NL8301168A - CLEANER BASED ON ACTIVE CHLORINE AND ALKALI. - Google Patents

Description

S 2158-32 '»♦ P & c m: -...........

Short designation: Cleaning agent based on active chlorine and alkali.

The invention relates to a cleaning agent based on active chlorine and alkali. Such cleaning agents are used in practice for cleaning pipes, for example in milk extraction equipment. This cleaning usually takes place at 40-45 ° C and therefore the mixture must be preheated to a suitable temperature.

Normally no surfactants other than wetting agents are included in these mixtures, because otherwise too much foaming would occur, especially at the elevated temperatures and the intensive mechanical action, and thus the cleaning action would be adversely affected than advantageously.

Surprisingly, it has now been found that a small group of ether-carboxylic acid derivatives in this type of mixture combines a very good surfactant effect with low foaming, which makes it possible to incorporate these compounds in the cleaning agents and then to use these cleaning agents at room temperature. . In this way an important energy saving is thus obtained without this being at the expense of the cleaning effect.

The invention therefore relates to active chlorine and alkali-based cleaning agents which are also characterized in that they also contain a minor amount of a compound of the formula C8H17 ° - (C2H401n0H2C00K '' in which M represents sodium or potassium and n is a number with an average value of 1-10.

The alkyl group C 8 H 4 can be straight or branched, for example n-octyl or 2-ethylhexyl. In principle, of course, the free acid can also be included in the active chlorine and alkali-containing mixture, so that the desired salt is formed in situ. Theoretically, it is of course also possible to use other salts, such as the ammonium salt or organic ammonium and amine salts, but of course, in practice, a salt of the ether carboxylic acid with the same hydroxide as the alkaline component in the base mixture is preferably used.

The other components in the system are the usual ones. The alkali is KOH or NaOH and the concentration thereof can vary within wide limits, generally from 20 to 250 g per liter. A suitable concentration is on the order of 80-120 g. The active chlorine in the system can come from various conventional compounds. Chlorine bleach lye is a cheap product and is therefore generally used. However, a compound such as trichloro cyanuric acid or chloramine T can also be used as an 8 3 0 1 1 6 8 - 2 - chlorine releasing agent. Usually the system contains about 3-6% active chlorine, preferably about 4.5%.

The weight ratio between the surfactant and the active chlorine can generally range from 1:10 to 1: 3. For example, at the aforementioned amount of 4.5% active chlorine, suitable 0.65% of the surfactant can be used.

EXAMPLES

A number of mixtures were prepared containing 30.0% chlorine bleach (150 g chlorine / liter), 20.0% 50% caustic potash, the 10 percent ether carbonic acid potassium salts specified below, and the balance water. The ether carboxylic acid salts used had the formula octyl-O- (C 1 H) -CELCOOK.

α · 4 Π jL

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

% η = 3 0.5 1 0.75 0.5 0.5 0.25 0.4 - - 0.25% η = 5 - - 0.75 0.5 - 0.5 0.4 - - 0 .25 0.65 15% η = 8 1 0.5 - 0.25 - - 0.60 0.65 0.25

A foam test was performed by dissolving 10 g of each product in 1 liter of tap water (hardness approx. 20 ° German), shaking 50 ml of this solution by hand in a 100 ml shaking cylinder and shaking off the foam volume after 1 minute to read. A foam volume of 15 ml or less is considered satisfactory in this test. The results of these tests are shown in the table below.

Example Temperature, ° C ml Foam I 20 10 II 20 12 25 µl 20 13 IV 20 12 V 15 8 VI 15 9 VII 13 6 30 VIII 13 7 IX 12 9 13 7 14 9 19 '5 35 20 6 X 13 13 XI . _ 12 9 8301168 2o 7 * - 3 -% ~ *? E - =

For some purposes, KOH is preferred in these types of preparations, and again NaOH for other purposes. This makes no difference to the effect of the invention, as can be seen from the two examples below.

The mixtures of Example IX and XI were prepared again, but this time with NaOH. These mixtures are named Example IXa and Xla, they were also subjected to the above foam test at 12 ° C and 20 ° C. The results are shown below, with the corresponding results repeated with KOH from the table above for the sake of clarity.

Example ml Foam at 12 ° C ml Foam at 20 ° C

IX 9 6 IXa 10 7 XI 10 7 15 Xla 11 6 8301168

Claims (3)

Cleaning agent based on active chlorine and alkali, characterized in that it also contains a small amount of a compound of the formula C „H,„ O- (C_H.0) CH.COOM, in which M represents sodium or potassium and 8 17 2 4 n 2 5. is a number with an average value of 1-10. Cleaning agent according to claim 1, characterized in that the weight ratio between surfactant and active chlorine is 1:10 to 1: 3. Cleaning agent according to claim 1 or 2, characterized in that it contains 3 - 6% active chlorine in the form of chlorine bleach. 8301168