Patent GB-477461-A (GB)
Title: An improved adsorptive reagent for the removal of odorous and otherwise objectionable gases and vapours from atmospheres and the product of such process
IPC: C01B31/08
Filed: 1936-06-30
Abstract: An adsorptive reagent, particularly for the removal of vapours which are liable to taint foodstuffs or are odorous from atmospheres, comprises a mixture of activated carbon which has been charged with one or more halogens with activated carbon which has not been so charged.  If desired, depending on the gases which it is desired to remove, the uncharged active carbon may comprise a mixture of different types of carbon, and the charged carbon may comprise different carbons charged with the same or different halogens, or portions of the same carbon treated with different halogens.  It is stated that active carbons produced by impregnation of the raw carbonizable material with inorganic agents are more suitable for impregnation with halogen than active carbons not so produced.  A suitable reagent for removing odours of foodstuffs comprises 10--25 per cent of iodized or chlorinated carbon known as AC carbon with 90--75 per cent of untreated carbon known as T111 carbon.  The proportion of halogenized carbon may be increased to 50 per cent for removal of stronger odours.  When objectionable bodies, such as hydrochloric acid, are produced by the action of the adsorbed materials upon the halogenized carbons, a secondary substance which reacts with such products, e.g. sodium carbonate or hexamethylene tetramine may be added.  The latter reacts with acids to give formaldehyde, thus causing the adsorbent to act as a germicide. Instead of elementary halogen. the carbon may be impregnated with a readily decomposable compound such as sodium toluene para-chlorsulphonamine or toluene-para-sulphon-dichloramine.ALSO:An adsorptive reagent, particularly for the removal of vapours which are liable to taint foodstuffs or are odorous from atmospheres, comprises a mixture of activated carbon which has been charged with one or more halogens with activated carbon which has not been so charged.  If desired, depending on the gases it is desired to remove, the uncharged active carbon may comprise a mixture of different types of carbon, and the charged carbon may also comprise different carbons charged with the same or different halogens, or portions of the same carbon treated with different halogens.  It is stated that active carbons obtained by impregnation of the raw carbonizable material with inorganic agents are more suitable for impregnation with halogen than active carbon not so produced.  A suitable reagent for removing odours of food-stuffs comprises 10-25 per cent of iodized or chlorinated carbon known as A.C. carbon with 90-75 per cent of untreated carbon known as TIII carbon.  The proportion of halogenized carbon may be increased to 50 per cent for removal of stronger odours, e.g. in urinals.  When objectionable bodies, such as hydrochloric acid, are produced by the action of the adsorbed materials upon the halogenized carbons, a secondary substance which reacts with such products, e.g. sodium carbonate or hexamethylene tetramine may be added.  The latter reacts with acids to give formaldehyde, thus causing the adsorbent to act as a germicide. Instead of elementary halogen, the carbon may be impregnated with a readily decomposable compound such as sodium toluene parachlorsulphonamine or toluene-para-sulphone dichloramine.