Drug – bio-affecting and body treating compositions – Fermentate of unknown chemical structure – Having a known elemental analysis
Patent
1984-10-24
1986-03-04
Schenkman, Leonard
Drug, bio-affecting and body treating compositions
Fermentate of unknown chemical structure
Having a known elemental analysis
424130, 424149, 424164, A61K 3320, A61K 3340, A61K 3342
Patent
active
045740844
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a process for the preparation of a stabilized, modified, aqueous chlorite solution with a content of a peroxy compound, the chlorite solution obtained by this process and the multiple possible uses thereof as a biocide.
BASIC PRIOR ART
Modified, aqueous, chlorite solutions, particularly aqueous sodium chlorite solutions stabilized by means of peroxy compounds have a large number of different uses in technology and in other fields, such as e.g. for oxidative purposes. Such solutions are inter alia used for the treatment of water to be used as drinking water, as well as swimming pool water and water for industrial use for disinfection purposes.
The stability thereof is not adequate. Therefore, numerous attempts have been made to obviate this shortcoming. It is generally known to use alkaline stabilizing agents, such as e.g. sodium carbonate, as well as hydrogen peroxide and inorganic compounds derived therefrom, such as e.g. perborates.
It is also known that aqueous chlorite solutions, in which chlorine dioxide is in equilibrium with chloric acid in the acid range, can be stabilized by means of pyridine (cf Holleman/Wiberg "Lehrbuch der anorganischen Chemie", 47-56 edition, 1960, p. 127). The stabilized chlorite solution prepared in this way is also not sufficiently stable. Moreover, pyridine-stabilized chlorite solutions cannot be used in systems, where an additional loading with an organic substance is to be avoided, such as e.g. in drinking water and swimming pool water treatment. In addition, pyridine is a carcinogenic substance.
Stabilized and even unstabilized chlorite solutions play a particular part in the treatment of swimming pool water. Conventional, also stabilized chlorite solutions, must undergo an acid reaction course at a pH-value .ltoreq.3 in such a "chlorine/chlorine dioxide process". For this purpose, it is necessary to use special equipment, which is not directly integrated into the water cycle. This applies both to the acid process and to the hypochlorous acid process, which are subordinate to the aforementioned chlorine/chlorine dioxide process. If sodium chlorite and hydrochloric acid are used, then sodium chloride and chlorine dioxide are formed therefrom according to this so-called hydrochloric acid process at the aforementioned pH-value. For the purposes of this reaction, reaction towers with Raschig rings are recommended in a size guaranteeing a corresponding reaction time, in order to obtain a very high conversion rate. This is also intended to ensure that on introducing the reaction product, the residual chlorite content in the swimming pool water is as low as possible, particularly max. 0.1 mg/1. To prevent a redisproportioning to chlorite-chlorate, the chlorine to chlorine dioxide ratio in the swimming pool water is fixed at 10:1. In the aforementioned hypochlorous acid process, the reactions take place in the following way. For example, a sodium chlorite solution and chlorine are metered into a water tank upstream of the water disinfection process. A reaction then takes place at a pH-value of .ltoreq.3, in which hypochlorous acid is formed as an intermediate stage and finally chlorine dioxide. The thus prepared solution is then metered into the pool water as required.
In both the aforementioned processes (acid process and hypochlorous acid process), high expenditure on equipment is necessary and it must also be constantly ensured that in the acid process the hydrochloric acid supply is absolutely ensured and in the hypochlorous acid process that the chlorine supply is absolutely ensured, in order to avoid a disadvantageous metering of unreacted chlorite into the pool water. However, as occasionally deficiencies cannot be reliably prevented, this always constitutes a risk for the bather. In addition, the accidental mixing of commercial chlorite solutions with acids leads to explosive phenomena.
DISCLOSURE OF THE INVENTION
The problem of the invention is therefore to so improve the aforementioned processes, that a more stable proce
REFERENCES:
patent: 2358866 (1944-09-01), MacMahan
patent: 3271242 (1966-09-01), McNicholas et al.
patent: 4296103 (1981-10-01), Laso
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