RU2517192C1 - Detergent for treating food processing equipment - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: detergent is phosphate-free and has high detergent power and low foaming. The detergent for treating food processing equipment contains an alkali metal hydroxide, a mixture of nonionic surfactants and water. The detergent further contains a sodium salt of aldonic acid in form of sodium gluconate, low-foam nonionic surfactant in form of C8-C10 alkyl polyglycoside and triethanolamine, and the mixture of nonionic surfactants is added in form of a mixture of ethoxylated fatty alcohols with hydrocarbon radical chain length of C12-C14 with ethoxylation degree of 6 and 10, with the following ratio of components, wt %: alkali metal hydroxide 20-30, sodium gluconate 1-3, low-foam nonionic surfactant - C8-C10 alkyl polyglycoside 0.1-1, triethanolamine 0.1-1, mixture of nonionic surfactants -10, water - the balance.

EFFECT: producing phosphate-free low-foam detergent, high detergent power.

2 tbl

Description

The invention is intended for use in food industry enterprises for washing equipment by the method of circulation, recirculation, immersion, spraying, SIP-washing (automatic and semi-automatic CIP cleaning of technological pipelines in food industry enterprises). The proposed detergent can be used to remove contaminants and persistent organic deposits: fats, oils, denatured protein, burns, vegetable pigments, food colors from the inner surfaces of food processing equipment, ensuring the stable operation of food processing equipment during operation. The invention relates to synthetic phosphate-free low-foam detergents.

Currently, there are a number of known detergent compositions used for cleaning, containing an active alkaline additive, various kinds of surfactants with low foaming. For example, a tool for cleaning and degreasing a metal surface from various types of contaminants (RU 2171831, C11D 3/04, decl. 22.12.2000, publ. 10.08.2001). The detergent contains (wt.%):

Water Soluble Alkali Metal Salt 50-94 Nonionic surfactant 3-20 Polyacrylic Acid Sodium Salt 0.5-15 Dispersant 1-5 Antifoam agent 0.1-1 Water rest

The above tool has disadvantages, it is a low wettability of the surface being cleaned, and therefore, a predicted low washing ability, in addition, we can expect corrosion of the metal surface due to the high alkali metal salt content.

As a prototype, a detergent was selected (RU 2359013, С11D 1/825, decl. 06/27/2007, publ. 10.01.2009), including the following components, g / l:

Alkali metal hydroxide (sodium, potassium) 1.16-6.3 8 Sodium silicate 0.01-0.70 Sodium Tripolyphosphate 0.016-0.09 Complexon 0.0095-0.05 A mixture of non-inorganic surfactants Berol DGR81 0.078-0.428 Water rest

The disadvantage of the above composition is the relatively low content of surfactants, which adversely affects the quality of cleaning from contamination or affect the consumption of funds. In addition, the surfactant mixture Berol DGR81 has an average foaming and makes it impossible to use this composition in a closed washing cycle, since a significant and stable foam is formed, a significant amount of clean water is consumed to remove the remaining foam. Also, the product contains salts of phosphoric acid, which, falling into water bodies, reduce the oxygen content in water, cause disease and death of flora and fauna in them, create difficulties in supplying drinking water.

The technical task of the claimed invention is the creation of phosphate-free low-foam detergent, as well as increasing its washing ability.

This problem is solved in that the detergent for processing food processing equipment containing alkali metal hydroxide, a mixture of nonionic surfactants and water, according to the invention additionally contains sodium salt of aldonic acid in the form of sodium gluconate, low-foam nonionic surfactant in the form of alkyl polyglycoside C8-C10 and triethanolamine, and a mixture of nonionic surfactants introduced in the form of a mixture of ethoxylated fatty alcohols with a length of hydrocarbon radical C12-C14 with the degree Iew ethoxylation of 6 and 10 in the following ratio of components, wt.%:

Alkali metal hydroxide 20-30 Sodium Gluconate 1-3 Low-foam nonionic surfactant - alkylpolyglycoside C8-C10 0.1-1 Triethanolamine 0.1-1 A mixture of nonionic surfactants 1-10 Water rest

Sodium or potassium hydroxide is used as the alkali metal hydroxide in the detergent composition. The sodium salt of aldonic acid in the form of sodium gluconate is introduced as a complexing agent, the low-foam nonionic surfactant in the form of C8-C10 alkyl polyglycoside is introduced as a wetting agent, and triethanolamine as a hydrotropic agent. The elimination of phosphates ensures environmental safety.

To achieve optimal results when cleaning from contaminants, it is recommended to use water with a temperature of 20-60 ° C and a detergent concentration of 0.5-1.5%. The washing ability is determined by a known method by the gravimetric method, which is based on determining the percentage of washability of contaminants from the surface of the part.

Table 1 shows the compositions of detergents with different content of components, wt.%.

Tests of detergents are as follows. Parts with a surface roughness of 0.32-0.61 with a size of 100 × 50 × 1.5 mm are degreased with ether and incubated for 5-10 minutes until the ether is completely evaporated and they take a constant temperature. The parts are weighed on an analytical balance to the nearest 0.0001 g. Then, with a glass rod, apply a uniform layer of model pollution containing soot of organic origin, a mixture of vegetable fats, animal fat, milk fat. The amount of contamination applied should be approximately the same on all parts and be 0.01-0.015 g. Then, the contaminated parts are placed in a laboratory washer and washed for 2 minutes. After washing, the parts are washed with distilled water and dried by blowing air from a fan at room temperature. After drying, they are weighed. The washing ability of the test detergent composition in% is calculated by the formula:

$$\frac{R\mathrm{one}-R2}{R\mathrm{one}-R0}\times \mathrm{one\; hundred}=M\mathrm{about}\mathrm{Yu}u\mathrm{but}\mathrm{I\; am}\mathrm{from}P\mathrm{about}\mathrm{from}\mathrm{about}bn\mathrm{about}\mathrm{from}tb,\%$$

where P ₀ is the initial weight of the sample (pure), g;

P ₁ is the weight of the contaminated sample, g;

P ₂ - the weight of the sample after washing, g

The foaming of the compared compositions is determined by the standard Ross-Miles method, which consists in assessing the height of the foam by shaking a graduated cylinder with a 1% solution of detergent.

When determining the wetting ability, samples (metal plates with a size of 150-70 mm) are first immersed in the prepared detergent solution, and then in demineralized water for 10 seconds. Next, the samples are removed from the water and fix the violation of the continuity of the water film visually. In this case, the surface removed from the edges and sharp edges by less than 10 mm is not taken into account. Wetting ability is characterized by the time in seconds from the start of the test to rupture of the water film.

All test results are shown in table 2.

As can be seen from table 2, with an average ratio of components, the detergent has a high washing ability and low foaming. When the alkali metal hydroxide content is less than 20%, the suspending and washing ability of the washing solution is reduced, equipment wear due to corrosion is significantly increased by more than 30%; when the content of sodium gluconate is less than 2.5%, hardness salts do not bind, with an increase in its amount more than 10%, a white precipitate forms; when the content of alkyl glycoside is less than 1%, the detergency of the solution deteriorates, more than 2% increases foaming, the solution is stratified into two fractions, when the content of triethanolamine is less than 0.1%, the alkyl polyglycosides and ethoxylates of fatty alcohols do not dissolve, the removal of fatty impurities worsens, stratification occurs solution.

When using a detergent composition containing the claimed components in a larger ratio than stated, an increase in the effect was not found and therefore a quantitative increase in the components is impractical, in a lower ratio the claimed technical result is not achieved.

EFFECT: obtaining a phosphate-free low-foamy detergent for cleaning various types of alkali-resistant surfaces from persistent organic deposits: fats, oils, denatured protein, burns, vegetable pigments, food colors by circulation, recirculation, immersion, SIP-washing. The tool provides high washing and cleaning properties and stable operation of food processing equipment during operation.

Detergent is made as follows. Pour water into a container equipped with a water jacket and a stirrer, with the stirrer switched on, add the sodium salt of aldonic acid (gluconate) and mix for 1-2 minutes, then a 46% alkali metal hydroxide solution is introduced, and cold water is supplied to the jacket for cooling mixtures up to 55-65 ° C, then a mixture of nonionic surfactants and a wetting agent are introduced in the ratios indicated above. The solution is thoroughly mixed for 3-5 minutes, after which samples are taken. The mixer should ensure uniform mixing in all layers of the mixer without stagnant zones, since it is unacceptable to find undissolved components in the solution after mixing. The sample taken should be homogeneous, without delamination and sediment (visually assessed), and also have a certain density (assessed using a hydrometer). After which the composition is cooled to room temperature and filtered. The detergent is a transparent solution with a light yellow tint with a density of 1280 kg / m ³ , an indicator of hydrogen ions of 12.4-13.5 units, which ensures the required quality of surface cleaning and corrosion resistance of the equipment. The transparency, delamination, clouding, smell and alkalinity of these formulations remain constant for 12 months. Finished detergents must be stored until dispatch to the consumer in a warehouse at a temperature of -5 to 20 ° C.

Table 1 Detergent composition Detergent compositions,% one 2 3 four 5 6 Alkali metal hydroxide fifteen twenty 23 28 thirty 34 Sodium Gluconate one 2,5 four 6 8 12 Triethanolamine 0.05 0.1 0.5 one 3 3,5 Nonionic surfactant (alkylpolyglycoside C8-C10) 0.05 0.1 0.5 one 2 2,5 A mixture of nonionic surfactants (a mixture of ethoxylated fatty alcohols with a hydrocarbon radical length of C12-C14 with a degree of ethoxylation of 6 and 10) 0.5 one four 8 10 fifteen Water rest

table 2 Indicators one 2 3 four 5 6 Washing ability,% 95.8 97.8 98.7 99.1 99.5 99,4 The height of the column of foam, cm 0,5 / 0 0.3 / 0 0.3 / 0 0.7 / 0.2 0.5 / 0.1 1.4 / 0.4 Wettability, sec 29th thirty 35 33 33 32

Claims (1)

Detergent for processing food processing equipment containing alkali metal hydroxide, a mixture of nonionic surfactants and water, characterized in that it additionally contains sodium salt of aldonic acid in the form of sodium gluconate, low-foam nonionic surfactant in the form of C8-C10 alkyl polyglycoside and triethanolamine, and a mixture of nonionic surfactants introduced in the form of a mixture of ethoxylated fatty alcohols with the length of the hydrocarbon radical C12-C14 with a degree of ethoxylation of 6 and 10 pr and the following ratio of components, wt.%:
Alkali metal hydroxide 20-30 Sodium Gluconate 1-3 Low-foam nonionic surfactant - C8-C10 alkylpolyglycoside 0.1-1 Triethanolamine 0.1-1 A mixture of nonionic surfactants 1-10 Water rest.