B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
18/505
B01J 13/02 (2006.01) B01J 13/04 (2006.01) B22F 1/00 (2006.01) B29C 49/00 (2006.01) C03B 19/10 (2006.01) C03C 11/00 (2006.01) C04B 18/02 (2006.01) C04B 38/00 (2006.01) C04B 38/08 (2006.01) C04B 41/45 (2006.01) E21B 43/267 (2006.01)
Patent
CA 1264905
ABSTRACT OF THE INVENTION 1 Hollow microspheres made from dispersed particle film forming compositions comprising dispersed particles, a binder, a film stabilizing agent, a dispersing agent and a continuous liquid phase are described. Porous and non-porous hollow microspheres can be made. The hollow microspheres can be caused to have walls with voids which are interconnected to each other and to the inner and outer wall surfaces, and can be used as membrane substrates in selective separation processes and in biotech processes. The hollow microspheres can be used as supports for catalysts and as enclosures for catalysts, adsorbents and absorbents. The hollow microspheres can also be used as filler materials and as proppants for increasing gas recovery from gas wells. The hollow microspheres are made by a process which comprises forming a film of a dispersed particle film forming composition across a coaxial blowing nozzle, applying a blowing gas at a positive pressure on the inner surface of the dispersed particle composition film to blow the film and form an elongated cylinder shaped film of the dispersed particle composition. The cylinder shaped film is initially closed at its outer end, and as the cylinder shaped film progresses away from the coaxial nozzle, the film closes at its inner end, prior to the beginning of the formation of the next cylinder shaped film at the coaxial nozzle. The hollow dispersed particle composition microspheres are individually formed as they emerge from the coaxial nozzle. The blown microspheres form substantially spherical hardened hollow green microspheres. The hollow microspheres can be blown into warm or hot ambient air to rapidly remove a portion of the continuous phase and harden the microspheres. Where a thermoplastic binder is used, the microspheres can be blown into cool or cold ambient air to rapidly cool and harden the microspheres. Where a photopolymerizable binder is used, the hollow microspheres can be subjected to ultraviolet light to rapidly polymerize the binder and harden the hollow microspheres. The hollow microsphere can be made from dispersed ceramic particles, glass particles, metal particles, metal glass particles and plastic particles, and mixtures thereof. The dispersed particles can be 0.005 to 60 microns in size. The hardened hollow green microspheres obtained from the microsphere blowing step can be heated at elevated temperatures to remove the continuous liquid phase and to sinter the dispersed particles to form strong hollow porous microspheres. The hollow porous microspheres can be treated with semipermeable membrane forming materials to make them non-porous and suitable for use in selective separation processes and in biotech processes, or the microspheres can be impregnated with liquids or gels and used in controlled release and membrane processes.
488123
Borden Ladner Gervais Llp
Torobin Leonard B.
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