Porous spherical glass filtrating beads and method for the manuf

Details Porous spherical glass filtrating beads and method for the manuf Porous spherical glass filtrating beads and method for the manuf

1986-08-06

1987-12-15

Lander, Ferris H.

Chemistry: molecular biology and microbiology

Carrier-bound or immobilized enzyme or microbial cell;...

Enzyme or microbial cell is immobilized on or in an...

435814, 435815, 210679, 501 33, 501 34, C12N 1114, C03C 1100

Patent

active

047133384

ABSTRACT:
Porous glass beads for filtation applications having a homogeneous metaloxane structure and comprising oxides of Si, Zr and optionally Ti and Al. A preferred method for making these beads comprises the steps of (a) providing a mother solution of Si and Zr alkoxides in a water soluble solvent, for instance a lower aliphatic alcohol, (b) providing a liquid dispersant phase in which solution (a) is dispersible and stirring this liquid phase sufficiently to cause (a) to be formed into droplets of substantially uniform size when added to (b), (c) adding (a) to (b) at a rate sufficient to provide said droplets and effecting the hydrolysis of the alkoxides contained therein with consecutive gelation of said droplets into corresponding hardened beads of condensed mixed Si and Zr hydroxides, and (d) separating said beads from the liquid phase and drying to achieve the desired porous mixed oxide structure for the beads.

REFERENCES:
patent: 4168261 (1979-09-01), Edy
patent: 4279654 (1981-07-01), Yajimu et al.

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