Patents Assigned to Kemira
  • A METHOD AND SYSTEM FOR DETERMINATION OF STARCH IN A SAMPLE
    Publication number: 20200278293
    Abstract: In a starch concentration measurement, a liquid sample is conducted from a liquid sample such as pulp suspension or filtrate of a paper, board or tissue process. An iodine solution is added to the sample, and a light absorbance or transmittance of the sample is measured at a wavelength longer than about 650 nm, for example longer than about 700 nm. The measured absorbance or transmittance of the sample is converted into the starch concentration of the sample by a predefined correlation between a starch concentration and a light absorbance or transmittance.
    Type: Application
    Filed: March 24, 2017
    Publication date: September 3, 2020
    Applicant: KEMIRA OYJ
    Inventors: Lari VÄHÄSALO, Marjatta PIIRONEN, Iiris JOENSUU
  • Functionalized magnetic nanoparticles and a method for preparation thereof
    Patent number: 10726981
    Abstract: The present disclosure relates to a method for manufacturing a covalently functionalized coated magnetic nanoparticle and to said particles and uses thereof. The preparation method includes forming a shell of a hydrophilic polymer coating layer on top of a magnetic metal core coated with a carbon coating. In the method a particle comprising a magnetic metal core coated with a carbon coating is provided. The surface of the particle is subjected to covalent functionalization by generating amino reactive groups via diazonium chemistry and subsequently an irreversible attachment of an atom transfer radical polymerization (ATRP) initiator is carried out on said surface. A hydrophilic polymer layer is formed) by a surface initiated atom transfer radical polymerization (SI-ATRP) reaction with a monomer comprising N-isopropylacrylamide (NIPAM).
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: July 28, 2020
    Assignee: Kemira Oyj
    Inventors: Mehrdad Hesampour, Lasse Kyllönen, Ari Auvinen, Adina Anghelescu-Hakala
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200223786
    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.
    Type: Application
    Filed: June 27, 2018
    Publication date: July 16, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • A METHOD AND SYSTEM FOR OPTIMIZATION OF COAGULATION AND/OR FLOCCULATION IN A WATER TREATMENT PROCESS
    Publication number: 20200223719
    Abstract: Methods and systems are disclosed for optimization of coagulation and/or flocculation in a water treatment process. According to exemplary embodiments, samples are taken from an aqueous liquid and the samples are monitored with an imaging device to capture visual data of particles dispersed or suspended in the liquid. The particles are classified into particle types based on the visual data and a particle size distribution indication is computed for each classified particle type. The particle size distribution indication is then compared to a predetermined particle size distribution value, and in response to a difference detected, dosage of at least one coagulation and/or flocculation agent in the water treatment process can be adjusted.
    Type: Application
    Filed: March 31, 2017
    Publication date: July 16, 2020
    Applicant: KEMIRA OYJ
    Inventors: Marjatta Piironen, Iiris Joensuu, Mehrdad Hesampour
  • Improving sludge dewaterability and energy balance of wastewater treatment
    Patent number: 10703662
    Abstract: The present invention relates to a process for treating primary sludge in a wastewater treatment plant, comprising the steps of admixing an organic coagulant and/or polymer to wastewater; allowing a primary treatment of the wastewater in the presence of the organic coagulant or polymer; separating solids as a primary sludge from said primary treatment; and dewatering the primary sludge. The present invention further relates to a method of improving primary sludge dewaterability and improving energy balance of a wastewater treatment plant.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: July 7, 2020
    Assignee: Kemira Oyj
    Inventors: Joonas Likander, Sakari Halttunen, Outi Grönfors, Bengt Hansen
  • Method for controlling growth of microorganisms and/or biofilms in an industrial process
    Publication number: 20200199818
    Abstract: Disclosed is a method for controlling a biofilm, removing a formed biofilm and/or controlling a growth of microorganisms, preferably bacteria, in an aqueous environment of an industrial manufacturing process including a cellulosic fibre material.
    Type: Application
    Filed: August 28, 2018
    Publication date: June 25, 2020
    Applicant: Kemira Oyj
    Inventors: Jaakko Simell, Marko Kolari, Jonas Konn
  • Boosters for breakers containing iron compounds
    Patent number: 10689565
    Abstract: Methods for fracturing a subterranean formation penetrated by a well bore are provided, the method comprising the step of injecting a well treatment fluid into the well bore at a pressure and flow rate sufficient to fracture the subterranean formation, wherein the well treatment fluid comprises one or more iron-containing compounds and one or more booster compounds. The methods can be used to reduce viscosity and to facilitate the decomposition of acrylamide-containing polymers.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: June 23, 2020
    Assignee: Kemira OYJ
    Inventors: Jiang Li, Roopa Tellakula
  • Coating structure, sheet-like product and its use
    Publication number: 20200190741
    Abstract: A coating structure for a sheet-like substrate, which includes lignocellulosic fibres is disclosed. The structure includes at least one pre-coat layer including at least 70 weight-% of a first styrene (meth)acrylate copolymer polymerised in the presence of a stabiliser, having a glass transition temperature Tg ?20° C. preferably ?10° C., ?30 weight-% of inorganic platy mineral particles and 0.01-2 weight-% of at least one first thickener. The coating structure further includes a top coat layer including at least 50 weight-% of a second styrene (meth)acrylate copolymer polymerised in the presence of a stabiliser having a glass transition temperature Tg ?20° C. preferably ?10° C., ?30 weight-% of inorganic mineral particles, 0.01-5 weight-% of at least one second thickener and 0.5-30 weight-% of an antiblocking agent. Further disclosed is a sheet-like product coated with the coating structure.
    Type: Application
    Filed: June 14, 2018
    Publication date: June 18, 2020
    Applicant: Kemira Oyj
    Inventor: Tarja Turkki
  • Process for the preparation of arylsulfonylpropenenitriles by photocatalytic reactions
    Publication number: 20200190026
    Abstract: A process for a preparation of arylsulfonylpropenenitriles is disclosed. A reaction starting from arylsulfonyl iodides is catalyzed by light. The process is scalable, environmentally benign and provides the product in good yield.
    Type: Application
    Filed: August 27, 2018
    Publication date: June 18, 2020
    Applicant: Kemira Qyj
    Inventors: Toni AALTONEN, Oili KALLATSA, Jaakko SIMELL, Nina SNEIZ, Jonas KONN, Jaakko HILTUNEN, Ari KOSKINEN
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200181063
    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.
    Type: Application
    Filed: June 27, 2018
    Publication date: June 11, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • Agglomerated hemicellulose compositions, methods of preparation thereof, and processes for enriching a desired mineral from an ore
    Patent number: 10661282
    Abstract: Methods for preparing agglomerated hemicellulose compositions are provided. Agglomerated hemicellulose compositions comprising agglomerates are also provided herein. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral, wherein the process comprises carrying out a flotation process in the presence of one or more collecting agents and a depressant composition comprising an agglomerated hemicellulose composition.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: May 26, 2020
    Assignee: KEMIRA OYJ
    Inventors: Duane C. Wilson, Xihui Yin, Stephanie Kofsky-Wofford, Anna I. Casasús
  • Method for removing humic substances from an aqueous alkaline solution
    Patent number: 10662092
    Abstract: A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises —obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and —adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: May 26, 2020
    Assignee: Kemira Oyj
    Inventors: Jonni Ahlgren, Sakari Halttunen, Jussi Ruotsalainen, Maria Luhtala, Miia Niemelä
  • Method for reducing fouling of a microbial fuel cell, cleaning agent composition and its use
    Patent number: 10651491
    Abstract: The invention relates to a method for reducing fouling in a microbial fuel cell. The method comprises feeding of an influent comprising organic substance(s) into the microbial fuel cell (MFC), which comprises an anode and a cathode connected through an external electrical circuit with each other. Organic substance(s) are converted into electrical energy in the microbial fuel cell by using microorganisms, such as exoelectrogenic bacteria, and a treated flow is removed from the microbial fuel cell. A cleaning agent composition is fed simultaneously with the influent to the microbial fuel cell. The invention relates also to the cleaning agent composition and its use.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: May 12, 2020
    Assignee: Kemira Oyj
    Inventors: Mehrdad Hesampour, Hannele Havansi, Pirjo Vainio, Kirsi Kilponen
  • Method for producing paper, board or the like
    Publication number: 20200141061
    Abstract: The invention relates to a method for producing paper, board or the like. The method comprises obtaining a fibre stock comprising lignocellulosic fibres and adding a retention agent system comprising a cationic synthetic polymer to the fibre stock and forming a fibrous web from the fibre stock and drying the web. Microfibrillated non-wood cellulose is added to the fibre stock as a component of the retention agent system and sequentially with the cationic synthetic polymer.
    Type: Application
    Filed: March 29, 2018
    Publication date: May 7, 2020
    Applicant: Kemira Oyj
    Inventors: Tom Lundin, Kaisa Karisalmi, Heikki Sojakka
  • Core/shell polymer particles as surface sizing agents
    Patent number: 10640926
    Abstract: The present invention provides a core/shell polymer particle for surface sizing of cellulosic products, wherein the core polymer and the shell polymer of the core/shell polymer particle are polymerized from monomers comprising at least 40%, by weight of monomers selected from branched C3-10-alkyl (meth)acrylate, styrene, linear C1-10-alkyl (meth)acrylate, and acrylonitrile, based on the total weight of the monomers of the core/shell polymer particle; provided that the polymer of the core/shell polymer particle comprises at least 40% by weight of branched C3-6-alkyl (meth)acrylate and at least 50% by combined weight of branched C3-10-alkyl (meth)acrylate and styrene, linear C1-10-alkyl (meth)acrylate, and/or acrylonitrile, based on the total weight of the monomers of the core/shell polymer particle.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: May 5, 2020
    Assignee: KEMIRA OYJ
    Inventors: Anneli Lepo, Elsi Turunen, Tarja Turkki, Bernhard Überbacher
  • Method for treating starch in pulp, paper and board making processes
    Patent number: 10640923
    Abstract: The invention relates to a method for treating starch in pulp, paper and board making processes, in which processes recycled fibre material is used as raw material wherein the recycled fibre material is pulped in a pulper and obtaining a pulp flow comprising an aqueous phase and at least recycled fibres and starch dispersed in the aqueous phase. The method comprising the following steps: —adding amylase enzyme inhibitor and/or at least one biocide to pulp flow or to an aqueous process flow comprising starch for preventing starch degradation, and—adding an amphoteric polymer obtained by copolymerisation of (meth)acrylamide with cationic and anionic monomers to pulp flow or to an aqueous process flow comprising starch for binding starch to the fibres.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: May 5, 2020
    Assignee: Kemira Oyj
    Inventors: Matti Hietaniemi, Jaakko Ekman, Asko Karppi, Marko Kolari
  • Recovery of phosphorus compounds from wastewater
    Patent number: 10633272
    Abstract: The present invention concerns a process for recovering phosphates from wastewater by adding to the wastewater at least one organic coagulant or polymer in a mechanical treatment step that leaves dissolved phosphorus in the water phase, separating a mechanical sludge from the treated wastewater, preferably by sedimentation, flotation or filtration, carrying the phosphorus-containing treated wastewater in a post-treatment step, where at least one chemical precipitant is added to precipitate the dissolved phosphate into solid phosphates, and separating the solid phosphates from the treated wastewater to recover the phosphates.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: April 28, 2020
    Assignee: KEMIRA OYJ
    Inventors: Outi Grönfors, Hanna-Mari Kangaslahti, Bengt Hansen, Sakari Halttunen, Fazlollah Azarnoush
  • Composition, its use and method for removing and preventing wet strength resins from contaminating papermaking equipment
    Patent number: 10626355
    Abstract: Compositions and methods for cleaning wet strength resin contamination from papermaking equipment and/or for preventing wet strength resins from contaminating papermaking equipment using the compositions are disclosed. The compositions comprise an aqueous solution of a weak organic acid; a surfactant, preferably a nonionic surfactant, a divalent metal ion containing catalyst and optionally a glycol ether containing solvent.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: April 21, 2020
    Assignee: Kemira Oyj
    Inventors: Yong Zou, Yuping Luo, Anna Casasús
  • Absorbent materials, products including absorbent materials, compositions, and methods of making absorbent materials
    Patent number: 10624986
    Abstract: In various exemplary embodiments described herein, an absorbent structure (e.g., a paper material) having an applied absorbent material (e.g., an absorbent film) may be formed by treating a fiber (e.g., a cellulosic fiber) with an applied absorbent material forming system (also referred to as a “film forming system”), absorbent materials, compositions, methods of making absorbent materials, and the like.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: April 21, 2020
    Assignee: KEMIRA OYJ
    Inventors: Chen Lu, Vladimir Grigoriev, Scott Rosencrance, Henry Skoog
  • Prevention of starch degradation in pulp, paper or board making processes
    Patent number: 10626559
    Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: April 21, 2020
    Assignee: Kemira OYJ
    Inventors: Marko Kolari, Jaakko Ekman, Satu Ikävalko