Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1975-05-21
1977-10-25
Garvin, Patrick P.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252448, 210 31C, 106164, 106168, B01J 3700, B01D 300
Patent
active
040555100
ABSTRACT:
The invention relates to a method for manufacturing of spherical cellulose particles in bead form which enables to control the partial shape and porosity of the particles. Resulting cellulose sorbents are suitable carriers and materials for chromatography. The invented methods consists in heating a viscose (an aqueous solution of sodium cellulose xanthate) suspension in a water-immiscible liquid to 30.degree.-100.degree. C under stirring to form spherical droplets and solidify them and in the subsequent acidic decomposition of the solid xanthate globules either directly by addition of an acid soluble in the dispersion medium, or additionally after isolation and eventual washing of the particles to achieve the required wet volume. Liquids with the viscosity up to 100 cSt are advantageously used as dispersion medium and surfactants and/or modifying reagents (e.g. epichlorohydrine) may be added to the suspension.
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patent: 3597350 (1971-08-01), Determann et al.
patent: 3671463 (1972-06-01), Colgan
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patent: 3864327 (1975-02-01), Marchant
Chitumbo, K., et al. J. Polymer Sci: PT.C. No. 36, pp. 279-292 (1971).
Blace Zdenko
Peska Jan
Stamberg Jiri
Ceskoslovenska akademie ved
Garvin Patrick P.
Niebling John F.
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