Title: Method for producing regular porous cellulose pearls, corresponding cellulose pearls and use thereof
Application Number: 98802567 Application Date: 1998.12.09
Publication Number: 1248274 Publication Date: 2000.03.22
Approval Pub. Date: 2004.03.17 Granted Pub. Date: 2004.03.17
International Classifi-cation: B01J2/06;C08J3/16;G01N30/48
Applicant(s) Name: Thuringisches Institut Fur Textil-Und Kunststoff-F Address:
Inventor(s) Name: C. Beyer;F. Meister;C. Michels
Attorney & Agent: lin wenhe
Abstract:
    The invention relates to a method for producing regular porous pearls of cellulose with a particle size of 2 to 1000 mu m, comprising the following steps: a) a cellulose with a degree of polymerisation of 150 to 2000 is dissolved in a solvent to form a 0.5 to 25 mass % solution, b) the cellulose solution is reduced to fine particles and dispersed in a dispersion agent which does not mix with the cellulose solution and which has a degree of viscosity of 10 to 8000 mPa.s, c) the disperse particles of the solution are solidified into regular pearl particles 1) after the dispersion has been cooled to below the melting temperature of the cellulose solution and the hardened particles of cellulose solution have been separated from the dispersion agent or 2) directly in the solution by precipitation with a liquid precipitating agent which mixes with the solvent, and d) the pearl particles are separated from the liquid mixture of the solvent, the precipitating agent and optionally, the dispersing agent.
Time: 10
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