DE2835683A1 - PROCESS FOR INCREASING THE STABILITY OF ORGANIC HALOGENIC BACTERICIDES IN HYGROSCOPIC SALT - Google Patents

Description

PATENT AGENCY OFFICE

BERLIN - MÖNCHEN

SL

PATENT LAWYERS

DIPL-ING. W. MEISSNER (BLN) DIPL-ING. P. E. MEISSNER (MCHN) DIPL-ING. H.-J. PRESTING (BLN)

HERBERTSTR. 22, 1000 BERLIN 33

Your sign Your letter from our sign Berlin, the

4-0.196 / 71 "U. AUG. 1978

Societe Anonyme dite:

Compagnie des Salins du Midi et des Salines de l'Est

51 »rue d'Anjou, Paris 8 °, France

Process for increasing the stability of organic halogen-containing bactericides in hygroscopic salts

The invention relates to a method of treatment; organic halogen-containing bactericides for the purpose of increasing the stability of the same in hygroscopic salts, in particular in sodium chloride.

The bactericidal properties of certain organic halogen-containing compositions are well known in the art; for this reason they have already been used in hygroscopic salts. In the present description and the claims, the generic term "organic halogen-containing bactericides" denotes the following compounds: chloramine-T, dichloramine-T, N-chloroformanilide, N-chloroacetanilide, the chlorinated hydantoins, the chlorinated succinamides, N-chloro-o- acetotoluid ₃ KT-ChI or- -p-acetotoluid, D ^ o-dichloroacetanilid, Ν, ρ-dichloroacetanilid, Hazolon, the N-chlorinated derivatives of sulfoamides, of heterocyclic compounds, the hydrogen in the cyclic

S09808 / 1040

BORO MONKS: TELEX: TELEGRAM: PHONE: BANK ACCOUNT: CHECK ACCOUNT: ST. ANNASTR. 11 1 - 856 44 INVENTION BERLIN BERLIN 31 W. MEISSNER, BLN-W 6000 MONKS 22 INVEN d BERLIN 030/891 60 37 BERLINER BANK AG. 122 82 -109 TEL: 029/22 35 44 030/892 23 82 3635716000

Contain core (hydantoins), of condensed amines based on cyanamide derivatives, of anilides and also the N-Bromamide and N-Bromimide and the bromine complexes with the quaternary en ammonium salts.

These bactericides all have the disadvantage, when incorporated in a hygroscopic salt, that they are themselves slowly decompose by hydrolysis under the action of moisture from ambient air and release of gaseous Chlorine or halogen. As a result, there is a loss of primary material and a reduction in the effectiveness of the bactericide and pollution of the surrounding atmosphere.

One aim of the invention is to obviate this drawback and to propose a method for the treatment of these organic halogen-containing bactericides, with which their stability is increased in hygroscopic salts.

The invention therefore has a method for improving the stability of organic halogen-containing bactericides in a hygroscopic salt to the object, which method is characterized in that prior to its incorporation in this organic halogen-containing bactericide is compacted or compressed in the form of grains and then the said salt the effect of moist air or water vapor at a temperature is exposed below 1oo 0.

The invention also has such compacted organic halogen-containing bactericides and the hygroscopic salts for Articles in which these bactericides are incorporated.

Surprisingly, it has been found that the organic halogen-containing bactericides do not contain more than 3% of their chlorine content in the course of the treatment carried out according to the invention

9 09808/1040

lose length and they remain completely stable more chlorine. lose, macM.em them hygroscopic Salaen have been incorporated.

With regard to this Yerbessemm? *: The stability of these halogenated en Bakterside can the following ErK without, however, the invention

These chloraadüae can become the following formulas, corresponding to the values of the groups R and t ¹ :

^ H- Cl

or RS = Cl _?

Contact with water hydrolyzes these tertiary indians according to the same kewielitsresJction:

HOCl

The hydrolysis constant Tfc is consequently, dmuccli. the

_{k m}

ß H ¹ -

Are defined. This constant of hydrolysis is very low and can vary depending on the product concerned from 1o ~ feis 1o ~ ° From this relationship it can be deduced that these products are completely hydrolyzed in a solution which has a very low level Has a concentration of chloramine (concentration range a few ppm). In contrast, a concentrated solution is a very low proportion of product hydrolyzes, and the concentration of free chlorine in the form of hypochlorous acid is small.

909808/1040

It has become apparent, for example, that there is a loss of 15 wt .-% Galcium hypoehlorit approximately Jo 000 ppm chlorine in contains form of hypochlorous acid; compared to this the solution that is more concentrated in chloramine-T ^ only 3,000 ppm chlorine in the form of hypochlorous acid.

In this "equilibrium" hydrolysis reaction lies in the case when the compacted or compressed ■ bactericidal grain exposed to the action of water vapor, an amine and a chloramine before which with each other to obtain an amine and / or a new chloramine with a significantly lower Hydrolysis constant react. It therefore comes on the surface of the compressed or compressed grain to form a skin or coating made of amine and / or chloramine, which because of the low hydrolysis constant (below 1o '") the compressed or isolate compressed grain from ambient moisture.

In practicing the invention, the bactericides are usually compacted in the form of granules under pressure

ken between 0.8 and 5 t / cm *.

On the basis of a non-limiting example, it was established that the treatment with humid ambient air or with water vapor of chloramine-T pastilles with a diameter of

20 mm, compressed at a pressure of 2 t / cm ", shows a loss of available chlorine of about 3 % and that sodium chloride, which contains 0.1 to 10 wt .- ^ of these pastilles, in the course of storage on the in the open air does not release any chlorine odor over a long period of time.

It has been found that the same effects can be obtained if among the. the same conditions the N-bromamides, the N-bromimides and treating the bromine complexes with the quaternary ammonium salts.

909808/1040

Claims (3)

Claims 1. A method for improving the stability of organic halogenated bactericides in a hygroscopic salt, characterized in that before incorporation in this salt, this organic halogenated bactericide is compressed or compressed in the form of grains and then the action of moist air or water vapor at a temperature below 100 ° C is exposed. 2. The method according to claim 1, characterized in that these organic halogenated bactericides are compressed under a pressure of 0.8 to 5 t / cm ". 3.Organic halogenated bactericide with improved stability, obtained by a method of claims 1 or 2. 4 ·. Hygroscopic salt, especially sodium chloride, in the mass of which a bactericide according to claim 3 is incorporated. BORO MÖNCHEN: ST. ANNASTR. 11 SOOO MONKS TEL .: 089/22 35 44 TELEX: 1 - 856 INVEN d 909808/1040 ■■ / TELEGRAM: INVENTION BERLIN TELEPHONE: BERLIN 030/891 60 030/892 23 BANK ACCOUNT: £ • BERLIN 31 BERLINER BANK AG. 3695716000 POST CHECK ACCOUNT: W. MEISSNER, BLN-W 12282-109