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公开(公告)号：US11993895B2
公开(公告)日：2024-05-28
申请号：US17282451
申请日：2019-10-02
申请人： ANDRITZ OY
发明人： Marco Andrade , Ronny Geiger , Vesa Kaipainen , Auvo Kettunen , Petri Tarjavuori , Viridiane Vianna
摘要： A method for feeding a slurry of chips and liquid to a prehydrolysis reactor in the production of dissolving pulp. The slurry is pumped by using at least one pump to the reactor, and alkali is fed into the at least one pump 5 for adjusting the pH of the slurry to a range of 7-10.
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公开(公告)号：US20240052566A1
公开(公告)日：2024-02-15
申请号：US18447930
申请日：2023-08-10
申请人： SixRing Inc.
摘要： A process to perform a controlled exothermic delignification of biomass comprises providing a system having a first vessel and a second vessel, providing a biomass comprising lignin, hemicellulose and cellulose fibers placed into the first vessel, providing an aqueous acidic composition comprising a sulfuric acid component, providing a modifier component and providing a peroxide component. The biomass is exposed to the sulfuric acid component and peroxide component, thereby creating a reaction mass. The reaction mass is mixed and the sulfuric acid, modifier and peroxide components are allowed to come into contact with the biomass for a period of time sufficient for a delignification reaction to occur and to remove a predetermined amount of the lignin from the biomass. The predetermined amount is assessed by testing a first kappa number of the biomass. When the first kappa number of the biomass is reached, the biomass is transferred to the second vessel.
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公开(公告)号：US11598049B2
公开(公告)日：2023-03-07
申请号：US16464259
申请日：2017-11-23
申请人： SUZANO S.A.
摘要： The present invention refers to the separation of cellulose pulp into distinct fractions with different draining and morphological characteristics, as well as the use of part of these fractions for the production of nanocellulose. The process in reference combines the unitary operations of fiber separation, thickening to a certain consistency, draining and drying of the cellulosic pulp with the high drainage ability and production of nanocellulose from high primary fines content pulp. The process may consider any cellulosic pulp fiber derived from short or long fiber woods such as Eucalyptus, Corymbia, Birch, Aspen, Pinus, recycled fibers, etc., their residues such as bark, sawdust, etc.
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公开(公告)号：US20220162802A1
公开(公告)日：2022-05-26
申请号：US17611831
申请日：2020-05-18
申请人： RICOLA GROUP AG
发明人： Sabin-Mihai BARA , Raymond PLACE
摘要： Paper, board and/or card and a fibrous mixture for producing the same are disclosed. The mixture includes a fraction of fibrous material got from broad-leaved plants and a fraction of pulp. The fibrous broad-leaved plant material is preferably produced from a pomace, especially a food production pomace, and is used to produce packaging for the food from which the pomace was obtained.
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公开(公告)号：US20220136171A1
公开(公告)日：2022-05-05
申请号：US17423106
申请日：2020-01-13
发明人： Nitin KOLHE
摘要： The present invention provides a method for non-catalytic delignification of biomass, without externally added catalyst, with a mixed solvent of oxygenated organic solvent and water in the presence of an oxidant, at moderate temperature and pressure. Further, the separation of delignified cellulose from liquid mixture is carried out at around equivalent process conditions. Low modified kappa number delignified cellulose is obtained after separation of a liquid mixture containing a mixed solvent, hemicelluloses, lignin and traces of miscellaneous compounds. Furthermore, the method has lower chemical consumption in the downstream process, ease of operation and robustness.
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公开(公告)号：US20220018065A1
公开(公告)日：2022-01-20
申请号：US17297781
申请日：2019-11-15
发明人： Paul KROCHAK , Klas JOHANSSON , Fredrik BERTHOLD , Eric JOHANSSON SALAZAR-SANDOVAL , Erika TÖNNERFORS , Frédéric POUYET
摘要： The present invention relates to a method of producing holocellulose fibres by treating a wood-based raw material with an organic peroxide, wherein the method comprises charging the organic peroxide continuously to the wood-based raw material during the treatment and/or charging the organic peroxide to the wood-based raw material in at least two separate steps with an intermediate alkaline treatment step. Additionally, a process for the production of paper comprising the steps of preparing a papermaking stock comprising an aqueous pulp slurry comprising cellulosic fibres and having a fibre consistency of from 0.1 to 40% by weight, wherein the cellulosic fibres comprise or consist of holocellulose fibres, and wherein the amount of the wood-based holocellulose fibres is from 0.5 to 100% by weight, based on the total weight of the stock; providing the stock to a wire and form a web; dewatering the web; and drying the web is claimed. By the method affordable way to produce holocellulose fibres usable in the process to provide paper with high strength is provided, while effective dewatering can be obtained during the manufacturing process.
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公开(公告)号：US20210207321A1
公开(公告)日：2021-07-08
申请号：US17059550
申请日：2019-05-31
申请人： NOVOZYMES A/S
摘要： The present invention relates to treatment of dissolving pulp with a lytic polysaccharide monooxygenase. The lytic polysaccharide monooxygenase treatment results in reduced viscosity and/or improved viscosity control in the dissolving pulp production process and/or 5 increased reactivity of the dissolving pulp.
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公开(公告)号：US10995453B2
公开(公告)日：2021-05-04
申请号：US16793099
申请日：2020-02-18
申请人： GP Cellulose GmbH
发明人： Arthur J. Nonni , Charles E. Courchene , Phillip R. Campbell , Steven C. Dowdle , Joel M. Engle
摘要： A bleached softwood kraft pulp fiber with high alpha cellulose content and improved anti-yellowing is provided. Methods for making the kraft pulp fiber and products made from it are also described.
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公开(公告)号：US20200283953A1
公开(公告)日：2020-09-10
申请号：US16884296
申请日：2020-05-27
申请人： ANDRITZ INC.
摘要： A system and process of producing pulp from lignocellulosic material after the lignocellulosic material has undergone compression (pressurization), maceration and removal of extractives produced during compression and maceration followed by chemical addition, fiberization, digestion (cooking) and further mechanical refining.
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公开(公告)号：US20190301094A1
公开(公告)日：2019-10-03
申请号：US16464259
申请日：2017-11-23
申请人： FIBRIA CELULOSE S.A.
摘要： The present invention refers to the separation of cellulose pulp into distinct fractions with different draining and morphological characteristics, as well as the use of part of these fractions for the production of nanocellulose. The process in reference combines the unitary operations of fiber separation, thickening to a certain consistency, draining and drying of the cellulosic pulp with the high drainage ability and production of nanocellulose from high primary fines content pulp. The process may consider any cellulosic pulp fiber derived from short or long fiber woods such as Eucalyptus, Corymbia, Birch, Aspen, Pinus, recycled fibers, etc., their residues such as bark, sawdust, etc.
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