Drug – bio-affecting and body treating compositions – Inorganic active ingredient containing – Peroxide or compositions of or releasing gaseous oxygen or...
Patent
1992-09-22
1994-11-29
Raymond, Richard L.
Drug, bio-affecting and body treating compositions
Inorganic active ingredient containing
Peroxide or compositions of or releasing gaseous oxygen or...
25218623, 514557, 514607, 562 2, 562 3, A01N 3102
Patent
active
053688678
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the technical field of solutions containing peroxidised products intended for oxidative treatment. More precisely, the invention relates to a process for the production within a short period of time of stable solutions, in equilibrium, based on an organic peroxy acid in low concentrations.
The use of solutions containing peroxidised products as oxidising agents, bleaching agents or microbiocides has been part of the state of the art for some time. These applications are widespread when the products are peroxycarboxylic acids, particularly peracetic acid. When used as biocide, peracetic acid is effective against a wide spectrum of micro-organisms in general, particularly algae, fungi, bacteria and viruses. This biocidal action is due to the strong oxidising power of this product which destroys a large number of components of the cellular membrane thus preventing their chemical/osmotic function and consequently their cellular activity.
Since these microbiocidal properties are well known, the majority of the advances that have occurred in the art relate to improvements either in the formulae of these chemical compounds, aimed at guaranteeing safety of application, stability and effectiveness or in the production process aimed at simplifying the operating technique with a consequent reduction of costs.
It is well known from the state of the art that the use of concentrated solutions of peroxidised products implies the risk of fire, decomposition with liberation of gases, attack on the skin, nasal mucous membranes, etc. It is also known that in a large proportion of the applications in laundries, grape-pressing vats and cooling towers, these products are used in a highly dilute form. However, re-dilution has proved necessary before the product is used by the user, which is undesirable because of the operating risks. Also, this dilution causes a disequilibrium which, as a rule, results in considerable losses of the microbicidal efficiency.
Some patents describe formulations of dilute solutions of peracetic acid, for example, Brazilian patent PI 760 5307 (dated Aug. 8, 1976) describes the preparation of solutions stable in storage with oxidising, bleaching and microbicidal characteristics on the basis of hydrogen peroxide (25.0-40.0% by weight), peracetic acid or perpropionic acid (0.5-20% by weight), stabilisers (up to 1.0% by weight) and surfactants (0.05-5.0% by weight) in which the molar ratio of hydrogen peroxide to peracetic acid and/or acetic acid is between 3.00 and 50.0, i.e. with a molar ratio of peracetic and/or acetic acid to hydrogen peroxide of between 0.02 and 0.33. In accordance with the patent, the disadvantage is avoided of diluting the concentrate which, apart from making the solution unstable during storage, requires strict safety measures during operation. Using phosphonic acids also makes it possible to maintain the stability of the solutions for a relatively long period.
In the same way, patent specification PCT/US87/01147 (dated Aug. 14, 1987) also describes the preparation of stable microbicidal solutions which can be safely transported in boats and which are based on hydrogen peroxide (0.2-8% by weight), peracetic and acetic acid (0.2-11.0% by weight), stabilisers (up to 1.0% by weight) and surfactants (approximately 1.0% by weight) in which the molar ratio of total acid to hydrogen peroxide is between 1.0 and 11.0.
Nevertheless it has been observed that it is perfectly possible to obtain formulations that are safe in transport and application, stable during storage and efficient as regards the microbicidal and oxidising properties.
The main drawback of these processes like that of the others that are part of the state of the art, is the considerable amount of time necessary for the state of equilibrium to be reached in the solutions proposed.
This is due to the fact that the chemical reactions for the formation of organic peroxy acids are equilibrium reactions, which equilibrium is achieved in the diluted solutions over a relatively long period. The reac
REFERENCES:
patent: 4051058 (1977-09-01), Bowing et al.
patent: 4297298 (1981-10-01), Crommelynck et al.
Da Silva Alcides B.
Dadabhoy Jal R.
Tognetti Joao B.
Peroxidos Do Brasil
Rand Scott C.
Raymond Richard L.
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