CS260923B1 - Acid cleanser and disinfectant - Google Patents

Abstract

The acidic cleaning and disinfecting agent contains 7.5 to 50% by weight of phosphoric acid, 10 to 60% by weight of arenesulfonic acid, for example benzenesulfonic or p-toluenesulfonic, 0.5 to 5% by weight of surfactant and 0.3 to 5% by weight of defoamer, or 1 to 15% by weight of concentrated sulfuric acid in aqueous solution. This agent may further contain 0.005 to 0.1% by weight of anti-corrosion additive and 2 to 10% by weight of peroxyacid. The preparation is suitable for cleaning and disinfecting equipment for primary milk production and dairy plants.

Description

The invention relates to an acidic liquid cleaning and disinfecting agent for combined cleaning and disinfection of containers, machine parts and equipment for primary milk production and dairy processing plants. Currently, there is a wide range of cleaning, disinfecting and combined preparations /L. Kratochvíl: Dairy Industry, supplement to the magazine Náš chov 9/85-1; S. Hrubý et al.: Microbiology in Nutritional Hygiene, Avicenum, Prague 1984/. As acidic cleaning and disinfecting agents, technical nitric acid is used, optionally with the content of surfactants and other substances.

Some of the acidic preparations available on the market are highly aggressive (e.g. nitric acid, technical grade), others contain expensive and scarce chemicals. Another disadvantage is the negative impact on the environment, problems with the treatment of wastewater from used cleaning and disinfection baths and from rinsing water.

The above disadvantages are eliminated by the composition according to the invention, which contains 7.5 to 50% by weight of phosphoric acid, 10 to 60% by weight of arenesulfonic acid, for example benzenesulfonic or p-toluenesulfonic, 0.5 to 5% by weight of surfactant and 0.3 to 5% by weight of defoamer, or 1 to 15% by weight of concentrated sulfuric acid in aqueous solution. This composition preferably contains surfactants based on ethylene-oxidized amines with 8 to 18 carbon atoms, ethylene-oxidized alcohols with 8 to 18 carbon atoms, ethylene-oxidized phenols, alkylbenzene sulfonated acids or mixtures thereof.

It is preferable to use a defoamer based on polysiloxanes or alkylbenzenes. It may also contain 0.005 to 0.1 wt. % of an anticorrosive additive and 2 to 10 wt. % of peroxyacids.

The acidic cleaning and disinfecting agent according to the invention facilitates cleaning by dissolving, emulsifying or suspending fats, proteins and minerals, especially those containing calcium or magnesium ions.

The combined agent is formulated from acidic components, arenesulfonic acid, phosphoric acid, sulfuric acid, as well as surfactants and defoamers. Arenesulfonic acids benzenesulfonic, p-toluenesulfonic, serve to neutralize alkaline impurities, dissolve mineral deposits, especially calcium, magnesium and iron salts, while at the same time destroying the vast majority of microorganisms with high acidity. Phosphoric acid serves to dissolve mineral substances and as a corrosion inhibitor, partial replacement of phosphoric acid with sulfuric acid allows for a reduction in the price of the commercial product.

Ethylene-oxidized amines and alcohols or phenols simultaneously act as corrosion inhibitors of non-ferrous metals and rubber joints and assist in the formation and stability of dispersions formed by solid particles.

The content of 0.005 to 0.1% by weight of an anti-corrosion additive such as dibenzyl sulfoxide extends the safety of equipment operation and its long-term durability.

The acidic combined cleaning and disinfecting agent is composed of easily available and inexpensive raw materials, and has high cleaning and disinfecting efficiency. Low foaming makes cleaning and disinfection work easier, especially for machinery.

The effectiveness of the preparation according to the invention is significantly increased by periodic alternation with an alkaline cleaning and disinfecting preparation.

The combined agent according to the invention is diluted with safe water, preferably demineralized water, before use in a ratio of 0.25 l of the agent to 75 to 125 l of water, preferably 0.25 l to 100 l of water. Cleaning and disinfection are carried out at a temperature of 45 to 55 °C for 10 to 20 minutes. After the operation is completed, the solution is drained and the device is rinsed with cold water.

The following specific examples provide formulations of acidic cleaning and disinfecting compositions, which do not limit the scope of the invention in any way.

Example 1

Acidic cleaning and disinfectant % wt. 75% phosphoric acid 10% wt. p-toluenesulfonic acid % wt. 75% sulfuric acid % wt. alkylarylsulfonic acid % wt. ethyleneoxidized amine with 8 to 18 C atoms and 5 to 20 ethylene oxide units 1.5% wt. polysiloxane % wt. Persteril

27.5% by weight water

Example 2%

Acidic cleaning and disinfectant % wt. 75% phosphoric acid 30% wt. p-foluenesulfonic acid 20% wt. C^2 ^{-1:ienzensul ronic} acid % wt. ethyleneoxidized amine C _o with 5 to 20 ethylene oxide units

O 32 1 o % wt. ethylene oxide acid up to 18 ^{with 2 10} ethylene oxide units % wt. polysiloxane

0.05% by weight dibenzyl sulfoxide 35.95% by weight water

Example 3

Acidic cleaning and disinfectant % wt. 75% phosphoric acid 5% wt. p-toluenesulfonic acid % wt. C^2 ^- benzenesulfonic acid % wt. 75% sulfuric acid 5% wt. sodium persulfate

1.5 wt. % of ethylene oxide amine C _a . _lo with 5 to 20 ethylene oxide units of 3Z lo

1.5% by weight of ethylene oxide acid C,,. ₁₀ with 2 to 20 ethylene oxide units

3Z lo wt. % polysiloxane

0.5% by weight dibenzyl sulfoxide % by weight water

The advantage of the newly formulated product according to the invention was demonstrated based on comparisons with existing products in both laboratory and operational conditions. The evaluation of the products used a methodology approved by the Central Administration of Veterinary Institutes (OsvO).

Prague, for verifying the effectiveness of cleaning and disinfecting agents in the sanitation of machinery in agricultural and food production facilities. The effectiveness was assessed by the plate diffusion method /the size of the attenuation zone from the edge of the applied agent to the beginning of germ growth was assessed/. At the same time, determinations from operational experiments /stable conditions/ were carried out on DZ 100 type machinery for a period of 4 weeks. The effectiveness was examined by the rinsing method and the number of germs was determined before and after cleaning and disinfection. The effectiveness of the individual agents used is expressed in % of germ loss /see Table 1/. The assessment of the presence of coliform germs /fecal contamination/ is assessed from the number of samples. The values found are given in Table 1.

Table 2 shows the tissue toxicity (values 1 to 4), the pH changes of the product after 60 days of storage under operational stable conditions and the corrosion to various materials (wood, rubber, brick, concrete, iron, aluminum, paints). In the stable experiment, no residues were found in milk, and the wastewater after 10-fold dilution is also non-toxic to commonly used test strains of protozoa.

Table 1

Comparison of the effectiveness of cleaning and disinfectants

Resource name % of working solution used % germ loss in milk after disinfection number of microorganisms in milk after disinfection of equipment number of samples with coliform bacteria in milk after disinfection of the equipment out of a total of 4 samples disinfection efficiency according to the plate method and/ b/ Alkaline agent 0.5 97.8 1,325 0 3 Acidic agent example 1 0.25 Acidic agent example 1 0.25 33.2 187 170 3 - Acidic agent example 2 0.25 31.6 192,620 3 - Acidic agent example 3 0.25 41.3 124,670 2 - Demyro A Demyro K 0.5 0.5 97.8 3,426 2 3 Demyro K 0.5 48.2 110 270 2 4 Agrosan A Agrosan K 1.0 0.25 95.75 2'650 1 2 fort Agrosan K forte 0.25 ' 38.6 237,850 2 3

Explanations to table 1 a/ - determined from four samples, 0 means they were not present, 1 means that out of four samples there was a positive finding in one sample b/ - the assessment is expressed by the relative size of the attenuation zone after application of the product

Composition of individual preparations

Alkaline agent containing alkali metal hydroxide, alkali metal polyphosphate, and a compound with active chlorine.

Demyro A - composition sodium hypochlorite, sodium hydroxide, pentasodium triphosphate, hydrogen peroxide, etoxone EPA

Demyro K - phosphoric acid

Agrosan A - composition alkaline agent with active chlorine

Agrosan K forte - phosphoric and sulfuric acid

Milkon - not available

Alkon Z-4 - sodium metasilicate, trisodium phosphate, chloramine and wetting agents

Table »1 to 2

Selected characteristics of the tested preparations

Means Tissue toxicity % pH change Corrosive properties Acidic composition according to the invention 2 0 8 Demyro K 3 30 14 Agrosan K 2 16 12 Milkon 2 - 11 Alkon Z-4 2 - 8

In the stable experiment, no residues were found in the milk, and the wastewater after 10-fold dilution is also non-toxic to commonly used test strains of protozoa.

Claims (5)

An acidic cleaning and disinfectant composition based on organic and inorganic acids and surfactants, characterized in that it contains from 7.5 to 50% by weight of water. phosphoric acid, 10 to 60% hmbt. % arenesulfonic acids, for example benzenesulfonic or p-toluenesulfonic acids, 0.5 to 5 wt. % surfactant based on C8-C18 ethylene oxidized amines, C8-C18 ethylene oxide alcohols, alkylbenzene sulfonic acid ethylene oxide phenols or mixtures thereof, 0.3 to 5 wt. defoamers and the remainder up to 100 wt. water. 2. A composition according to claim 1 comprising from about 1 to about 15 wt. concentrated sulfuric acid. 3. A composition according to claim 1, wherein the defoamer is based on polysiloxanes or alkylbenzenes. 4. A composition according to claims 1 to 3 comprising 0.005 to 0.1 wt. anticorrosive agents, for example dibenzyl sulfoxide. 5. A composition according to any one of Claims 1 to 4, wherein the composition comprises from about 2% to about 10% by weight of the composition. inorganic or organic peroxyacids such as persulphuric acid or peracetic acid.