Chemical apparatus and process disinfecting – deodorizing – preser – For deodorizing of – or chemical purification of – or... – Including solid – extended surface – fluid contact reaction...
Patent
1996-07-29
1998-11-03
Thornton, Krisanne
Chemical apparatus and process disinfecting, deodorizing, preser
For deodorizing of, or chemical purification of, or...
Including solid, extended surface, fluid contact reaction...
55524, 55527, 422120, A62B 708
Patent
active
058304142
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high performance air cleaning filter which can effectively clean contaminated environmental air containing very low concentrations of pollutants.
BACKGROUND ART
In the present state where cleaning of the earth's environment has been a big problem, the control and prevention of air pollution in particular has been an urgent matter to be solved, and the cleaning of air which contains low concentrations of pollutants has been strongly demanded in every environment including working environments in various industries and living environments.
Conventionally, although dry processes and wet processes have been known for cleaning air, a dry process employing activated carbon has been practically used for a long time due to its simplicity. Also various air cleaning agents which exhibit selective adsorption capabilities according to the kinds of polluting gases have been developed; for example, a porous carrier supporting a base or an acid chemical is regarded as effective for removing an acid or a basic gas. Particularly, an air cleaning agent comprising a carrier supporting an oxidizing agent or a reducing agent has been widely used in industry since it has such a cleaning capacity that the polluting gas is decomposed by the strong oxidizing/reducing power.
Among such air cleaning agents are an agent comprising a carrier such as activated alumina or zeolite, supporting potassium permanganate (Japanese Patent Laid-Open Nos. 60-827, 3-23863 and the like), an agent comprising an activated carbon supporting an iodate and/or an inorganic acid (Japanese Patent Laid-Open Nos. 61-68136, 62-161372, and 62-161373) and the like.
Also an air cleaning agent which comprises an activated carbon honeycomb supporting iodine and inorganic iodide has been known (EP-052077A1).
An air cleaning agent which comprises activated carbon fibers supporting a MnO type chemical agent and which removes the bad smell of aldehydes and the like is also known (Japanese Patent Laid-Open No.3-288545).
These air cleaning agents have been brought into actual use according to applications, but each agent has its own merits and demerits, and there are problems that the uses may be limited due to the inherent physical properties of each agent. For example, an air cleaning agent of potassium permanganate type is a soluble and strong oxidizing agent, thus is highly dangerous requiring great caution in its handling. Accordingly it cannot be used in consumer products for ordinary household environments. Though the activated carbon is very safe during use, since the removal mechanism is based on physical adsorption, the degree of polluting gas removal is naturally restrained. Further, when saturated, it loses the adsorption activity and even exhibits desorption phenomenon. Accordingly, in most cases, the activated carbon is used by supporting a chemical agent, but still it cannot be expected to have a long working life and a high capacity for removing the polluting gas of a low concentration.
PROBLEMS TO BE SOLVED BY THE INVENTION
Recently, for the purpose of improving the product precision and the yields in the production of precision electronics including semiconductors, or for the purpose of allowing permanent storage of high-quality art such as paintings without causing discoloration, it has been eagerly desired to develop an air cleaning agent which is safe, easy to handle and can remove polluting gas of a low concentrations completely and easily.
The present invention has been developed as a result of an intensive study in view of the above-mentioned demand, and it is aimed at providing an air cleaning filter which is safe, has a long working life, a sufficient capacity for removing a polluting gas of low concentrations, and which has such a structure that it can be easily installed.
DISCLOSURE OF THE INVENTION
To achieve the above-mentioned objects the air cleaning filter of the present invention comprises a carrier made of activated carbon fibers in the form of a web which supports one kind o
REFERENCES:
patent: 4200609 (1980-04-01), Byrd
patent: 5124856 (1992-06-01), Brown et al.
patent: 5302354 (1994-04-01), Watvedt et al.
patent: 5344626 (1994-09-01), Abler
patent: 5607647 (1997-03-01), Kinkead
patent: 5626820 (1997-05-01), Kinkead et al.
Hashimoto Michinori
Ichimura Shozo
Ishii Tsutomu
Karibe Fumio
Shimamura Tetsuo
Cambridge Filter Japan, Ltd.
Kondoh Industries Limited
Nippon Chemical Industrial Co. Ltd.
Thornton Krisanne
Unitika Ltd.
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