JPH08132093A - Detergent composition - Google Patents

Abstract

PURPOSE: To obtain a detergent composition capable of efficiently removing a slime consisting of the algae and bacteria generated in various service water lines, a scale consisting of metal oxide and rust by using hydrogen peroxide, condensed ammonium phosphate and urea compd. respectively as the effective components. CONSTITUTION: The slime consisting of algae and bacteria, scale consisting of the oxide of metal such as Ca and Fe and rust generated in a pipeline in the various service water lines such a heat exchanger are efficiently removed by this detergent composition. Namely, hydrogen peroxide, condensed ammonium phosphate and urea compd. are respectively used as the effective component of the composition. The content of hydrogen peroxide is controlled to 1-35wt.%, that of condensed ammonium phosphate to 30-60wt.% and that of urea compd. to 1-20wt.%. The urea compd. is at least one kind selected from urea, biuret and triuret, and further a hydrogen peroxide decomposing enzyme and/or a rustinhibiting agent can be incorporated into the composition.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a detergent composition. More specifically, the present invention has an excellent effect in removing both slime and scale (particularly, a scale containing silica as a main component) in various water systems, and further has a cleaning composition excellent in rust removing ability. Regarding things.

[0002]

2. Description of the Related Art In various water systems such as heat exchangers, coolers, and condensers, slime containing algae, bacteria, etc. as main components is generated in the pipes to block or cool the pipes. There is a problem of reduced ability. Further, there is also a problem that scales mainly composed of oxides of metals such as Ca, Mg and Si and rusts composed of oxides of metals such as Fe, Cu and Zn are generated on the inner wall surface of the pipes to corrode the pipes. . In particular, the removal of the scale containing silica (SiO ₂ ) as a main component is a big problem under the present circumstances.

Conventionally, hydrazine has been mainly known as a slime removing agent. Hydrazine has an excellent slime-removing effect and is still widely used, but its effect on the removal of scale is poor.

According to Japanese Examined Patent Publication No. 42-16521,
To remove both slime and scale, it has been proposed to add hydrogen peroxide or a composition comprising it and ammonia or ammonium chloride to the cooling water system. As is well known, when hydrogen peroxide reacts in water, it decomposes into water and oxygen to generate oxygen bubbles (foaming). That is, oxygen generated by decomposition of hydrogen peroxide oxidizes slime,
Oxidized slime is removed by foaming, so hydrogen peroxide is effective in removing slime to some extent, but it does not have the ability to remove scale and rust. In addition, COD (chemical oxygen demand) of the water system It has an unfavorable characteristic of significantly increasing. In addition, addition of ammonium or ammonium chloride does not substantially improve the effect of removing scale and rust.

In Japanese Patent Laid-Open No. 63-97288, hydrogen peroxide or an inorganic hydrogen peroxide adduct capable of liberating hydrogen peroxide (for example, sodium tripolyphosphate perhydrogen adduct etc.) and formic acid is disclosed in a water system. , A method of adding a percarboxylic acid such as peracetic acid or perpropionic acid has been described, but only slime is removed by this method and it is not effective for scale removal.

Further, Japanese Patent Application Laid-Open No. 3-288585 discloses an aqueous solution containing an alkali agent such as sodium hydroxide and sodium phosphate, a phosphate ion generator such as sodium hexametaphosphate, sodium trimetaphosphate and sodium tripolyphosphate, zinc chloride, Disclosed is a method for removing slime and scale by sequentially adding a zinc ion generating agent such as zinc sulfate and hydrogen peroxide. However, it cannot be said that this method also has a sufficient effect, and in particular, it is not so effective in removing the scale containing silica as a main component.

On the other hand, a detergent composition containing a condensed ammonium phosphate and a urea compound as active ingredients is known (Japanese Patent Publication No. 59-5670). Although this composition has the ability to remove common scale, it is also less effective against silica scale and has little ability to remove slime.

[0008]

As a result of intensive studies to solve the above-mentioned problems of the prior art, the present inventor has found that hydrogen peroxide, which is known as a slime removing agent, and condensed ammonium phosphate, which is known as a scale removing agent. When mixed with a composition containing a urea compound and a urea compound, a synergistic effect is obtained, specifically, the removal effect on both slime and scale is increased, and particularly the removal of scale containing silica as a main component is removed. It has an excellent ability to remove rust, is effective in removing rust, and even though it contains hydrogen peroxide, CO is temporarily added during addition.
It has been found that a cleaning composition can be obtained in which the D value is increased, but is rapidly decreased to a range without causing any actual damage. The present invention has been completed based on such knowledge.

That is, the present invention relates to a detergent composition containing hydrogen peroxide, condensed ammonium phosphate and a urea compound as active ingredients.

As the hydrogen peroxide which is the first component of the composition of the present invention, hydrogen peroxide itself, a known compound capable of releasing hydrogen peroxide in water, a mixture of two or more thereof, and the like can be used.

The blending amount of hydrogen peroxide is not particularly limited, and the type and degree of generation of slime and scale, the amount of the cleaning composition of the present invention used, the amount of water used, the type of water system, the scale of water system. It can be appropriately selected from a wide range according to various factors such as, but is usually 1% of the total amount of the cleaning composition of the present invention.
It may be about 35% by weight, preferably about 5-10% by weight.

The condensed ammonium phosphate which is the second component of the composition of the present invention is a known one in which phosphoric acid or its ammonium salt is condensed with urea, ammonia and the like. Specific examples of the phosphoric acid and its ammonium salt include, for example,
Orthophosphoric acid, phosphoric anhydride, ammonium monophosphate and the like can be mentioned. The degree of condensation of condensed ammonium phosphate is not particularly limited, but is usually about 3 to 150, preferably 8
About 110 is preferable. If the degree of condensation is much higher than 150, it may become a slurry without being dissolved even at a liquid temperature of 90 ° C. or higher, so that the etching effect may not be easily exhibited. On the other hand, when the condensation degree is less than 3, the scale removing effect may be insufficient. The condensed ammonium phosphate may be used alone or in combination of two or more.

The amount of the condensed ammonium phosphate compounded is not particularly limited, and the types and extents of slime and scale, the amount of the detergent composition of the present invention itself, the amount of water used, the type of water system, the scale of water system, etc. Can be appropriately selected from a wide range according to various factors of the above, but is usually about 30 to 60% by weight, preferably 30 to 40% by weight of the total amount of the cleaning composition of the present invention.
It should be about.

As the urea compound which is the third component of the composition of the present invention, known urea derivatives can be used.
Examples include biuret and trilet. The urea compounds may be used alone or in combination of two or more.

The blending amount of the urea compound is not particularly limited, and various types such as slime and scale types and degree of generation, usage amount of the detergent composition of the present invention itself, amount of water used, type of water system, scale of water system, etc. Although it can be appropriately selected from a wide range depending on the above factor, it is usually about 1 to 20% by weight, preferably about 5 to 10% by weight of the total amount of the cleaning composition of the present invention.

The composition of the present invention includes slime, scale,
At least one kind of hydrogen peroxide decomposing enzyme, various rust preventives and the like can be added for the purpose of further enhancing the effect of removing rust and the like or for the purpose of preventing rust generation after rust removal.

Further, in the composition of the present invention, in addition to the above components,
A known auxiliary agent added to a detergent or the like may be contained as long as the preferable effects of the composition of the present invention are not impaired. Specific examples of the auxiliary agent include various surfactants such as anionic, cationic, nonionic and amphoteric surfactants, and compounds such as builder agents that can further improve the detergency.

The composition of the present invention is dissolved by mixing hydrogen peroxide, condensed ammonium phosphate and urea compounds, and, if necessary, hydrogen peroxide decomposing enzyme, rust preventive agent and other auxiliary agents with a suitable solvent. Alternatively, it can be produced by dispersing. As the solvent used here, water is preferable, considering that it is used in various water systems. The water is not particularly limited and, for example, tap water, ground water, deionized water, pure water or the like can be used, and among them, deionized water, pure water and the like are preferable.

When the composition of the present invention is added to a water system, its concentration is not particularly limited and can be appropriately selected from a wide range according to various factors as described above, but is usually 1 to 100.
It may be about 10% by weight, preferably about 10 to 30% by weight.

[0020]

According to the present invention, by mixing hydrogen peroxide, which is known as a slime removing agent, and a composition containing condensed ammonium phosphate and a urea compound, which is known as a scale removing agent, the slime and scale of It has excellent removal ability for both, especially it shows excellent ability to remove scale mainly composed of silica, it is also effective in removing rust, and it is added even though it contains hydrogen peroxide. Provided is a detergent composition which sometimes has a temporary increase in COD value but promptly decreases to a range without causing any actual damage.

The reason why the composition of the present invention exhibits the above-mentioned excellent effects is not clear yet, but it is presumed to be as follows. That is, first, condensed ammonium phosphate and urea decompose scale and rust to some extent, metal ions such as Ca ²⁺ and Mg ²⁺ are generated from the scale, and Fe ²⁺ , Cu ²⁺ , Zn ²⁺ are generated from rust. Etc. metal ions are generated. These metal ions function as a catalyst that reduces hydrogen peroxide and decomposes it into water and oxygen. Therefore, the generation of these metal ions accelerates the decomposition of hydrogen peroxide, resulting in a significantly larger amount of foaming (generation of oxygen bubbles) than in the case of hydrogen peroxide alone. This large amount of foam serves to almost completely remove the scale and rust that have been decomposed to some extent by the condensed ammonium phosphate and urea. On the other hand, slime
Since it is removed by being oxidized by oxygen generated by the decomposition of hydrogen peroxide, if the decomposition of hydrogen peroxide is promoted as described above, the slime removal rate is further improved.

[0022]

EXAMPLES The present invention will be further clarified by the following examples, comparative examples and test examples.

Examples 1 and 2 Each component was blended in the blending ratio (parts by weight) shown in Table 1 below,
The cleaning composition of the present invention was obtained.

[0024]

[Table 1]

Test Example 1 Using the composition of the present invention of Example 1, the cooling tower was washed. The amount of the composition of the present invention used was 30% by weight based on the total amount of industrial water circulating in the cooling tower. The composition of the present invention circulated in the entire circuit of the cooling tower at room temperature (20 ° C.) for 2 hours. Start cleaning when it circulates,
It was circulated for another 2 hours to complete the washing.

The cooling tower has a capacity of 125 refrigeration tons, a cooling water capacity of 1500 liters, an inlet temperature of 37 ° C. and an outlet temperature of 32 ° C., and has been operated for 6 months with Yoshinogawa industrial water in Tokushima City. The water quality of the industrial water has a chlorine ion of 9.2 ppm, a sulfate ion of 15 ppm, and a total hardness of 46 p.
pm.

At the start and end of cleaning, circulating industrial water was sampled from the cooling tower circuit, and the COD (chemical oxygen demand) value of the water was examined. Further, the amount of hydrogen peroxide and the amount of slime were investigated, and the decomposition rate of hydrogen peroxide and the residual state of slime were examined. The washing results are shown in Table 2.

For comparison, a composition prepared by mixing hydrogen peroxide alone (Comparative Example 1), condensed ammonium phosphate 30 parts by weight and urea 5 parts by weight with water 65 parts by weight (Comparative Example 2).
Was added to 30% by weight of the industrial water amount, and a cleaning test was performed. The results are also shown in Table 2.

[0029]

[Table 2]

From Table 2, it can be seen that the composition of the present invention has an excellent slime removing effect. Further, since the composition of the present invention contains hydrogen peroxide, although the COD value temporarily increases when added, the hydrogen peroxide reacts in a short time and is consumed very efficiently, so that the slime removing effect is exhibited. Along with
It can be seen that the COD value falls to an appropriate range at the end of cleaning.

Test Example 2 The composition of the present invention of Example 2 was added to a cooling water circuit of a screw compressor (manufactured by Kobe Steel, Ltd.) so as to have a concentration of 10% by weight, circulated, and washed (scale and scale). Removal of rust) was performed. The composition of the present invention is at room temperature (2
The cooling water circuit was circulated at 0 ° C. for 2 hours. The metal concentration in the composition of the present invention after washing was measured and its effect was investigated. The results are shown in Table 3.

For comparison, hydrogen peroxide alone (Comparative Example 3), condensed ammonium phosphate 40 parts by weight and urea 10
A composition prepared by mixing 50 parts by weight of water with 50 parts by weight (Comparative Example 4) was circulated in the cooling water circuit of the same screw compressor as described above so as to have a concentration of 10% by weight, and washed. The results are also shown in Table 3.

[0033]

[Table 3]

It can be seen from Table 3 that the composition of the present invention has remarkably excellent scale and rust removal effect as compared with a composition comprising hydrogen peroxide alone or condensed ammonium phosphate and urea.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C02F 1/50 532 D 5/10 610 Z 9345-4D C11D 7/16 7/18 7/32 ( 72) Inventor Masahiro Kobayashi 463 Kagasuno, Kawauchi Town, Tokushima City, Tokushima Prefecture Otsuka Chemical Co., Ltd., Tokushima Plant

Claims (5)

[Claims] 1. A detergent composition comprising hydrogen peroxide, condensed ammonium phosphate and a urea compound as active ingredients. 2. The condensation degree of condensed ammonium phosphate is 3 to.
The cleaning composition according to claim 1, which is 150. 3. The cleaning composition according to claim 1, wherein the urea compound is at least one selected from urea, biuret and triuret. 4. 1-35% by weight of hydrogen peroxide, 30-60% by weight of condensed ammonium phosphate and 1-20 urea compounds.
The cleaning composition according to claim 1, wherein the cleaning composition contains wt%. 5. The cleaning composition according to claim 1, which further contains a hydrogen peroxide-decomposing enzyme and / or a rust preventive agent.