Compositions – Preservative agents – Anti-corrosion
Patent
1992-06-17
1994-04-12
Stoll, Robert L.
Compositions
Preservative agents
Anti-corrosion
422 13, C23F 1112
Patent
active
053023218
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a method of preventing the occurrence of corrosion in pipes and devices of steam and condenser systems.
BACKGROUND ART
In steam generating apparatuses, such as boilers and concentration cans, the metal in contact with steam and condensed water may corrode due to feed water-containing oxygen and components of M-alkalinity. Regarding to condenser systems in particular, carbon dioxide generated together with steam in boilers and the like dissolves again in water at condensation of steam, leading to the decrease in pH of condensed water (condensation), which frequently causes severe corrosion of pipes and devices. As the methods to prevent such corrosion, there has been conventionally carried out the chemical process with strong basic-type amines such as morpholine and long-chain aliphatic amines such as octadecyl amine, besides the processes of ion exchange and degassing for the objective to degass carbonate in feed water.
In case that the steam generated in boilers is to be used for food processing and the production process of pharmaceutical agents and for humidification of air conditioning of buildings, a high degree of hygienic safety is required for steam. Some of the amine-type chemical agents described above have received approval for their use as the additives for boilers from U.S. FDA Standards, but the objectives of the utility of generated steam have been limited and the concentration of the agents in steam also has limitation. Additionally, they are not necessarily satisfactory in terms of safety. Hence, even in the case that some concerns about the corrosion of pipes and devices of steam and condenser systems may be present, steam is used without chemical processing, in order to ensure safety.
DISCLOSURE OF THE INVENTION
The present invention is thus to provide an anticorrosive method of steam and condenser systems, capable of providing sufficient ensuring of hygienic safety.
The present inventors have carried out investigations so as to achieve the above objectives, and have found that vitamin A and vitamin E, among vitamins as the organic substances inevitable for maintaining normal growth and nutritious state of animals, have anticorrosive effect on steam and condenser systems. That is, the present invention is an anticorrosive agent of steam and condenser systems, containing vitamin A or E as the effective component thereof, and an anticorrosive method of steam and condenser systems wherein at least one compound selected from the group consisting of vitamin A and vitamin E is added to the systems.
The vitamin A to be used in the present invention is;
(a) vitamin A compounds including vitamin A.sub.1 (retinol), vitamin A.sub.2, vitamin A.sub.3, etc., or
(b) the derivatives of the vitamin A compounds described above, including vitamin A aliphatic acid ester, vitamin A acid, vitamin A aldehyde, etc., and they may be natural products or synthetic products, or those containing such compounds or derivatives, for example, fatty oil obtained from liver and pyrolus uvula of marine animals.
The vitamin E to be used in the present invention is represented by so-called tocopherol and its analogs, including for example, .alpha.-tocopherol, .beta.-tocopherol, .gamma.-tocopherol, .delta.-tocopherol, .alpha.-tocotorienol, .beta.-tocotorienol, .gamma.-tocotorienol, .delta.-tocotorienol, etc. As in vitamin A, oils containing such compounds, for example, germ oil and soybean oil, may be also included.
These vitamins A and E are those incorporated as nutritious components on daily basis into humans, and are substances in a wide range of general use as supplementary products for nutritious foods or additives for milk products, flour, baby foods, condensed and dried soup stocks, curry roux, confectioneries, etc. Vitamins A and E as such are thoroughly investigated of their safety including the effects on human body, so they can appropriately be used in the case that safety of steam is important as described above.
The anticorrosive mechanism is not clear i
REFERENCES:
patent: 4278683 (1981-07-01), Stotefuss et al.
patent: 4569783 (1986-02-01), Muccitelli
patent: 5094814 (1992-03-01), Soderquist et al.
patent: 5108624 (1992-04-01), Bossler et al.
Akama Shunichi
Sasa Takanobu
Yanagisawa Tokuko
Aquas Corporation
Fee Valerie
Stoll Robert L.
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