SE190885C1

SE190885C1 -

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Publication number: SE190885C1
Authority: SE
Publication date: 1964-01-01

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KLASS I NTERNATI ONELLSVENSK B 01 d12 e:3/02 PATENT- OCH REGISTRERINGSVERKET Ans. 9917/1956 inkom den 1/11 1956 utlagd den 23/12 1963 C-R E RINGSTROM, STOCKHOLM Satt for avlagsnandet av svavelhahiga fororeningar av storleksordningen -8 och lagre procent ur luft Den minsta halt av svavelvdte, som behovs for att sa smaningom svarta en blank silveryta och clarified fororsaka skada, t. ex. pa elektriska kontakter, är av storleksordningen -18 %, ehuru svartningen darvid tager avsevard tid. Relativt hastig warbling (1 dr)‘ torde man fa rakna med om halten är av storleksordningen -8 %. Om man rum luften enligt hittillsvarande metoder med filter innehallande aktivt kol, kiselgel e. d finner man, att den renade luftens halt av gasfororening blir proportionell mot den i filtret sammanlagda adsorberade gasmangden. For att uppna en renhet av -8 % I-12S hos stOrre mangder luft skulle man salunda yam tvungen att tillgripa orimlist stora adsorptionsfilter. I dessa filter fastna dessutom en mangd andra gaser och angor, som dro ofarliga for silver eller t. o. m. verka inhiberande pa svavelforeningars angrepp pa silver, vilket ytterligare gOr att de sa snabbt forbrukas. CLASS I NTERNATI ONELLSVENSK B 01 d12 e: 3/02 PATENT AND REGISTRATION AGENCY Ans. 9917/1956 was received on 1/11 1956 issued on 23/12 1963 CR E RINGSTROM, STOCKHOLM Set for the removal of sulfur-containing pollutants of the order of -8 and lower percent from air silver surface and clarified cause damage, e.g. on electrical contacts, is of the order of -18%, although the blackening takes considerable time. Relatively fast warbling (1 dr) ‘should probably be straightforward if the content is of the order of -8%. If the air is accommodated according to hitherto methods with filters containing activated carbon, silica gel, etc., it is found that the content of gas pollutant in the purified air becomes proportional to the total amount of adsorbed gas in the filter. In order to achieve a purity of -8% I-12S in larger amounts of air, one would thus have to resort to extremely large adsorption filters. In addition, a number of other gases and fumes are trapped in these filters, which are harmless to silver or even have an inhibitory effect on sulfur compounds' attack on silver, which further means that they are consumed so quickly.

Den svavelaktivitet man i praktiken kan tilllata i luften ar en funktion av metallforemalets, t. ex. silverkontakters anyandningssatt. Om del exempelvis ãr fragan om ett rela med silverkontakter, vilket arbetar sallan (nagra ganger i manaden), blir den mekaniska avnotningen mycket liten, vilket innebar att endast en langsam tillvaxt av silversulfid kan tillatas. Vid ett reld med intensiv belastning (t. ex. varannan sekund) blir den mekaniska avn8tningen stor, och hastigare tillvaxt av svavelsilverskikt kan tillatas och and& hailer avnotningen kontaktpunkten blank. Den tillatna svavelaktiviteten varierar darfOr mycket for olika typer av metallforemal. The sulfur activity that can in practice be allowed in the air is a function of the metal form, e.g. silver contacts any breathing set. For example, if part is the question of a relay with silver contacts, which works the hall (a few times a month), the mechanical wear and tear will be very small, which meant that only a slow growth of silver sulphide can be allowed. In the case of a fire with an intense load (eg every other second), the mechanical wear becomes large, and faster growth of the sulfur-silver layer can be allowed and the wear contact point becomes blank. The permissible sulfur activity therefore varies greatly for different types of metal molds.

Tack vare att silver är en oddel metall som i luft overdrager sig med en tunn film av silveroxid, kan man i samband med sattet enligt Dupl. kl. 26 d: 8/04 uppfinningen anvanda filter som konstrueras pa foljande sat: Tradar eller band av metall eller annat material belaggas med ett tunt lager av metalliskt silver. Detta trad- eller band-material flatas till mattor, i vilka fall dessa utgora sjalva filtret eller fylles i form av trassel, tradklipp eller span i med galler forsedda, eventuellt genomskinliga trummor, lador eller kassetter. Filtren skall vara atkomliga for inspektion och fornyelse. Thanks to the fact that silver is a base metal which in air is coated with a thin film of silver oxide, it is possible in connection with the set according to Dupl. at 26 d: 8/04 invention using filters constructed as follows: Trades or strips of metal or other material are coated with a thin layer of metallic silver. This wire or strip material is flattened into mats, in which case they form the filter itself or are filled in the form of tangles, wire cutters or spans in grids, possibly transparent drums, barns or cassettes. The filters must be accessible for inspection and renewal.

Effekten av ett dylikt filter i de laga fororeningshalter av storleksordningen -8 och lagre proccnt, som har komma ifraga, begransas av fororeningsgasens diffusion i luften och icke av adsobtionshastigheten i filtermassan och blir salunda beroende pa filtrets maskstorlek, den genomstrommande luftens hastighet och temperatur. The effect of such a filter in the low pollutants of the order of -8 and lower percentages which have come into play is limited by the diffusion of the pollutant gas in the air and not by the adsorption rate in the filter mass and thus depends on the filter mesh size, velocity of air flow and temperature.

Den renhet, som kan uppnas vid de hittills industriellt anvanda metoderna for rening av gaser, exempelvis haft, t. ex. med gilidande kopparspan, blysockerlosning eller myrmalm, är Idngt ifran total. Da det galler skydd av elektriska kopplingsutrustningar mot svavelfororeningar ha de mest skilda atgarder tillgripits. Stora telefonforvaltningar har till valdiga kostnader t. o. m. tvingats overga fran silverkontakter till kontakter av palladium, vilka i vissa avseenden dessutom aro samre an silverkontakter. Det liar emellertid icke lyckats att filtrera bort de sista resterna av svavel ur luften, dvs. fOroreningar av storleksordningen -8 och lagre procent. De kontinuerliga svarigheterna att hcTlla silverkontakterna rena kvarstod darfor. Man har forsOkt att ktivera» kiselgel med kalium-dimetylglycin och rekommenderat denna produkt for total svavelrening. Praktiska och laboratoriemassiga f Orsok liksom enkla berakningar visar emellertid 2— — att en sadan produkt ej kan rena tekniskt erf orderliga kvantiteter luft till tillracklig renhet. I ett annat liknande projekt i storre skala her man byggt stora filteranlaggningar med dyrbara aktiva kolfilter for telefonstationer. Aven dar har praktiken verifierat teorin att det ej gar att rena praktiskt erforderliga kvantiteter luft med aktivt kol till nodvandig renhetsgrad. The purity which can be achieved by the hitherto industrially used methods for purifying gases, for example had, e.g. with gilidande copper span, lead sugar solution or bog ore, Idngt ifran total. As it concerns the protection of electrical connection equipment against sulfur pollutants, the most diverse measures have been resorted to. Large telephone administrations have, at great expense, even been forced to switch from silver contacts to palladium contacts, which in some respects are also more common than silver contacts. However, it has not been possible to filter out the last residues of sulfur from the air, ie. Pollutants of the order of -8 and lower percentages. The continuous responsibilities of keeping the silver contacts clean therefore remained. Attempts have been made to activate silica gel with potassium dimethylglycine and this product has been recommended for total sulfur purification. Practical and laboratory reasons, as well as simple calculations, however, show that such a product cannot purify technically required quantities of air to a sufficient purity. In another similar project on a larger scale, large filter systems were built here with expensive activated carbon filters for telephone stations. In addition, practice has verified the theory that it is not possible to purify practically required quantities of air with activated carbon to the required degree of purity.

Det är ants kant att rena gas fran industriellt eller laboratoriemassiga hoga halter av svavel genom att passera den Over upphettad koppar. Det är ocksa kant att sulfidbildningen sker i sulfidens mot gasen vanda yta, dvs. att metalljonerna maste diffundera genom sulfidskiktet. Om joke metallen uppvarmes sker namligen diffusion av metall mot ytan for langsamt. Den hoga temperaturen innebar tva saker, dels yore det meningslost att tilllampa. den i luft med en syrehalt vasentligen hOgre an svavelvatehalten eftersom det da icke skulle bli fra.ga om ett svavelvatefilter utan en gasforbranningsanlaggning (i sjalva Terket skulle en sadan metall som t. ex. koppar dessutom oxideras), dels stiger dissociations-. trycket Over alla sulfider hastigt med temperaturen sA alt alien vid fullstandig j amvikt en-. dast mattlig svavelrenhet kan uppnas pa delta satt. It is ants edge to purify gas from industrially or laboratory high levels of sulfur by passing it Over heated copper. It is also an edge that the sulphide formation takes place in the surface of the sulphide against the gas, ie. that the metal ions must diffuse through the sulphide layer. If the joke metal is heated, diffusion of metal to the surface takes place too slowly. The high temperature meant two things, on the one hand it was pointless to light a lamp. it in air with an oxygen content substantially higher than the sulfur water content because then there would be no question of a sulfur water filter without a gas combustion plant (in Terket itself, such a metal as, for example, copper would also be oxidized), and dissociation increases. pressure Over all sulfides rapidly with temperature sA alt alien at complete equilibrium en-. only moderate sulfur purity can be achieved in this way.

Enligt lagen om gasers diffusion i varandra ãr relativa diffusionshastigheten a.v en gasfororening i en annan gas hi. a. proportionell mot molekyltatheten av fororeningsgasen eller med andra ord den absoluta diffusionshastigheten är proportionell mot fororeningshalten I kvadrat. Svavelvatets diffusion i gasfasen ár vid de tekniska halterna i intervallet -2 till -7 stor i forhallande till diffusionen i de olika filtermassor som hittills anvandes. Detta ar anledningen till att man i gangse filter efterstravar Inigsta mojliga diffusionshastighet hos filtermassan och foljdriktigt anvander vattenlosningar eller vattenuppslamningar t. ex. av blyacetat, eller ocksa en upphettad metall t. ex. koppar. According to the law on diffusion of gases into each other, the relative diffusion rate of a gas pollutant in another gas is hi. a. proportional to the molecular density of the pollutant gas or in other words the absolute diffusion rate is proportional to the pollutant content I square. The diffusion of the sulfur water in the gas phase at the technical levels in the range -2 to -7 is large in relation to the diffusion in the various filter masses used so far. This is the reason why ordinary filters strive for the highest possible diffusion rate of the filter mass and use aqueous solutions or water slurries, e.g. of lead acetate, or also a heated metal e.g. copper.

Uppgif ten for sattet enligt uppfinningen borjar emellertid forst vid halten av svavelvate av storleksordningen -8 a -9, dar absoluta diffusionshastigheten i gasfasen salunda fir 10010000 ganger mindre an dar motsvarande vfirden i gangse filter slutar. mom detta omrade kommer diffusionen av metalljoner i den fasta sulfidfasen i filtermassan att ske fortare an diffusionen i gasfasen, vilket salunda fir den teoretiska forklaringen till att ett filter av t. ex. metalliskt silver kan anvandas vid svavelhalter vid ftiroreningar av storleksordningen under men icke Over -8. However, the task of the set according to the invention begins only at the content of sulfur water of the order of -8 a -9, where the absolute diffusion rate in the gas phase is thus 1000000 times less than when the corresponding value in ordinary filters ends. In this area, the diffusion of metal ions in the solid sulphide phase in the filter mass will take place faster than the diffusion in the gas phase, which thus leads to the theoretical explanation that a filter of e.g. metallic silver can be used at sulfur contents for compounds of the order of below but not above -8.

Mot denna bakgrund utgor ett satt med den avsedda reningsgraden en ny teknisk 18sning av mycket stor praktisk betydelse. Det nya sattet kan hi. a. tillampas overallt dfir utrustningar finns som innehaller elektriska silverkontakter, exempelvis i automatiska telefonstationer eller i andra elektriska kopplingscen traler innehallande silverkontaktdon. Sattet har dock lika stor betydelse for luftrening i andra sammanhang sasom t. ex. i museer innehallande monter med silverf8remal, juvelerarebutiker m. m. Against this background, a set with the intended degree of purification constitutes a new technical solution of very great practical importance. The new set can hi. a. Applied everywhere dfir equipment is available that contains electrical silver connectors, for example in automatic telephone stations or in other electrical switchboards containing silver connectors. However, the set is just as important for air purification in other contexts as e.g. in museums containing stands with silver f8remal, jewelery shops m. m.

Pioblemet att avlagsna laga svavelhaltiga fororeningar loses enligt uppfinningen genom att valja ett satt, dar luften ledes genom ett filter som innehaller nagot silver, t. ex. i form av rent silver eller silverplaterad koppar sa att svavelvate eller andra t. ex. organiska svavelforeningar sasom merkaptaner utfalles som en. nybildad fas med en svavelaktivitet av ovannamnda storleksordning eller lagre for att skydda foremal bestaende av silver i rent, legerat eller platerat skick. The problem of removing low sulfur-containing pollutants is solved according to the invention by choosing a set, where the air is passed through a filter containing some silver, e.g. in the form of pure silver or silver-plated copper so that sulfur cotton or other e.g. organic sulfur compounds such as mercaptans are precipitated as one. newly formed phase with a sulfur activity of the above-mentioned magnitude or layers to protect objects consisting of silver in pure, alloyed or plated condition.

Sattet enligt uppfinningen illustreras narmare i samband flied figurerna, a vilka fig. 1 visar ett diagram for hur reningen fortskrider da fororenad luft passerar ett filter, fig. 2-6 exempel pa nagra luftreningsfilter som kunna anvandas i samband med sattet samt fig. 7-9 olika satt att anordna filtermaterial i reningsfiltren som lampa sig for utforandet av sattet enligt uppfinningen. The set according to the invention is illustrated in more detail in connection with the figures, in which Fig. 1 shows a diagram of how the purification proceeds when polluted air passes a filter, Figs. 2-6 are examples of some air purification filters which can be used in connection with the set and Fig. 7- 9 different ways of arranging filter material in the purification filters which are suitable for carrying out the set according to the invention.

I fig. 1 betyder abscissan tiden t och ordinatan S svavelhalten i luften, uttryckt i delar/ delar luft, hada varden i logaritmisk skala. I diagrammet visas reningsforloppet i med H2S fororenad luft med borjan. vid 1 visande luftens halt av H2S vid inkomsten i ett filter och vid 2 den ur filtret utgaende luftens halt av H2S. In Fig. 1, the abscissa means the time t and the ordinate S the sulfur content in the air, expressed in parts / parts of air, had the value on a logarithmic scale. The diagram shows the purification process in H2S-polluted air with the beginning. at 1 showing the air content of H2S when entering a filter and at 2 the air content of H2S emanating from the filter.

Vid en ruling enligt detta satt kan filter anvandas, vilka om de gams tillrackligt tjocka eller om luften passerar desamma tillrackligt sakta, astadkommer praktiskt taget obegransat hog Felling av luft fran svavelvate (-16 %). Luften renas icke bare fran svavelvate, utan aven fran alla andra i luften forekommande gaser, som kunna angripa silver, t. ex. ozon. Enligt uppfinningen adsorberas endast for silver farliga gaser genom ail filtermaterialet i de for sattet anvanda filtren ar detsamma som det material som skall skyddas och forbrukas dfirfor icke i onodan av andra i detta sammanhang oskadliga gaser. In a ruling according to this method, filters can be used which, if the vultures are sufficiently thick or if the air passes them sufficiently slowly, achieve practically unlimited hog Felling of air from sulfur water (-16%). The air is purified not only from sulfur water, but also from all other gases present in the air, which can attack silver, e.g. ozone. According to the invention, gases which are dangerous for silver are adsorbed only through all the filter material in the filters used for the same purpose as the material to be protected and are therefore not consumed unnecessarily by other gases which are harmless in this context.

Fig. 2 visar schematiskt ett reningsfilter av typen kassett, fig. 3 ett reningsfilter i form av en trumma fylld med filterband, fig. 4 en filtermatta, fig. 5 ett filter i pasform och fig. 6 ett filter med filtermaterialet lindat kring en bobin i en ram. Fig. 2 schematically shows a purification filter of the cassette type, Fig. 3 a purification filter in the form of a drum filled with filter tape, Fig. 4 a filter mat, Fig. 5 a filter in a fit and Fig. 6 a filter with the filter material wound around a bobbin in a frame.

Fig. 7-9 antyda schematiskt olika filtermaterial och deras stapling i filtren. Figs. 7-9 schematically indicate different filter materials and their stacking in the filters.

I samtliga figurer visa mot filtren riktade pilar den fororenade luftens instromningsriktning mot filtren och pilar riktade utat fran filterkroppen, den renade luftens utstromningsriktning. In all figures, arrows directed towards the filters show the inflow direction of the polluted air towards the filters and arrows directed outwards from the filter body, the outflow direction of the purified air.

Fig. 2 visar ett filter som kassett med en fyrkantig ram 3, Over vars bagge appna sidor — —3 galler 4 dro spanda. Kassetten är fylld med filtermassa, vilken fastkldmmes i godtycklig anordning mellan gallren. Fig. 2 shows a filter as a cassette with a square frame 3, over whose ram the sides - —3 grid 4 pulled bucket. The cassette is filled with filter mass, which is clamped in any device between the grids.

I fig. 3 ãr filtret utformat som en cylindrisk gallertrumma 5, i Tars inre den fororenade luften kan stromma in. I halcylinderns vagg är filtermaterialet 6 inpressat i godtyeklig an- ordning. Den renade luften uttrader genom cylinderns yttervagg. In Fig. 3, the filter is designed as a cylindrical grid drum 5, in the interior of the tar the polluted air can flow in. In the cradle of the half-cylinder, the filter material 6 is pressed into any device. The purified air exits through the outer wall of the cylinder.

Enligt fig. 4 ãr band- eller tradformigt filtermaterial 7 flatat i mattor med fastsattning i lampliga ytterramar 8. Inga galler finnes. According to Fig. 4, strip-shaped or wire-shaped filter material 7 is flattened in carpets with fastening in suitable outer frames 8. There are no gratings.

Enligt fig. 5 är filtret utformat som en tygpase 9, fylld med filtermaterial 10. Den renade luften utstr8mmar at alla hall vinkelrat mot instromningsriktningen. According to Fig. 5, the filter is designed as a fabric pass 9, filled with filter material 10. The purified air flows out of all halls perpendicular to the inflow direction.

I filtret enligt fig. 6 ar band- eller tradformigt filtermaterial 11 lindat kring en bobin 12, anordnad mom en ytterram 13. Med 14 betecknas en fastsattningsram. In the filter according to Fig. 6, strip-shaped or wire-shaped filter material 11 is wound around a bobbin 12, arranged with an outer frame 13. A fastening frame is denoted by 14.

I fig. 7-9 antydes hur filtermaterial ph tre olika satt kan placeras i ringformiga filter 15, 16, 17. I fig. 7 är filtermaterialet, t. ex. s. k. julgransglitter, anordnat I parallella strimlor 18 1 luftens genomstromningsriktning, i fig. 8 aro band eller tradar 19 anordnade i vinkel mot, foretradesvis rat vinkel, mot luftens ge- nomstromningsriktning. Slutligen är i filtret enligt fig. 9 materialet 20 trasselformigt instoppat i filtret pa godtyekligt salt. Med 21a, 21b betecknas trattformiga till- resp. avloppskroppar som breda ut luften likformigt framfor och hakom sjalva filtret. In Figs. 7-9 it is indicated how filter material ph can be placed in annular filters 15, 16, 17 in three different ways. In Fig. 7 the filter material, e.g. so-called Christmas tree glitter, arranged in parallel strips 18 in the flow direction of the air, in Fig. 8 a bands or threads 19 are arranged at an angle to, preferably at an angled angle, to the direction of flow of the air. Finally, in the filter according to Fig. 9, the material 20 is tangled in the filter of any salt. 21a, 21b denote funnel-shaped additions resp. drain bodies that spread the air uniformly in front and hook the filter itself.

Filter av den i fig. 7-9 avbildade typen kunna enkelt kombineras till »batterier av ett teoretiskt obegransat — antal enheter, varvid drift alltid det filter som är narmast den instrommande fOrorenade luften, utbytes forst mot ett nytt filter. Filters of the type shown in Figs. 7-9 can easily be combined into batteries of a theoretically unlimited number of units, whereby always operating the filter closest to the inflowing polluted air is first replaced by a new filter.

Filtren aro optiskt sjalvindikerande ph sâ satt att de fran att fran b8rjan vara silvervita skifta farg over gult-blatt till svart eller, da man liar mycket tunna silverhinnor, till flagon annan latt igenkannbar farg. Sistnamnda farg visar att filtret Or forbrukat. Anda tills det ãr helt forbrukat har ett homogent packat filter samma effektivitet som da det Or nytt. The filters are optically self-indulgent ph so set that from the beginning they are silvery white, change color over yellow-blue to black or, when you have very thin silver membranes, to a flag of another easily recognizable color. The latter color indicates that the filter Or is consumed. Spirit until it is completely consumed, a homogeneously packed filter has the same efficiency as when it Or new.

Regenerering air filtren kan ske snabbt och bekvamt genom elektrolys t. ex. i natronlut och sodalosning med efterfoljande skoljning i vatten. For att forenkla forfarandet vid regenereringen kan man frill borjan blanda det f8rsilvrade filtermaterialet med en mindre mangd span av zink, magnesium, aluminium eller dylikt. DO filtret sedan f8r regenerering nedsankes i sodalosning uppstar elektrolys spontant utan yttre stronatillforsel tack vare att galvaniska element bildas. Anvandande av pa sh satt komponerat filtermaterial forenklar och forbilligar filtrets ekonomi. For att kunna anvanda sadana filter fordras att filtret i drift Mlles torrt. Regeneration of air filters can be done quickly and conveniently by electrolysis e.g. in baking soda and soda solution with subsequent rinsing in water. To simplify the process of regeneration, one can initially mix the silver-filtered filter material with a smaller amount of zinc, magnesium, aluminum or the like. Since the filter is then immersed in soda solution before regeneration, electrolysis arises spontaneously without external strona supply due to the formation of galvanic elements. The use of filter material composed in this way simplifies and reduces the economy of the filter. In order to be able to use such filters, the filter in operation must be kept dry.

Angrepp av svavelhaltig luft pa nysilver, koppar, massing och brons och liknande me- taller kunna enligt uppfinningen undvikas pa samma satt med silverfilter, anordnat i trummor, lador eller kanister, i form av tradar, band eller trasseL DO det galler dessa metaller, kan man Oven tanka sig att anvanda filter med mindre stark reaktionsformaga an silver, t. ex. for skydd av nysilver ett filtermaterial air koppar eller t. o. m. nysilver. Attacks of sulfur-containing air on nickel silver, copper, pulp and bronze and similar metals can according to the invention be avoided in the same way with silver filters, arranged in drums, barns or canisters, in the form of trades, ribbons or ropes. It is also conceivable to use filters with less strong reactivity than silver, e.g. for protection of nickel silver a filter material air copper or even nickel silver.

Som filtermaterial kan man med stor fOr- del utnyttja avfall Iran tillverkning av jul- gransglitter som besthr av plattvalsade kop- partradar med en mycket tuna forsilvring (00 it t ) Detta material kan anordnas i olika form t. ex. i kortklippta bitar (3-50 mm) eller i langre stumpar (50-500 mm) eller i helt oklippta langder. Kortklippta bitar kunna fyllas i godtycklig ordning i kassetter, vilket ger god homogenitet hos filtret. Langre stumpar ordnas lampligen parallella i gasens strOmningsriktning sasom visats i fig. 7, vilket ger lagt stromningsmotstand och stundom Or till fordel vid dimensionering av flaktsystem for luftrening, framst av flakt och motor i sadana system. Oklippt trad kan anvandas i form av trassel, t. ex. enligt fig. 2, 3, 5 eller 9. As a filter material, you can with great advantage use waste Iran production of Christmas tree glitter which consists of flat-rolled copper radar with a very thin silvering (00 it t) This material can be arranged in different shapes e.g. in short-cut pieces (3-50 mm) or in longer pieces (50-500 mm) or in completely uncut lengths. Short-cut pieces can be filled in any order in cassettes, which gives good homogeneity of the filter. Longer stubs are arranged suitably parallel in the direction of flow of the gas as shown in Fig. 7, which gives added flow resistance and sometimes Or in favor of dimensioning flat systems for air purification, foremost of flatness and engine in such systems. Uncut thread can be used in the form of tangles, e.g. according to Figs. 2, 3, 5 or 9.

Anvandning av julgransglitteravfall som filtermaterial Or sarskilt gyrmsamt ur ekonomisk synpunkt. Det fOrsilvrade utgangsmaterialet har nanaligen ett handelsvarde som Or lika med metallvardet (koppar + silver). Detta varde Or oberoende av materialets anvandRing som reningsfilter, varfor det sedan det fi5rbrukats som filtermaterial alltjamt har kvar sitt fulla metallvarde. Vid anvandning av detta materiel behavs salunda ingen regenerering utan man fyller i stallet pa nytt material da det gamla filtret forbrukats. Use of Christmas tree glitter waste as filter material Or particularly grim from an economic point of view. The silver-plated starting material has a trade value of n equal to the metal value (copper + silver). This value is independent of the use of the material as a purification filter, so that after it has been used as a filter material it still has its full metal value. When using this material, no regeneration is performed, but new material is added instead as the old filter has been consumed.

Claims

Patent claim:

1. Set for the removal of sulfur-containing hazardous impurities of the order of -8 and lower percent from air, Emir noted, that the air is passed through a filter, which contains some silver, e.g. in the form of pure silver or silver-plated copper so that sulfur cotton or other e.g. Organic sulfur compounds such as mercaptans are precipitated as a newly formed phase with a sulfur activity in the above order of magnitude or layers to protect objects consisting of silver in a pure, alloy, or plated state.

Salt according to patent claim 1, characterized in that the air is passed through a filter, which Or sh is made up of silver or silver compound, e.g. silTeroxide, that the sulfur precipitates ph a contact surface in the form of a solid phase consisting of air silver sulphide.

3. Set according to patent claims 1 and 2, characterized in that the air is passed through a filter, the material of which is made in the form of threads or ribbons, flattened into carpets, or as rags, thread clips or spans with grids. fitted, possibly transparent cassettes, drums or barns. Request publications: Patentskrtfter! Ran Danmark 76 994; United Kingdom 1143/1863, 305026; Germany 703670, 704096, 888471; USA 2 174 349. Other publications: Analytical abstracts 1 (1954), Abstr. No. 209

4. (Ref. Of Zurnal analitieeskoj chimii 9 (1954), pp. 58-59). Mullen, P W, Modern gas analysis. New York 1955, pp. 335-36.