CZ4026U1 - Tabletted inhibitor of sediments for water systems - Google Patents

Description

Tabletizable sediment inhibitor for water systems

Technical field

The invention relates to a tabletizable inhibitor which prevents the formation of calcium carbonate-based deposits in aqueous systems. The solution can be used not only for closed, but especially for partially or fully open water systems.

BACKGROUND OF THE INVENTION

The issue of the formation of deposits on the inner walls of equipment, fittings and pipelines exposed to permanent contact with flowing or circulating water is of long-term interest of experts. Numerous inhibitory systems have been gradually developed based on this principle, mostly using the principle of chemical destruction of emerging or already formed deposits. Less widespread are still mechanical methods based on the principle of circulating bodies of suitable shape, surface type, specific gravity and mechanical properties. The reason for their lower utilization can be seen in several facts: they mostly act only as a preventive measure, their application requires a relatively demanding optimization of the aforementioned several factors for given specific conditions and especially the possibilities of use are limited only for closed systems. For these reasons, chemical inhibition systems are currently predominant, although they also have some disadvantages and drawbacks.

Known inhibitors of calcium carbonate deposits are, for example, alkali metal polyphosphates, optionally with the addition of high molecular weight organic substances. A disadvantage of these inhibitors is their tendency to hydrolyze at higher temperatures. Inhibitors of the organophosphate type are more effective, especially in combination with suitable high molecular weight substances. However, their use, especially in open water systems, is supported by more demanding production technologies and the associated higher price.

In open systems, unless the application itself precludes, inhibitors based on any of the above-mentioned types are used whose effect is sufficiently potentiated and the cost is made available by combination with more aggressive yet economically advantageous substances (e.g. divalent metal salts, etc.). However, this path is unacceptable for many other applications due to health problems and is likely to be reassessed for the current field of application under the influence of increasingly urgent environmental factors.

In view of all the above, other types of chemical inhibitors have been developed. By way of example, a highly optimized alkali metal hydrogen phosphate inhibitor supplemented with a pyrophosphate and optionally also an alkali metal hexametaphosphate can be mentioned.

However, the practical use of chemical inhibitors is not only a matter of the parameters discussed so far - intrinsic efficacy, health or environmental safety and affordability. Equally important is a form of inhibitor that allows the necessary dosage without special problems. This is not negligible even in industrial applications, much less in open water operation

-1GB 4026 For domestic systems, which are primarily mass washing machines today.

One way is the presence of inhibitors in the laundry detergent itself. Here, however, if they are not to be disproportionately increased in price, the inhibitors are present only in an amount which does not ensure their sufficient effect. It is also possible to add the inhibitor separately to the wash solution. This route is used mainly abroad. Because the available inhibitors are in powder form, their dosage is difficult. The practice is that they are added to the wash solutions at random in a higher than optimal amount to ensure washing safety and hygiene. The result is an uneconomical to health overdose in individual cases, while at other times the use of an inhibitor is often neglected due to unpleasant handling of the powder material. On the one hand, this increases the cost of standard washing without affecting the quality, on the other hand, there is no regular and sustained inhibitory effect with a possible impact on the saving of the machine (washing machine).

The essence of the technical solution

These drawbacks and drawbacks of the prior art inhibitory systems are largely overcome by the tabletable sediment inhibitor for the aqueous systems of the present invention. It is based on the fact that in addition to the inhibitory component based on a mixture of alkali metal phosphates in a total amount of 16 to 23% by weight. contains as cohesive components a cellulose-type polysaccharide in an amount of 25 to 35 wt. and a starch type polysaccharide in an amount of 30 to 35 wt. and a processing additive, preferably hydrated magnesium silicate in an amount of 5 to 12 wt. Preferably, the cellulose-type polysaccharide may be micro-cellulose, the starch-type polysaccharide is preferably corn starch, and the processing additive is primarily talc.

The composition of the tabletizable inhibitor composition according to the invention ensures, due to its cohesive components, the cohesion of the tablets, but also their rapid solubility on application. Addition of a processing additive (talc) makes it possible to achieve a smooth surface of the tablets and enable their smooth production. The tablet form greatly facilitates the dosage of the inhibitor. Moreover, in the form in which the active ingredient constitutes only about 1/5 of the total weight of the tablet, dosage accuracy can be increased accordingly. The regular application of inhibitor tablets containing an optimum amount of active ingredient then results in the expected inhibitory effect, respecting as far as possible economic and ecological factors.

Example of technical solution

A mixture of alkali metal phosphates known from the prior art was formed in a high-speed mixer. After separation of the large crystals by means of a dense sieve, a batch containing 20 wt. d. d. bucose (microcellulose) wt. d. corn starch wt. d. talc.

-2GB 4026 U

The mixture was again mixed in a high-speed mixer for 25 s. After homogenization, the mixture was poured into a container of a tabletting machine and processed into 1.1 g tablets.

Claims (2)

PROTECTION RIGHTS *, Tabletizovatelný first deposit inhibitor for aqueous systems, ye '* characterized by the fact that in addition to inhibiting components ^r based on a mixture of phosphates of alkali metals in a total amount 16 to 23 wt. contains as cohesive components a polysaccharide, a cellulose-type in an amount of 25 to 35 wt.%, a starch-type polysaccharide in an amount of 30 to 35 wt. and a processing additive, in particular hydrated magnesium silicate, in an amount of 5 to 10% 12 wt. A tabletizable sediment inhibitor for aqueous systems according to claim 1, characterized in that it contains microcellulose as cohesive components in an amount of 28 to 32% by weight. and corn starch in an amount of 32 to 34 wt. and as a processing additive talc in an amount of 7 to 10 wt.