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：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：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：US20150322170A1

公开(公告)日：2015-11-12

申请号：US14653417

申请日：2013-12-19

Applicant: KEMIRA OYJ

Inventor： Martin HÄGGBLOM ,  Veli-Matti VUORENPALO

IPC: C08B15/02

CPC classification number: C08B15/02 ,  C08L1/02

Abstract: The present invention relates to a method for producing dewatered microfibrillated cellulose (MFC) comprising i) providing an aqueous MFC slurry, ii) optionally dewatering said MFC slurry by mechanical means to provide a partly dewatered MFC slurry, and iii) subjecting the MFC slurry or the partly dewatered MFC slurry to one or more drying operations by means of one or more absorbing materials to produce dewatered MFC. The produced MFC can be redispersed in water without deteriorating the material properties of the MFC.

Abstract translation: 本发明涉及一种生产脱水微纤化纤维素（MFC）的方法，包括：i）提供MFC水性浆料，ii）通过机械方法任选地使所述MFC浆料脱水以提供部分脱水的MFC浆料，和iii）使MFC浆料或 部分脱水的MFC浆料通过一种或多种吸收材料进行一次或多次干燥操作以产生脱水的MFC。 生产的MFC可以再分散在水中，而不会降低MFC的材料性能。