| abstract |
1,271,766. Separating gas mixtures by adsorption. OCTROOIEN MAATSCHAPPIJ "ACTIVIT" N.V. 4 June, 1970 [4 June, 1969], No. 26998/70. Heading B1L. A sorbent of use in the separation of gas and/or vapour mixtures comprises beads of a macroporous insoluble polymer based on monomeric vinyl- or divinyl-aromatic compounds, unsaturated esters, substituted vinyl compounds and derivatives of unsaturated acids or nitriles, the polymer containing polar or polarisable non-disociable halogen, nitro, hydroxyl, ester, aldehyde, ketone, amide, nitrile, acetyl or methylol groups. Preferred polymers are a copolymer of styrene with 2-80% by weight of divinylbenzene which contains nitro, chloro or acetyl groups, and a copolymer of methyl methacrylate with glycol dimethacrylate. Separations of toluene, methanol, sulphur dioxide, n-butanol, and acetone in each case from air are described. |