DK160103B - CLEANER BASED ON ACTIVE CHLOR AND ALKALI - Google Patents

Description

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DK 160103 B

The invention relates to a cleaning agent based on active chlorine and alkali. Such cleaners are used in practices for cleaning pipes and ducts and the like, e.g. 1 milk processing apparatus. Usually the purification takes place at 40 ° C - 45 ° C and therefore the mixture must be preheated to a suitable temperature. Normally, surfactants other than wetting agents in such mixtures are not used because otherwise there would be too much foaming, especially at elevated temperatures and intense mechanical treatment, which would consequently affect the cleaning rather in an unfortunate direction than in an advantageous way.

Such cleansers are very different from the so-called thickened bleaching agents, such as e.g. mentioned in GB Publication No. 207610 and EP Publication No. 0.072,600, which contains much more hypochlorite solution than alkali (see page 2, line 25 1 EP Publication No. 0.072,600), wherein the added surfactant serves 15 to thickening of the compound. The present compounds are to be used industrially and contain all potassium hydroxides in an amount of at least 50% of the bleaching agent.

Surprisingly, it has been found that, when added to these agents, a very limited group of ether carboxylic acid preparations have a combination of a very effective surfactant and a low foaming, which allows these compounds to be used in the present cleaning agents. , and then using these cleaners at room temperature. Therefore, an important energy saving is achieved in this way, which is not at the expense of the cleaning effect.

The present invention therefore relates to active chlorine and alkali cleaners characterized in that they also contain a minor amount of a compound of the formula: c "Hi70" (C2H + °) nCH2C00M, where M is sodium or potassium and n is a number having an average value between 1 and 10.

The present surfactants are known in themselves and belong to a group of compounds which have been known for a long time for its usefulness. Within this group of connections - 2 - ΓΛ \ / Λ / r \ -1 Γ · 7 D '

Ur \; :,; 1.1; D

however, the C H compounds have always been considered a kind of boundary case, and compounds developed from more long chain hydrophobic groups were always preferred. This is not only apparent from the aforementioned GB Publication No. 2,076,010, which, although it mentions that the hydrophobic group may be e.g. a Cg-20 alkyl group, prefers C - C, and from EP Publication specification 0.072,600 which, as a hydrophobic group, i. mentions an alkyl group of 8 to 18 carbon atoms and prefers Cl 2 -Cig, but also from NL Publication No. 7405231, wherein the hydrophobic group may again be a C 8 -C 20 alkyl group -10 but again C 12 -Cift alkyl is preferred and FR Publication 1,099,847, which, although mentioning a CH₂ compound as an example of a possible compound, also clearly prefers larger alkyl compounds. It should be noted that the Cg compound is not used in some of the examples in the aforementioned writings.

In the compounds used in the present invention, the alkyl group C H 2 may be a straight chain or a branched group, e.g. n-octyl or 2-ethyl hexyl. In principle, of course, the free acid can also be mixed in the compound containing the active chlorine and alkali, so that the desired salt is formed in situ. Theoretically, it is of course also possible to use other salts, such as e.g. ammonium salts or organic ammonium and amine salts, but in practice a salt of ether carboxylic acid with the same anion is used, preferably with the same anion as in all the potassium hydroxide compound in the base mixture.

The other components of the system are the usual ones for this kind of connection. The alkali is Κ0Η or NaOH and the concentration of it can be varied within relatively large limits, generally between 20-250 grams / l. A suitable concentration is in the order of 80-120 g / l. The active chlorine in the system can be derived from various known compounds. Chlorine bleaching liquor is a cheap product and is therefore generally used. However, a compound such as trichlorocyanuric acid or chloramine T can also be used as a chlorine-producing agent. Usually, the system contains about 3% - 6% of active chlorine, preferably about 4.5%. As already mentioned, the amount of alkali in such a system is at least 50% of the amount of bleach.

The amount of surfactant to be used in accordance with the present invention can best be expressed in the weight ratio of surfactant to active chlorine. This weight ratio can generally range from 1:10 to 1: 3. Thus, it is convenient to use 0.65% of the present surfactant at the above preferred amount of 4.5% of active chlorine.

EXAMPLES

A number of mixtures were prepared each containing 30% hypo-10 chlorite bleach (150 g chlorine / l), 20% of a 50% aqueous potassium hydroxide, the percentages of ether carboxyl potassium salt listed in the following, and the remainder water. The ether carboxyl salts used had the formula octyl-O- (C 2 H 40) nCH 2 CO.

Example I II III IV V VI VII VIII IX X XI

% n «3 0.5 1 0.75 0.5 0.5 0.25 0.4 - 0.25 -% n * 5 - 0.75 0.5 - 0.5 0.4 - - 0.25 0.65% n * 8 1 0.5 - - 0.25 - - 0.60 0.65 0.25 -

A foaming study was performed by dissolving 10 g of 15 each product in 1 liter of tap water (German hardness about 20 °), vigorously shaking 50 ml of this solution in a 100 ml shaking cylinder and reading the foam volume after 1 minute. In this experiment, a foam volume of 15 ml or less is considered satisfactory. The results of these experiments are given in the following table.

Γ ', Ι / * ί, - Γ5 / -I ν Ο UΓ \. <1 ./; > 1 Ο Ο - 4 - EXAMPLE TEMPERATURE, ° C ml foam I 20 10 II 20 12 _III_20_13_ IV 20 12 V 15 8 _VI_15_9_ VII 13 6 VIII 13 7 _IX_12_9_ 13 7 14 9 _19 _5_ 20 6 X 13 13 _XI_12_9_ 20 7

For some purposes, KOH is preferred in these kinds of compounds and for other purposes NaOH is preferred. This makes no difference to the effect of the present invention, as will be apparent from the following two examples.

The mixtures of Examples IX and XI were again prepared, but this time with sodium hydroxide. These mixtures are denoted by Examples IXa and Xla. They were also subjected to the above foam formation study, at 12 ° C and 20 ° C. The results are set out below and for reasons of clarity, the corresponding results with 10 potassium hydroxide from the above table are listed again.

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EXAMPLE ml foam at 12 ° C ml foam at 20 ° C

IX 9 6 IXa 10 7 XI 10 7 XIa 11 6

Claims (3)

1 Active chlorine based detergent such as bleaching agent and alkali metal hydroxides in an amount of at least 50¾ of the bleaching agent, characterized in that it contains a minor amount of a low-foaming compound of the formula: 5 c.Hi, ° - (cA °) nCH2C00M 'where M is sodium or potassium and n is a number having an average value between 1 and 10. Purifier according to claim 1, characterized in that the weight ratio of the low foaming compound to the active chlorine is 1:10 to 1: 3. A cleaning agent according to claim 1 or 2, characterized in that it contains 3% - 6% of active chlorine in the form of a bleaching liquor. 15