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    METHOD FOR PRODUCING CATIONIZED CELLULOSE AND CATIONIZED CELLULOSE
    3.
    发明申请
    METHOD FOR PRODUCING CATIONIZED CELLULOSE AND CATIONIZED CELLULOSE 有权

    公开(公告)号：US20230014619A1

    公开(公告)日：2023-01-19

    申请号：US17781963

    申请日：2020-12-04

    Applicant: Kemira Oyj

    Inventor： Veli-Matti VUORENPALO ,  Jonni AHLGREN ,  Jaakko HILTUNEN ,  Anna-Maija PERANDER ,  Chunlin XU ,  Sanna LEHTO ,  Eija AHONEN ,  Tarja IKÄVALKO

    IPC: C08B11/14 ,  C08B1/08

    Abstract: The invention relates to a method for producing cationized cellulose. The method comprises at least preparing a slurry of a cellulosic starting material in an alkaline liquid medium which comprises an organic liquid and performing mercerization of the slurry. The concentration of the cellulosic starting material in the slurry is at least 20 weight-%, calculated as dry from total weight of the liquid medium and the cellulosic starting material. A cationizing agent is added to the slurry after the mercerization step at a cationization temperature, which is less than the boiling point of the alkaline liquid medium, and the cellulose in the slurry is allowed to react with the cationizing agent, preferably under inert atmosphere and a cationized cellulose product is obtained.

    A TREATMENT SYSTEM, ITS USE AND METHOD FOR TREATING EFFLUENT AND/OR SLUDGE
    5.
    发明公开
    A TREATMENT SYSTEM, ITS USE AND METHOD FOR TREATING EFFLUENT AND/OR SLUDGE 审中-公开

    公开(公告)号：US20240300839A1

    公开(公告)日：2024-09-12

    申请号：US18571998

    申请日：2022-06-20

    Applicant: KEMIRA OYJ

    Inventor： Veli-Matti VUORENPALO ,  Jonni AHLGREN ,  Jaakko HILTUNEN ,  Anna-Maija PERANDER

    IPC: C02F11/147 ,  C02F103/28

    CPC classification number: C02F11/147 ,  C02F2103/28

    Abstract: The invention relates to a treatment system and method for treating effluent and/or sludge from a manufacturing process of cellulosic pulp or a fibrous cellulosic web, such as paper or board. The effluent and/or sludge is in form of a suspension comprising solid material and/or particles suspended in an aqueous liquid phase. The treatment system comprises a water-soluble cationized polysaccharide component comprising cationized cellulose having a charge density of at least 1.5 meq/g dry, measured at pH 4, and a synthetic cationic copolymer of (meth)acrylamide and at least one cationic monomer, the copolymer having a charge density of at most 5 meq/g.

    METHOD FOR PRODUCING A MODIFIED CATIONIZED POLYSACCHARIDE, MODIFIED CATIONIZED POLYSACCHARIDE AND ITS USE
    6.
    发明公开
    METHOD FOR PRODUCING A MODIFIED CATIONIZED POLYSACCHARIDE, MODIFIED CATIONIZED POLYSACCHARIDE AND ITS USE 审中-公开

    公开(公告)号：US20240141075A1

    公开(公告)日：2024-05-02

    申请号：US18281067

    申请日：2022-03-18

    Applicant: KEMIRA OYJ

    Inventor： Jaakko HILTUNEN ,  Jonni AHLGREN ,  Sanna LEHTO ,  Eija AHONEN

    IPC: C08B15/06

    CPC classification number: C08B15/06

    Abstract: The invention relates to a method for producing a modified cationized polysaccharide. The method comprises preparing a reaction slurry by mixing of a starting material comprising a polysaccharide, preferably cellulose, and an alkaline liquid medium comprising an organic liquid, allowing the polysaccharide to interact with the alkaline liquid medium in the reaction slurry at a pre-treatment temperature under a pre-determined reaction time, and adjusting the temperature of the reaction slurry to modification temperature, which is less than the boiling point of the alkaline liquid medium. A cationizing agent and an alkylation agent, which comprises an epoxy group, are added to the reaction slurry at the modification temperature, and the polysaccharide is allowed to react with the alkylation agent and the cationizing agent, preferably under inert atmosphere, and obtaining a modified cationized polysaccharide product in solution form. The invention relates also to the modified cationized polysaccharide and its use as flocculation agent.

    AN AQUEOUS EMULSION AND METHOD FOR MAKING IT
    7.
    发明公开
    AN AQUEOUS EMULSION AND METHOD FOR MAKING IT 审中-公开

    公开(公告)号：US20230243101A1

    公开(公告)日：2023-08-03

    申请号：US18008662

    申请日：2021-06-23

    Applicant: KEMIRA OYJ

    Inventor： Jaakko HILTUNEN ,  Elisabeth LACKINGER-CSARMANN ,  Reetta STRENGELL

    IPC: D21H17/23 ,  D21H21/16

    CPC classification number: D21H17/23 ,  D21H21/16

    Abstract: The invention relates to an aqueous emulsion of a hydrophobic anhydride-based sizing agent, prepared by homogenizing the said anhydride-based sizing agent in an aqueous phase which comprises a stabilizer, which is an anionic lignin-carbohydrate complex, where lignin and carbohydrate are covalently bound with each other. The invention further relates to a use of this anionic lignin-carbohydrate complex as a stabilizer as well as to a method for making an aqueous emulsion of a hydrophobic anhydride-based sizing agent.

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