公开(公告)号：US20190186075A1

公开(公告)日：2019-06-20

申请号：US16311213

申请日：2017-06-27

Applicant: KEMIRA OYJ

Inventor： Leif ROBERTSÉN ,  Veli-Matti VUORENPALO ,  Anna-Maija PERANDER ,  Pentti PEKONEN ,  Jonas KONN

IPC: D21C9/10 ,  D21C9/16

CPC classification number: D21C9/1036 ,  D21C9/163 ,  D21C9/166

Abstract: The present invention relates to a process for treating pulp comprising a step, wherein the pulp is treated with distilled percarboxylic acid, such as distilled per-carboxylic acid (dPAA), and peroxide, such as hydrogen peroxide.

公开(公告)号：US20200223786A1

公开(公告)日：2020-07-16

申请号：US16627016

申请日：2018-06-27

Applicant: Kemira Oyj

Inventor： Reijo AKSELA ,  Jonas KONN ,  Anna-Maija PERANDER ,  Anna HAARALA ,  Riitta ILMONIEMI ,  Hanna HOFFREN

IPC: C07C227/16 ,  D21C9/10 ,  B01J23/10

Abstract: The present invention relates to a process for the in situ preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine with maleic acid and then with 2-halocarboxylic acid, mixtures obtainable using said process and mixtures of chelating agents. In addition, the invention relates to methods where such mixtures are used.

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.

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.

公开(公告)号：US20200181063A1

公开(公告)日：2020-06-11

申请号：US16627055

申请日：2018-06-27

Applicant: Kemira Oyj

Inventor： Reijo AKSELA ,  Jonas KONN ,  Anna-Maija PERANDER ,  Anna HAARALA ,  Riitta ILMONIEMI ,  Hanna HOFFREN

IPC: C07C227/16 ,  D21C9/10 ,  C07C229/12

Abstract: The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents.