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US 4,055,510 AGranted
Method for manufacturing of spherical cellulose particles
AssigneeCeskoslovenska akademie ved
InventorsJan Peska, Jiri Stamberg, Zdenko Blace
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AssigneeCeskoslovenska akademie ved
InventorsJan Peska, Jiri Stamberg, Zdenko Blace
Estimating the term…
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.
A method of producing spherical cellulose particles, which consists of the sequence of steps of providing a dispersion of viscose droplets in a water-immiscible liquid, heating such dispersion at a temperature of at least 30.degree. to 100.degree. C. with continuous agitation under stationary hydrodynamic conditions for a time sufficient to partially regenerate the cellulose in the viscose and to thereby, and solely as a result of said heating, solidify the viscose droplets into shape-stable particles, and thereafter completing the regeneration of the cellulose in
Dependencies are inferred from the claim text.