Class 162/82 - Sulfur containing

Subclass of Class 162 - Paper making and fiber liberation
Definition: Processes in which a chemical containing sulfur is employed.
No. of patents: 96
Last issue date: 01/11/2011

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Number	Title	Issue Date
7867360	Generation of active polysulphide with manganese and bismuth catalysts Polysulphide produced by oxidizing white liquor includes both active and inactive components. “Active” polysulphide is the only component that increases pulp yield. The amount of active polysulphide formed when manganese oxides are used as catalysts in the gener...	01/11/2011
7828930	Use of polysulfide in modified cooking A method for Kraft pulping employing a modified cooking process in conjunction with polysulfide pulping technologies to obtain higher pulping yields than obtained in the prior art. The total required alkali charge (polysulfide liquor) is added to the beginning of a ...	11/09/2010
7306698	Method for producing pulp The present invention is a method for producing pulp from fibrous lignocellulose material using a treatment step which exposes the material to oxalic acid, or oxalic acid and sodium bisulfite, prior to pulping. The pulping of the resulting product requires less ener...	12/11/2007
7285181	Bleaching and brightness stabilization of lignocellulosic materials with water-soluble phosphines or phosphonium compounds A method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTM...	10/23/2007
7229525	Methods to enhance pulp bleaching and delignification A method to enhance brightness in Chemical and Mechanical pulps comprising adding an organic sulfide chelant is described and claimed. A method to enhance delignification in a Chemical pulp comprising adding an organic sulfide chelant is also described and cl...	06/12/2007
7097737	Method of making a modified unbleached pulp for lyocell products In accordance with the present invention, lyocell products can be made with unbleached pulps resulting in products with high amounts of hemicellulose and high amounts of lignin as compared to conventional lyocell products. The lyocell products of the present inventi...	08/29/2006
7056418	Cooking method for pulp A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calcu...	06/06/2006
7001484	Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent A process for peroxide bleaching of mechanical or high yield pulp, the process comprising adding to a pulp slurry at least one stabilizer for stabilizing low valency states of transition metal ions in the slurry; subsequently adding caustic soda to said slurry simul...	02/21/2006
6942754	Process for producing xylooligosaccharide from lignocellulose pulp Xylooligosaccharide is produced from a lignocellulose pulp by enzyme-treating a lignocellulose pulp with hemicellulase, filtering the resultant reaction mixture to separate a liquid fraction from the enzyme-treated pulp, subjecting the separated liquid fraction to a...	09/13/2005
6923888	Process for recovering organic acids from bleaching liquors The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid, such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtaine...	08/02/2005
6913672	Methods for analyzing boron-containing alkaline pulping liquors Chemical species (e.g., metaborate, carbonate, hydroxide and sulfide) in a boron-containing alkaline wood pulping liquor sample are determined quantitatively by (i) subjecting a first aliquot portion of the sample to a primary acid titration analysis to derive multi...	07/05/2005
6777103	Fiber cement composite material using biocide treated durable cellulose fibers A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide treated fibers have biocides attached to inner and outer surfaces of i...	08/17/2004
6758942	Process for bleaching pulp or paper A process for bleaching substantially lignin-free pulp or paper in a single-stage bleaching process or multi-stage bleaching process; comprising contacting said substantially lignin-free pulp or paper with an aqueous reductive bleaching solution comprising hy...	07/06/2004
6641699	Chemical wood pulping process with reduced pitch and VOC emissions A chemical wood pulping process having reduced volatile organic compound emissions includes extracting wood particulates with solvent at a pressure less than 50 psi to reduce naturally-occurring particulate pitch and volatile organic compound content with...	11/04/2003
6635147	Method for analyzing boron-containing alkaline pulping liquors Chemical species (e.g., metaborate, carbonate, hydroxide and sulfide) in a boron-containing alkaline wood pulping liquor sample are determined quantitatively by (i) subjecting a first aliquot portion of the sample to a primary acid titration analysis to d...	10/21/2003
6627041	Method of bleaching and providing papermaking fibers with durable curl A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency generally unde...	09/30/2003
6613192	Process for producing biokraft pulp from eucalyptus chips A method for producing paper pulp for use in the making of paper from eucalyptus wood chips. The method comprises inoculating wood chips with white rot fungi, fermenting the wood chips so as to cause a propagation of the fungus through the wood chips and ...	09/02/2003
6533896	Method for the production of precleaned pulp A method for preparing pulp from lignin-containing cellulosic material is disclosed, including a step for acid cleaning of the lignocellulosic material, followed by alkaline delignification. The acidic step removes undesired components such as metal ions ...	03/18/2003
6517729	Oxidation process of the wet oxidation or ozonization type The present invention relates to a process of oxidation, of the wet oxidation or ozonization type, of a liquid contained in a reactor. The gas of the gas headspace is aspirated into the liquid, and the portion which is not dissolved in the liquid is recov...	02/11/2003
6511578	Bleaching and delignifying cellulosic pulp using caroate/caro's acid solution The invention relates to a method of bleaching and/or delignifying cellulose, in which (a) a sodium hydroxide solution and a peroxydisulphate solution are first of all produced by electrolysis of a sulphate, (b) the peroxydisulphate solution is converted by hy...	01/28/2003
6475338	Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester The production of chemical (e.g., kraft) cellulose pulp much more suited to totally chlorine free or elemental chlorine free bleaching is produced by reducing the bleaching chemical consumability of the produced pulp. The effective alkalinity of the pulp ...	11/05/2002
6464827	Method of digesting wood with an alkaline liquor by adding an acidic agent to precipitate dissociated lignin A method for producing pulp, comprising digesting lignocellulosic wood, containing one or more xylan derivatives selected from the group consisting of xylan bound with lignin, xylan bound with hexenuronic acid, and mixtures thereof, with an aqueous alkali...	10/15/2002
6398908	Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound A process for delignification and bleaching of chemically digested lignocellulose-containing pulp. In a first embodiment, the pulp is acid treated at a pH of between about 1 and about 6, whereupon a water-soluble compound containing an alkaline earth meta...	06/04/2002
6348128	Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition A method is provided for improving causticizing efficiency in the conventional lime recausticization portion of an alkaline pulping process. Such processes are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. The ...	02/19/2002
6348127	Process for production of chemical pulp from herbaceous plants A process for production of chemical fibrous pulp for making paper, paperboard and other fibrous products from herbaceous plants, such as kenaf. Pulp from the herbaceous plant is made by a process which involves densification of pieces of all or part of t...	02/19/2002
6273994	Method and device for measuring bleach requirement, bleachability, and effectivenss of hemicellulase enzyme treatment of pulp The present invention relates to a device and method for measuring the bleach requirement and bleachability of pulp in a pulp mill. The invention enables pulp mill operators to better control bleach plants. In one aspect, the invention comprises a system ...	08/14/2001
6210527	Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream A method for producing bleached wood pulp in which wood chips are digested in polysulfide liquor to produce brown stock pulp. The brown stock pulp is washed to produce washed brown stock wood pulp and weak black liquor and the washed wood pulp is then del...	04/03/2001
6153052	Pulping process An improved pulping process by which pulp yield is increased requires using polysulfide in the cooking liquor and lignocellulosic particles having a maximum thickness of 2 mm....	11/28/2000
6143130	Polysulfide pulping process A method for impregnation and chemical digestion of lignocellulosic material and recovery of pulping liquors. A spent impregnating or cooking liquor is withdrawn and sulphurous compounds are recovered therefrom in a partial oxidation reactor. These sulphu...	11/07/2000
6110323	Methods of refining agricultural residues to absorbent cellulose, xylose, and plant nutrient liquor, and products produced by such methods A method of creating a number of separate product streams from an agricultural waste material, comprising: providing a starting material consisting of an agricultural waste material; hydrolyzing the starting material with an acid solution at atmospheric p...	08/29/2000
6103057	Kraft digesting process wherein a vapor interface is formed by withdrawing hot cooking liquor A method for use in a batch digesting process is provided which includes the removal of a portion of the hot cooking liquor from the digester prior to the cook creating a liquid-vapor interface in the digester followed by the removal or purging of the vap...	08/15/2000
6030495	Method for increasing brightness in pulp paper and polymeric materials Novel substantially odor-free polymeric thiol-containing antioxidant compounds suitable for preventing light induced brightness reversion or yellowing of pulps and papers and polymeric materials are described. The novel compounds are based on a polymeric ...	02/29/2000
5993601	Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking The invention relates to a process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking. The process is characterized in that green liquor is firstly enriched in sulphide and then oxidized....	11/30/1999
5976321	Process for making sulfur enhanced undigested cellulosic fiber material and pulp Provided is a process for making pulp having the steps of: contacting an undigested cellulosic fiber material with a pretreatment liquid formulated from a mixture comprising alkali metal bicarbonate and alkali metal hydrogen sulfide as reaction components whic...	11/02/1999
5938892	Process for recycling bleach plant filtrate A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, at least one fin...	08/17/1999
5882427	Method of reconditioning used wood Method of separating the surface layer from the core of a piece of wood is escribed. In it, the surface of the piece of wood is initially pre-damaged or roughened and the piece of wood thus treated is thereafter soaked in water or an aqueous solution until...	03/16/1999
5853535	Process for manufacturing bleached pulp including recycling A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, optionally at le...	12/29/1998
5728265	Process for enhancing white liquor penetration into wood chips by contacting the chips with a mixture of the white liquor and a polymethylalkyl siloxane The efficiency by which pulp cooking liquor components penetrate the wood and enable lignin and resins to be removed from the cellulosic materials is increased by contacting wood chips and the like with a liquid mixture comprised of white liquor containin...	03/17/1998
5662773	Process for preparation of cellulose acetate filters for use in paper making The present invention discloses a process for treating filter rods comprising cellulose acetate tow waste comprising the steps of: a. cutting said filter rods so that fiber of said cellulose acetate have a fiber length of less than about 4 inches; and b. treat...	09/02/1997
5645686	Process for bleaching a pulp in a sequence including an enzyme stage Process for bleaching a chemical paper pulp by means of a sequence of treatment stages involving at least one stage with an enzyme and at least one stage with a peroxyacid....	07/08/1997

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Class 162/82 - Sulfur containing