| 摘要 |
1,241,858. Separating NO 2 from gas mixtures; gas filters. IMPERIAL CHEMICAL INDUSTRIES Ltd. 17 Dec., 1969 [30 Dec., 1968], No. 61660/68. Headings B1L and BIT. Nitrogen dioxide is removed from gas streams, e.g. of air or nitrous oxide, by sorption on a polyamide. The polyamide may be polyhexamethylene suberamide or sebacamide, or polycaprolactam, but is preferably polyhexamethylene adipamide; copolymers may also be employed. The polyamide may be used in the form of powder or a sintered porous structure, but most suitably in fibrous form, especially by using two-component polyamide fibres, one component of which possesses potentially adhesive properties so that a bundle of such fibres may be compacted to form a coherent and stable filter body. |
