Kemira Oyj | Date: 2016-10-28
The invention relates to a bacterial strain belonging to the genus Rhodococcus which is a producer of a nitrile hydratase. The invention also relates to a method for producing acrylamide by hydration of acrylonitrile using a biomass of the bacterial strain and to a method of culturing the bacterial strain.
Kemira Oyj | Date: 2016-11-28
Paper strength systems including polyamine-polyamidoamine-epihalohydrin (PPAE) resin are disclosed. Also disclosed are methods of forming a paper including applying a strength system comprising PPAE to cellulosic fiber, as well as the resultant paper.
Kemira Oyj | Date: 2016-09-26
Depressants comprising a moderately oxidized polysaccharide having about 0.05 to about 4.5 mmol of anionic charge per gram at a pH of about 6 to about 7, or about 0.2 to about 5 mmol of anionic charge per gram at a pH of about 10 to about 11.2, are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more of the depressants.
Kemira Oyj | Date: 2017-04-26
The invention relates to a use of a reversible molten salt for separating hydrocarbons, such as crude bitumen and/or heavy crude oil, from material comprising mineral solids. The invention relates also to a method comprising at least the steps of: (a) bringing a liquid phase comprising a reversible molten salt, preferably a reversible ionic liquid, in a contact with mineral solids comprising hydrocarbons and extracting hydrocarbons to the liquid phase from the mineral solids; (b) separating the mineral solids phase from the liquid phase, which comprises molten salt and hydrocarbons; (c) separating hydrocarbons from the liquid phase comprising molten salt; and (d) recycling the liquid phase comprising molten salt to step (a).
Kemira Oyj | Date: 2017-01-04
The invention provides new polyvinylamide and/or acryl acid based copolymers. The new structured block copolymers are based on the block copolymerization of N-vinyl formamide (NVF) with other monomers by using a bifunctional initiator. Further, a method of preparing the structured block copolymer is provided, and especially a method wherein the NVF-based block is at least partially hydrolyzed to obtain PVAm. Also the use of the new structured block copolymers in sludge dewatering and in papermaking processes is disclosed.
Kemira Oyj | Date: 2016-10-24
Cement compositions and processes for reducing air entrainment in a cement composition generally include mixing a hydraulic cement with a defoamer composition including an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer.
Kemira Oyj | Date: 2017-05-24
The present invention provides a method for preventing or decreasing scale formation on process surfaces in manufacturing process of paper, board or the like, in which method performic acid is used as an antiscaling agent.
Kemira Oyj | Date: 2017-03-08
The invention relates a method for producing a suspension of microfibrillated cellulose. The method comprises at least the steps of obtaining an aqueous suspension of natural cellulose fibres, adding an additive consisting of at least one natural polymer to the suspension of natural cellulose fibres, and feeding the obtained mixture comprising natural cellulose fibres and the additive into a homogenizer or a fluidizer. The invention relates also to a microfibrillated cellulose obtained by the method and its use.
Kemira Oyj | Date: 2017-07-12
The invention relates to a composition for sizing of a surface of paper, board or the like and its use for increasing strength properties of paper, board or the like. The composition has a solids content of 3 30 %, and it comprises degraded non-ionic starch, and at least 0.5 weight-% of anionic polyacrylamide, which has a molecular weight, MW, > 500 000 g/mol and (FR)Linvention concerne une composition pour lencollage dune surface de papier, de carton ou similaire et son utilisation pour augmenter les proprits de rsistance de papier, carton, ou similaire. La composition a une teneur en matires solides de 3 30 %, et il comprend de lamidon non ionique dgrad et au moins 0,5 % en poids de polyacrylamide anionique, qui a un poids molculaire, MW, > 500 000 g/mol et
Kemira Oyj | Date: 2016-08-12
Depressants comprising one or more types of polysaccharides comprising one or more types of pentosan units are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more collecting agents and one or more of the depressants.