Method for manufacturing of spherical cellulose particles
US4055510A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1975 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | May 21, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.