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Process for making lyocell fiber from sawdust pulp

InactiveUS6861023B2Reducing average degree of polymerizationReduced hemicellulose contentPulp properties modificationArtificial filaments from cellulose solutionsCopperLyocell
A process for making lyocell fibers including the steps of pulping raw material in a digester to provide an alkaline pulp, wherein the raw material includes sawdust in an amount greater than 0% up to 100%; contacting the alkaline pulp including cellulose and at least about 7% hemicellulose under alkaline conditions with an amount of an oxidant sufficient to reduce the average degree of polymerization of the cellulose to the range of from about 200 to about 1100 without substantially reducing the hemicellulose content or substantially increasing the copper number of the pulp; and forming fibers from the pulp.
Owner:INT PAPER CO

Method for preparing bio-carrier by porous foam polymer modification

InactiveCN102786710AAdapt to fixityAdaptive performanceChemical industryDispersed particle separationCross-linkPolymer modified
The invention discloses a method for preparing a bio-carrier by porous foam polymer modification. The method is used for coating bonding modification of porous foam polymers. The method comprises the following steps of adding one or more cationized porous high-adsorptivity functional materials and one or more cationized polyhydric hydrophilic functional materials into coating modification slurry, mixing the coating modification slurry and a cationic acrylic acid emulsion, carrying out coating bonding of the mixture on one or more porous foam polymers, and carrying out cross-linking curing to obtain the modified bio-carrier having strong adsorbability, hydrophily, surface active functional group diversity, positive surface charges and strong biocompatibility. The method provided by the invention is not limited by structures, shapes, aperture sizes and physical properties of foam polymers and can be widely used for external coating modification of multiple carrier materials. The method provided by the invention has the advantages of convenient and simple operation, low investment and making cost, excellent carrier performances and long service life. The bio-carrier obtained by the method can be widely used in fields of fixed attachment of various microorganisms, and enhanced biological treatment.
Owner:纪群
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