Patent ID: 6780818
Filing Date: 2004-08-24
Classification: B01J,G01N,Y10T

Abstract:
A method for preparation of a sorbent for sampling of semi-volatile organic gases and particulate components, said sorbent comprising macroreticular resin agglomerates of randomly packed microspheres with a continuous porous structure of particles ranging in size from 0.5 to 10 microns, said method comprising steps:a) preparing particles of a macroreticular resin or a combination of the macroreticular resin with an activated carbon, said particles ranging in size between 0.5 and 10 microns, by: i. grinding the macroreticular resin or a combination thereof with the activated carbon to the particles having a size of 10 microns or lower; ii. suspending said ground macroreticular polymeric resin or the combination thereof in an organic solvent, wherein said resin is selected from the group consisting of a styrene divinylbenzene polymer or copolymer, a polyaromatic polymer or copolymer, polystyrene polymer or copolymer, ethyl vinylbenzene, ethyl vinylbenzene-divinyl benzene, methylmethacrylate, methacrylate-divinylbenzene, methacrylate-styrene, 2,6-diphenyl-p-phenylene oxide, bonded or non-bonded silica, alumina and fluoracil, said resin having a pore size between 45 to 2000 Ã¥ and a surface area between 35 and 2000 m2/g; iii. purifying said suspension of step (ii) by a solvent extraction or sonication; iv. filtering the suspension through a 0.5 micron filter to remove all particles of sizes below 0.5 micron; and v. recovering a fraction remaining on the filter; b) vacuum or air drying the fraction remaining on the filter; and c) recovering the dry fraction as the sorbent for sampling of the semi-volatile organic gases and particulate components.