Gas separation: processes – Solid sorption – Inorganic gas or liquid particle sorbed
Patent
1997-05-05
1998-12-29
Hruskoci, Peter A.
Gas separation: processes
Solid sorption
Inorganic gas or liquid particle sorbed
96108, 96111, 210660, 210767, 210807, 210266, 210 961, B01D 5366
Patent
active
058534571
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter material and to a process for removing ozone from gases and liquids, in which a gas stream or a liquid is brought into contact with a filter material made of unsaturated cycloolefin homopolymers or copolymers.
DESCRIPTION OF THE PRIOR ART
It is known that small amounts of ozone are formed during electrophotographic copying and printing processes. The ozone formed is permanently given off into the surrounding air by the appliances used, for example photocopiers or laser printers. Ozone is a nuisance not only owing to its odor, but it is harmful to health even at low concentrations. To remedy this situation, a multiplicity of processes have been developed which describe the removal of ozone from the air stream released from such apparatuses. In these processes, the ozone is either destroyed or chemically or physically bound.
Destruction of the ozone by heating or by interaction with a metal catalyst is disclosed (cf. JP 60/197 223 and JP 60/19 115). However, disadvantages of the thermal destruction of ozone are the energy requirement and the high temperature, both of which are necessary for complete ozone destruction.
It is further disclosed to pass the gas stream through a filter in which the ozone is catalytically decomposed (cf. JP 58/081 425). The base material of the filter is impregnated with one or more metal compounds, metals or alloys, for example iron compounds, manganese compounds or nickel compounds, to which is further added a compound or a metal selected from the group consisting of the noble metals, for example palladium or platinum. These catalysts are highly expensive and generally have only a restricted service life, since such heterogeneous catalysts are rapidly deactivated by various catalyst poisons.
A filter comprising a support material made of aluminum oxide or activated carbon which is impregnated with ethylenically unsaturated compounds which react with the ozone is also disclosed (cf. DE 37 28 802). It is a disadvantage that the compounds, for example terpenes, depending on the support material, are volatile in many cases, that is can be discharged in small amounts and thus are lost. Furthermore, only a small portion of the filter weight is available as active constituent.
In addition, a filter for ozone decomposition is disclosed which consists of a fiber plate whose fibers contain an ozone-decomposing catalyst (cf. JP 03/270 718). These fibers, which in a preferred embodiment are porous, consist of a polymer having one of the following functional groups which react vigorously with ozone, e.g. --SH, .dbd.S, --NH.sub.2, .dbd.NH, --CN and --OH. Ozone-decomposing catalysts mentioned are metals, such as gold, silver, copper, palladium, iron, nickel, cobalt and manganese, or their oxides, and also alumina and kiesel-guhr. The fiber required for producing the filter is obtained by a conventional spinning process, the catalyst being dispersed in the spinning solution and being uniformly distributed in the fiber after spinning. By adding a second polymer which, together with the first polymer, causes a phase separation, and various post-treatments of the spinning product, a porous phase is obtained which contains the catalyst particles. The resulting fibers are then made into the filter by conventional methods. Apart from the fact that the polymers considered to be suitable are only mentioned en bloc--only polyacrylonitrile is disclosed--preparation of the filters is laborious and highly complex.
SUMMARY OF THE INVENTION
The object of the invention was therefore to provide a filter and a process for ozone removal in which said disadvantages do not occur.
The invention relates to a filter material for removing ozone from gases and liquids, in which the filter material comprises an unsaturated cycloolefin homopolymer or cycloolefin copolymer.
The invention also relates to a process for removing ozones from gases, in which a filter material which comprises an unsaturated cycloolefin homopolymer or cycloolefin copolymer having repeating units based on t
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Eysmondt Jorg
Osan Frank
Schleicher Andreas
Hruskoci Peter A.
Ticona GmbH
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