Chemical apparatus and process disinfecting – deodorizing – preser – For deodorizing of – or chemical purification of – or... – Including solid – extended surface – fluid contact reaction...
Patent
1996-11-15
2000-01-04
Mosher, Mary E.
Chemical apparatus and process disinfecting, deodorizing, preser
For deodorizing of, or chemical purification of, or...
Including solid, extended surface, fluid contact reaction...
422 5, 502 34, 502150, 502300, 502324, 502416, 502417, 502345, 502344, A61L 900, B01J 2030, B01J 2334, A62B 700
Patent
active
060106662
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a deodorizing method based on a polymerization reaction, an oxidization reaction, and adsorption, a deodorizer composed primarily of a metal oxide which performs a catalytic action, a method of manufacturing such a deodorizer, and a deodorizing apparatus which incorporates such a deodorizer.
2. Background Art
Conventional deodorizing methods include a masking process, an adsorption process, an ozone deodorizing process, and a catalytic process which uses a metal oxide.
The masking process vaporizes and disperses an aromatic liquid or solid for people to lose a sense of odors. The adsorption process employs an adsorbent such as activated carbon or the like to adsorb odor components. The ozone deodorizing process serves to decompose odor components with ozone. According to the catalytic process, odor components are oxidized and modified by the oxidizing capability of a metal oxide which is used.
In the masking process, since the aromatic material is eliminated in a short period of time, it has to be replaced periodically and frequently. The adsorption process needs periodic replacement of the adsorbent because the adsorption capacity thereof is limited.
The ozone deodorizing process is capable of producing a deodorizing effect for a long period of time. However, the ozone deodorizing process is expensive to carry out as it requires an apparatus for generating ozone and a catalyst for decomposing excessive ozone. The catalyst needs to be regenerated by heating or the like. Furthermore, if ozone is generated at a concentration higher than a designed level thereby deactivating the catalyst, then the ozone harmful to human beings is likely to leak out of the deodorizing apparatus. When a sulfur-based odor is to be deodorized by the ozone deodorizing process, a trace amount of toxic gas of SO.sub.3 is discharged.
The catalytic process which uses a metal oxide can maintain a deodorizing effect for a long period of time and does not produce hazardous substances. However, the catalytic process may produce other odor components. Specifically, when hydrogen sulfide (H.sub.2 S) and methyl mercaptan (CH.sub.3 SH), which are major components of a fecal odor, are brought into contact with a metal oxide such as MnO.sub.2 or CuO, the methyl mercaptan is dehydrogenated and dimerized into methyl disulfide (CH.sub.3 --S--S--CH.sub.3) which has a lower odor intensity. However, if methyl disulfide is brought into contact with a metal oxide when both hydrogen sulfide and methyl mercaptan are present, then a polymerization reaction occurs which generates methyl trisulfide (CH.sub.3 --S--S--S--CH.sub.3) and methyl tetrasulfide (CH.sub.3 --S--S--S--S--CH.sub.3). These generated substances are as malodorous as methyl mercaptan, and cannot effectively be deodorized.
SUMMARY OF THE INVENTION
To solve the above problems, a deodorizing method according to the present invention, carries out a polymerization reaction for polymerizing malodor components with each other, an oxidization reaction for oxidizing malodor components, and an adsorption reaction for adsorbing malodor components to an adsorbent, simultaneously or stepwise at normal temperature.
Specifically, for deodorizing hydrogen sulfide (H.sub.2 S), it is dehydrogenated, for example, to generate an HS group and an S group. The HS group is further oxidized to generate sulfuric acid (H.sub.2 SO.sub.4), which is bonded to a metal. The S group is polymerized with a CH.sub.3 S group obtained through dehydrogenation of methyl mercaptan as discussed below to generate methyl trisulfide (CH.sub.3 --S--S--S--CH.sub.3) or methyl tetrasulfide (CH.sub.3 --S--S--S--S--CH.sub.3), which is adsorbed to an adsorbent.
For deodorizing methyl mercaptan (CH.sub.3 SH) simultaneously with the deodorization of hydrogen sulfide (H.sub.2 S), it is dehydrogenated, for example, to generate a CH.sub.3 S group. A portion of the CH.sub.3 S group is oxidized to generate methanesulfonic acid (CH.sub.3 SO.sub.3 H), which is bonded
REFERENCES:
patent: 3773044 (1973-11-01), Wallace
patent: 4572178 (1986-02-01), Takase et al.
patent: 5292479 (1994-03-01), Haraga et al.
patent: 5568230 (1996-10-01), Reddy et al.
Kobayashi Chihiro
Kurokawa Tetsuya
Tokumoto Tomonori
Tsuchida Takashi
Yamamoto Masahiro
Blackman William D.
Carrier Joseph P.
Mosher Mary E.
Toto Ltd.
LandOfFree
Deodorizing method, deodorizer, method of manufacturing deodoriz does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Deodorizing method, deodorizer, method of manufacturing deodoriz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deodorizing method, deodorizer, method of manufacturing deodoriz will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1070253