Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Organic component
Patent
1996-06-26
1999-01-12
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Organic component
422168, 422177, 422178, 126 16, 126299F, 55DIG36, B01D 5344, F24C 1520
Patent
active
058583165
DESCRIPTION:
BRIEF SUMMARY
This application is the national U.S. stage of parent case PCT/EP94/02796, filed Aug. 24, 1993.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention deals with a process and a device for the removal and oxidation of organic substances from kitchen vapor contained in an extracted air stream by utilizing a ventilator generating the extracted air stream in an extracted air channel, a filter adsorbing the organic substances and a heated catalyst performing the catalytic oxidation of the organic substances.
2. Description of the Prior Art
Kitchen vapor which, in a broader sense, includes vapor generated during the manufacture and preparation of food stuff and food, for example, by bakeries or chocolate manufacturers, contains mostly organic substances which can become, depending on their concentration and the location of their emission point, a real nuisance to the surrounding area due to their smell, and can lead to other undesirable manifestations, such as, for example, deposits accompanied by mold formation.
For this reason efforts are made to capture the vapor, preferably by extracting it, and to channel the extracted air carrying the vapor through filters, among other methods, in order to remove organic substances. However, the absorption capacity of each and every filter is limited, so that, as it becomes saturated, it works less effectively and may even cease to function altogether. Filter replacement is laborious and costly, and can present a waste disposal problem.
From the German patent disclosure document 23 63 820, a device is known which channels extracted air carrying organic substances immediately following prefiltering through a heated catalyst, located upstream of a filter and a ventilator, for catalytic oxidation of the organic substances. This device has the disadvantage that the catalyst has to be heated continuously as long as the ventilator is running and supplying polluted extracted air. In order to be effective catalysts are generally provided with a large specific surface area which, however, entails transmission of energy to the extracted air stream as it flows through the catalyst, especially when the extracted air carries steam. The expenditure of energy and the costs associated with keeping the catalyst continuously at operating temperature are correspondingly high. In addition, the organic substances in the extracted air stream, occurring generally in only relatively low concentrations, can contribute only insignificantly to the heating of the catalyst through their exothermal oxidation, because of the high flow rate of extracted air.
SUMMARY OF THE INVENTION
The object of the invention is therefore to embody and further develop the process and the device of the type described previously, in a manner that reduces the energy expenditure for extracted air purification.
According to the invention the filter is regenerated through input of heat, and the catalyst is heated only during limited time periods, thereby conserving energy when catalytically oxidizing the organic substances. This can be accomplished by diverging from the state of the art, in that the organic substances of the kitchen vapor are not continuously subjected to catalysis, but are first adsorbed in and temporarily stored by the filter, then converted from time to time in the heated catalyst following desorption of the organic substances from the filter by application of heat, a process which requires the filter to be positioned upstream of the catalyst.
Desorption of the filter takes place at the latest when the filter is saturated with organic substances. The catalytic oxidation of the organic substances takes place at the same time, preferably when the kitchen is idle, for example, at night.
The catalytic oxidation of organic substances which were previously adsorbed and accumulated in a filter clearly requires less time and energy, because of the more concentrated conversion process, than the one which, in keeping with the state of the art, has to be operated continuously as long as the organi
REFERENCES:
patent: 2658742 (1953-11-01), Suter et al.
patent: 4235220 (1980-11-01), Hepner
patent: 4985210 (1991-01-01), Minami
patent: 5140811 (1992-08-01), Minami
English Translation of DE 23 63 820 A, Jun. 1975.
English Translation of JP 5-96, 178 A, Apr. 1993.
Berndt Malte
Meister Martin
Straub Gary P.
Vanoy Timothy C
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