Activation of water soluble amines by halogens for trapping methyl radioactive iodine from air streams

• US 4,040,802 A
• Filed: 04/22/1975
• Issued: 08/09/1977
• Est. Priority Date: 04/22/1975
• Status: Expired due to Term

• Current Assignee: Charles H. Blachly, Victor R. Deitz
• Original Assignee: Charles H. Blachly, Victor R. Deitz
• Inventors: Deitz, Victor R., Blachly, Charles H.
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US05/570,925
• Time in Patent Office: 840 Days
• Field of Search: 55/74, 55/71, 55/387, 252/415, 252/438, 252/444
• US Class Current: 95/142
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3248 the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
• CPC Class Codes: B01J 20/3251 comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur
• CPC Class Codes: B01J 20/3255 comprising a cyclic structure containing at least one of the heteroatoms nitrogen, oxygen or sulfur, e.g. heterocyclic or heteroaromatic structures
• CPC Class Codes: G21F 9/02 Treating gases

Abstract

Gas adsorbent charcoals impregnated with an aqueous solution of the reaction product of a tertiary amine and elemental iodine or bromine are better than 99 per cent efficient in trapping methyl iodine¹³¹. The chemical addition of iodine or bromine to the tertiary amine molecule increases the efficiency of the impregnated charcoal as a trapping agent, and in conjunction with the high flash point of the tertiary amine raises the ignition temperature of the impregnated charcoal.

Claims

1. In the method of removing methyl iodine¹³¹ gas from the effluent of a reactor by passing the effluent gas through an organic impregnated charcoal, the improvement comprising employing an impregnated charcoal prepared by contacting charcoal with an aqueous mixture of a halogen selected from the group consisting of iodine and bromine, and a tertiary amine selected from the group consisting of hexamethylenetetramine, triethyanolamine, triethylenediamine, N-methylmorpholine, N, N, N'"'"', N'"'"'-tetramethylethylenediamine, 1, dimethylamino-2-propanol, N-methylpiperazine, and N, N, N'"'"', N'"'"'-tetramethyl-1,4-butanediamine, wherein the concentration of halogen in the charcoal is between 0.4 and 1.6%, and the concentration of tertiary amine in the charcoal is between 2 and 7%, based on the weight of the charcoal.