公开(公告)号：US20240018726A1

公开(公告)日：2024-01-18

申请号：US18038908

申请日：2021-11-29

Applicant: KEMIRA OYJ

Inventor： Marko KOLARI ,  Juhana AHOLA

IPC: D21H21/36 ,  D21H11/14 ,  D21H17/65 ,  D21C9/00

CPC classification number: D21H21/36 ,  D21H11/14 ,  D21H17/65 ,  D21C9/004

Abstract: The invention relates to a method for reducing bacterial endospores in an aqueous fibre suspension comprising recycled cellulosic fibres, wherein the fibre suspension has an original endospore amount, preferably of ≥10 000 CFU/ml. The method comprises adjusting the pH of the fibre suspension to a pH value of ≤6.5, adjusting the oxidation-reduction potential (ORP) of the fibre suspension to an ORP value of ≥200 mV with a first oxidizing agent, and introducing an amount of performic acid as a second oxidizing agent to the fibre suspension for reducing the bacterial endospores to an endospore amount of ≤1000 CFU/ml.

公开(公告)号：US11643776B2

公开(公告)日：2023-05-09

申请号：US16977159

申请日：2019-02-18

Applicant: Stora Enso OYJ

Inventor： Philip Håkansson ,  Kaj Backfolk ,  Isto Heiskanen

IPC: D21C9/00 ,  C08B15/08 ,  D21H11/18 ,  C04B16/02

CPC classification number: D21C9/004 ,  C04B16/02 ,  C08B15/08 ,  D21H11/18

Abstract: The invention discloses a method to form a composition, which method includes fibrillating fibers to form MFC in the presence of an alkali-metal silicate whereby an MFC and silicate mixture is formed The presence of alkali-metal silicate during fibrillation of fibers to MFC, reduces the viscosity and increases the water release behavior, whereby the fibrillation can be accomplished at higher concentrations and a more uniform mixture of MFC-silicate is accomplished. The composition formed by the method of the invention may e.g. be used in paper or paperboard production, in cement production or as an additive in composites.

公开(公告)号：US20180273645A1

公开(公告)日：2018-09-27

申请号：US15918670

申请日：2018-03-12

Applicant: SHIN-ETSU CHEMICAL CO., LTD.

Inventor： Akira KITAMURA ,  Mitsuhiro YOSHIDA

IPC: C08B11/02 ,  D21C9/00

CPC classification number: C08B11/02 ,  C08B11/08 ,  C08B11/193 ,  D21C9/004

Abstract: Provided is a method for producing hydroxypropyl methyl cellulose (HPMC) having high hydroxypropoxy content, low ash content, and low insoluble fiber content. More specifically, provided is a method for producing HPMC having a methoxy degree of substitution of from 1.4 to 2.2 and a hydroxypropoxy molar substitution of from 0.5 to 1.0, including steps of: bringing sheet-like or chip-like pulp into contact with an alkali metal hydroxide solution to obtain a reaction product mixture containing alkali cellulose, removing a liquid portion from the reaction product mixture to obtain the alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a crude HPMC, disintegrating the crude HPMC into a disintegrated crude HPMC, dispersing the disintegrated crude HPMC in water to obtain a slurry, filtering the slurry to obtain a cake, and washing the cake.

公开(公告)号：US10006168B2

公开(公告)日：2018-06-26

申请号：US14896031

申请日：2014-06-13

Applicant: L'Air Liquide Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude ,  Association de Gestion De L'Ecole Francaise de Papeterie et des Industries Graphiques (AGEFPI) ,  Degremont France ,  Xylem Water Solutions Herford GmbH ,  Arkema France

Inventor： Frederic Pouyet ,  Dominique Lachenal ,  Christine Chirat

IPC: D21C9/153 ,  D21C9/02 ,  D21C9/08 ,  D21C9/10 ,  D21C9/00

CPC classification number: D21C9/1073 ,  D21C9/002 ,  D21C9/004 ,  D21C9/005 ,  D21C9/08 ,  D21C9/083 ,  D21C9/086 ,  D21C9/153

Abstract: This invention relates to a method for treating chemical paper pulp comprising a step of treating the pulp with ozone followed by a step of alkaline extraction, in which alkaline extraction takes place in the presence of magnesium ions (Mg2+).

公开(公告)号：US09828725B1

公开(公告)日：2017-11-28

申请号：US15353390

申请日：2016-11-16

Applicant: Rayonier Performance Fibers, LLC.

Inventor： Othman A. Hamed ,  Romuald Krzywanski

IPC: D21C9/00

CPC classification number: D21C9/004 ,  D21C9/005

Abstract: A method for making a specialty fiber by activating pulp in an alkaline aqueous medium, then reacting it a water-soluble, multi-functional reagent able to bridge neighboring cellulose chain within a single fiber. The resultant specialty cellulose fibers have high intrinsic viscosity and may be used to make cellulose ethers, cellulose acetate, and viscose.

公开(公告)号：US20170175329A1

公开(公告)日：2017-06-22

申请号：US15293953

申请日：2016-10-14

Applicant: Nicole Rumore ,  Steven Finley

Inventor： Nicole Rumore ,  Steven Finley

IPC: D21C9/153 ,  D21C9/00

CPC classification number: D21C9/153 ,  D21C9/004 ,  D21C9/02 ,  D21C9/147

Abstract: A method for treating pulp through oxygen delignification and ozone bleaching is disclosed. The method uses a modified oxygen recovery unit which separates a mixture of oxygen and ozone thereby generating a stream of ozone and a stream of oxygen; feeding the stream of oxygen to an oxygen delignification unit; feeding a pulp to the oxygen delignification unit; feeding the stream of ozone to an ozone bleaching unit; feeding the delignified pulp to the ozone bleaching unit; and recovering the delignified and bleached pulp.

公开(公告)号：US09422663B1

公开(公告)日：2016-08-23

申请号：US14934115

申请日：2015-11-05

Applicant: Aicardo Roa-Espinosa

Inventor： Aicardo Roa-Espinosa

IPC: D21C9/00 ,  D21C1/00

CPC classification number: D21C9/001 ,  D21C1/00 ,  D21C1/04 ,  D21C1/06 ,  D21C9/004 ,  D21C9/005 ,  D21C9/007

Abstract: A process for treatment of biomass materials is disclosed. The treatment comprises of applying mechanical rubbing and crushing action to the biomass materials that result in significant reduction in the biomass particle size. The treatment is carried out in a chamber where the biomass is subjected to the action of a plurality of rotating pins against channels disposed on the chamber interior wall. The maceration of the biomass is further aided by impact from a plurality of blocks and sand particles placed inside the treatment chamber that are hurled into motion inside the chamber through collision with the rotating pins. Chemical catalysts may be used to speed up the maceration. These include aluminum silicate, either an acid or alkaline pretreatment, gaseous urea or urea granules. The treatment produces materials that are beneficial in a variety of applications such as soil erosion prevention, biofuel manufacturing, plant growth substrates and animal bedding.

Abstract translation: 公开了一种处理生物质材料的方法。 该处理包括对生物质材料施加机械摩擦和破碎作用，导致生物质粒度的显着降低。 处理在室中进行，其中生物质经受设置在室内壁上的通道的多个旋转销的作用。 通过与放置在处理室内的多个块体和砂粒颗粒的碰撞进一步辅助生物质的浸渍，所述块体和砂粒子通过与旋转销的碰撞而在室内投入运动。 化学催化剂可用于加速浸渍。 这些包括硅酸铝，酸或碱性预处理，气态尿素或尿素颗粒。 该处理产生在各种应用中有益的材料，例如防止水土流失，生物燃料制造，植物生长基质和动物床上用品。

公开(公告)号：US20160201261A1

公开(公告)日：2016-07-14

申请号：US14913513

申请日：2014-09-02

Applicant: UPM-KYMMENE CORPORATION

Inventor： Markus Nuopponen ,  Timo Paakkonen ,  Raili Ponni ,  Tapani Vuorinen

IPC: D21C9/00 ,  D21C9/02 ,  C08B15/02

CPC classification number: C08B15/04 ,  C08B1/08 ,  C08B15/02 ,  D21C9/004 ,  D21C9/005 ,  D21C9/02 ,  D21H11/18

Abstract: A method for catalytic oxidation of cellulose using a heterocyclic nitroxyl radical as catalyst and main oxidant acting as oxygen source comprises, before the catalytic oxidation of the cellulose, pretreatment of the cellulose—in an alkaline pretreatment step, where the cellulose is treated in alkaline solution having hydroxide concentration of above 0.3 M, and—in a washing step, where the cellulose treated in the alkaline solution is washed to lower the pH.

Abstract translation: 使用杂环硝酰自由基作为催化剂和作为氧源的主要氧化剂的纤维素催化氧化的方法包括在纤维素的催化氧化之前，在碱性预处理步骤中预处理纤维素，其中纤维素在碱性溶液中处理 具有高于0.3M的氢氧化物浓度，并且在洗涤步骤中，洗涤在碱性溶液中处理的纤维素以降低pH。

公开(公告)号：US20150233056A1

公开(公告)日：2015-08-20

申请号：US14422619

申请日：2012-08-21

Applicant: James M. Lockhart

Inventor： James M. Lockhart

IPC: D21H11/04 ,  D21C3/04 ,  D21C3/02 ,  C08B15/02 ,  D21C11/00

CPC classification number: D21H11/04 ,  C08B15/02 ,  C08H8/00 ,  D21C3/02 ,  D21C3/04 ,  D21C9/004 ,  D21C11/0007

Abstract: A method of recovering purified partly-hydrolyzed cellulose (36) from a composition (14) comprising partly-hydrolyzed cellulose and an acid, such as sulfuric acid. A base (28) having a cation that forms a precipitate with the anion of the acid is added to the composition. For example, a base such as barium hydroxide is added to form a sulfate precipitate. The precipitate (38) is then separated from the partly-hydrolyzed cellulose (36), thus reducing its acid content. The method may include additional steps of centrifugation (18) of the composition, breaking-up agglomerations (44) in the composition after precipitation, and dialysis (42).

Abstract translation: 从包含部分水解的纤维素和酸如硫酸的组合物（14）中回收纯化的部分水解的纤维素（36）的方法。 向组合物中加入具有与酸阴离子形成沉淀物的阳离子的碱（28）。 例如，加入碱如氢氧化钡以形成硫酸盐沉淀。 然后将沉淀物（38）与部分水解的纤维素（36）分离，从而降低其酸含量。 该方法可以包括组合物离心（18），沉淀后组合物中的分解团聚体（44）和透析（42）的附加步骤。

公开(公告)号：US20150203737A1

公开(公告)日：2015-07-23

申请号：US14417513

申请日：2013-07-26

Applicant: CelluComp Ltd. ,  Cosun Biobased Products B.V.

Inventor： Gerardus Petrus Franciscus Maria Van Engelen ,  Gijsbert Adriaan Van Ingen ,  Corne Meeuwissen

IPC: C09K8/10 ,  C12P19/02 ,  C12P19/14

CPC classification number: C09K8/10 ,  C09K8/206 ,  C12P19/02 ,  C12P19/14 ,  D21C3/02 ,  D21C5/00 ,  D21C5/005 ,  D21C9/002 ,  D21C9/004 ,  D21C9/007 ,  D21H11/18

Abstract: This invention relates to water-based well drilling fluids. It has been found that cellulose based particles, which comprise cell wall material and their networks of cellulose based fibers and nanofibrils can be used to produce suspensions having viscosity and rheological properties particularly suitable for use as a drilling fluid. It is assumed that the organization of the cellulose fibrils, as it exists in the parenchymal cell walls, is at least partly retained in the cellulose based particles of the invention, even though part of the pectin and hemicellulose is removed there from. Breaking plant-based pulp down into this kind of cellulose based particles involves fewer and gentler processes than to break the pulp down further into cellulose nanofibrils, and therefore the present cellulose based particles can be produced much faster and at lower cost than completely unraveled cellulose nanofibrils. The well drilling fluids based on the cellulose material of this invention are stable over a wide range of operating temperatures.

Abstract translation: 本发明涉及水基钻井液。 已经发现，包含细胞壁材料的纤维素基颗粒及其纤维素基纤维和纳米原纤维的网络可用于制备具有特别适合用作钻井液的粘度和流变特性的悬浮液。 假设纤维素原纤维的组织，如其存在于实质细胞壁中，至少部分地保留在本发明的纤维素基颗粒中，即使部分果胶和半纤维素从那里去除。 将基于植物的纸浆打碎成这种基于纤维素的颗粒涉及比将纸浆进一步分解成纤维素纳米原纤维更少和温和的方法，因此与纤维素纳米原纤维相比，本发明的纤维素基颗粒可以以更快的速度和更低的成本生产 。 基于本发明的纤维素材料的钻井液在宽范围的工作温度下是稳定的。