the circuit.

3) Settling of deposits of organic and inorganic origin in the make-up circuit.

4) Biological contamination of cooling water, possible contamination of the circuit by biological agglomerates.

The ultimate goal of a successful cooling water treatment program is to increase process and process efficiency and maximize equipment life. In addition to using effective corrosion inhibitors and dispersants to control corrosion by amineral deposition, there is a need for effective biocides to prevent contamination by organic substances. The solution of biofouling of circulating circuits is the object of the present invention.

Algae, bacteria and fungi enter the cooling system directly with additional water or are washed out of the air passing through the tower.

Biological activity in the circuit results in slime, which is formed as mud and sludge in the form of flakes, mainly including microorganisms. The flocculated microorganisms thus formed have sufficient adhesion, and by adhering to the heat exchanger surfaces on the heat exchanger interchangeable surfaces, the adhesion on the surface is increased. tackiness', which makes it easier to combine with corrosion products.

The root cause of the slime-related difficulties is the multiplication of bacteria in the refrigeration circulation system. Therefore, anti-slime measures prevent the growth of bacteria and various types of disinfectants are used for this purpose. The most commonly used are chlorine and its derivatives, more recently it is peroxyacetic acid and brominated propionates. These form a group of oxidizing biocides that irreversibly oxidize protein groups, resulting in the loss of normal enzyme activity.

The species group consists of non-oxidizing types of bioci219685 dov. These include: chlorinated phenol reagents, quaternary ammonium salts, amines, organotin and organosulfur compounds. The mechanism of multiplying these is by damaging the cell by reducing its permeability or by inhibiting the enzyme-substrate metabolite response.

The disadvantages of the mentioned substances are their relatively low efficiency ´ in the previous method of application, mainly from the biocidal point of view because of their narrow spectrum of antibacterial activity and also from the point of view of weaker prevention of flakes adhesion on heat exchange surfaces. For this reason, it is difficult to completely prevent the occurrence of slime with disinfectants alone.

These deficiencies are addressed by a biodisperser in aqueous cooling systems with a wide biocidal spectrum, while also having good effects on sporulating inoculurn, while ensuring the removal of microorganisms from the system so that they no longer serve as nutrient sources for other microorganisms. In the present invention, this is achieved by the synergistic effect of a small amount of expensive but high-performance biocide with other less expensive types, supplemented with a dispersant which promotes an effective concentration of the biocide throughout the system increasing the penetration of algae and bacterial slime layers.

The biodispersant according to the invention acts as a detergent on heat exchange surfaces with a broad biocidal spectrum in circulating cooling waters consisting of:

1) 10 to 50 wt. % of a two-component dispersant containing 70 to 95 wt. polyethoxylated propylene glycol ether of the general formula

H (C ₂ H ₄ O) _m (C ₃ H ₆ O) n (C ₂ H ₄ O) _p OH where m + p = 4 to 10, where m, p are the same or different integers n is 4 to 12 to 5 to 30 wt. alkyl polyglycol ether phosphate of general formula

II

R _x / OC ₂ H ₄ / _x -OPOZ OMe where Me is an alkali metal or amine having a carbon number of 1 to 6, preferably trienolamine Z is either identical to Me or represents a radical

- (C ₂ H ₄ O) _y - R ₂

R 1, R ₂ are either identical or different and represent alkyl or alkylphenol of 6 to 20 carbon atoms, preferably nonylphenol.

x, y are either identical or different integers ranging from 1 to 8.

2) 10 to 50 wt. a quaternary ammonium base and an alkyldimethylbenzylammonium chloride containing 8-10 carbon atoms.

3) 5 to 30 wt. isopropanol or ethyl alcohol.

4) 5 to 20 wt. bis (tributylcin) oxide.

5) from 5 to 15 wt. dodecyl.

6) from 0.5 to 5 wt. of the alkylated alkanolaminopolyglycol ether of the formula ^C 2 ^H 4 ^{O /} x ^H yc ₂ h ₄ 0 / _y H where x + y = 7

R = alkyl of 10 to 20 carbon atoms

Another advantage of the formulation is its good chemical stability and, above all, that its functionally functioning is best in the alkaline region.

The combination in the formulation of this type of preparation provides synergistic enhancements to improve stability and biocidal efficacy beyond the predicted activity of any individual component. Example 1

Biodispersing agent of 45 wt. of a two-component dispersion mixture of a polyethoxylated propylene glycol ether of the formula I with an alkyl glycol ether phosphate of the formula II in a ratio of 90% of I and 10% of II; % isopropyl alcohol (or ethyl alcohol), 40 wt. % of lauryldimethylbenzylammonium chloride and 10 wt. bis (tributylcin) oxide.

Example 2 wt. of a two-component dispersion mixture of the polyethoxylated propylene glycol ether of formula I and the alkyl polyglycol ether phosphate of formula II in a ratio of 90% of I and 10% of II; % lauryldimethylbenzylammonium chloride, 10 wt. % bis-tributylcin / -oxide, 20 wt. % isopropyl alcohol (or ethyl alcohol), 8.5 wt. % dodecylamine and 1.5 wt. alkylated alkanolamine polyglycol ether.

In the products obtained according to the formulations of Examples 1-2, a clear, leached to light brown liquid is obtained as a stable formulation with significant cleaning and wetting properties. Its main advantage is the high biocidal effect with a wide spectrum of heterotrophic microorganisms occurring in common circulating cooling waters and, in specific cases, at the same time inhibiting the activity of autotrophic nitrifying bacteria in both stages. Their evaluation is shown in Tables 1 to 3.

Table no. 1 Quantity of microorganisms in 1000/1

sample bacteria Mikromicéty 25 μΐ 50 μΐ 25 μΐ 50 μΐ 1. Inspection 270 128 Drew-214 114 96 84 70 3. Betz C-38-A 112 68 76 59 4. Ortosan MB 146 85 82 63 5. Sample 1 86 74 72 64 6. Sample 2 98 86 74 66

Table no. 2 Amount of nitrifying bacteria in 1000/1

sample Nitritačné Nitratačné 25 μΐ 50 μΐ 25 μΐ 50 μΐ 1. Inspection 23 12 2. Drew 214 12 11 8 6 3. Betz C-38-A 14 12 9 7 4. Ortosan MB 19 15 10 8 5. Sample 1 10 7 8 5 6. Sample 2 10 6 7 5

Table no. 3 Production of hydroxylamine, nitrite and nitrate at 50 μΐ

sample hydroxylamine nitrite nitrate 1. Inspection 100 100 100 2. Drew 214 82 42 32 3. Betz C-38-A 78 46 38 4. Ortosan MB 70 44 36 5. Sample 1 70 36 24 6. Sample 2 66 42 • 20

SUBJECT

INVENTION

Claims (2)

1) A detergent biodisperser acting on a wide biocidal spectrum heat exchanger wall in circulating cooling waters _{(characterized} in that it consists of 10 to 50% by weight of a two-component mixture of 70 to 95% by weight of a polyethoxylated propylene glycol ether of the formula H (C ₂ H ₄ O) _{n 1} (C ₃ H ₆ O) _n (C ₂ H ₄ O) _p OH where m + p = 4 to 10, where m, p are the same or different integers n is 4 to 12 to 5 to 30 wt. alkyl polyglycol ether phosphate of general formula II o-P-o-z I OMe kde Me is an alkali metal or amine having a carbon number of 1 to 6, preferably triethanolamine Z is either identical to Me or represents the - (C ₂ H ₄ O) _y - R ₂ radical R _{1 (} R ₂ are either identical or different and represent C 6 -C 20 alkyl or alkylphenol, preferably nonylphenol x, y are either identical or different from integers ranging from 1 to 8. 10 to 50 wt. quaternary ammonium base alkyldimethylbenzylammonium chloride containing 8 to 10 carbon atoms 5 to 30 wt. % isopropanol or ethyl alcohol; and 5 to 20 wt. bis (tributyltin) oxide 2) The biodispersant according to claim 1, further comprising 5 to 15 wt. % dodecylamine, 0.5 to 5 wt. of alkylated alkanolaminopolyglycol ether of general formula (o ₂ ^h 4o / _x h ^{) C} 2 ^H 4 ^{O /} y ^H where x + y = 7 R = alkyl having from 10 to 20 carbon atoms. Printed by Moravian Printing Works,