Abstract: The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural. The method is applicable to herbaceous plants, in particular.

Abstract: This invention relates to a method of producing modified fluff pulp comprising treating cellulose pulp with a nitroxide-mediated oxidation method and fluffing the treated cellulose pulp. The invention further relates to the modified fluff pulp prepared therefrom and absorbent articles comprising the modified fluff pulp.

Abstract: The invention relates to the use of certain lipolytic enzymes such as cutinases and lipases in the manufacture of paper and paper products from recycled paper. Examples of such enzymes are derived from strains of Humicola, Candida, Fusarium and Pseudomonas. By use of these enzymes, the problems relating to the so-called “stickies” derived from waste paper are reduced.

Abstract: A paper product containing hardwood fibers that are treated with certain hydrolytic enzymes, such as endo-glucanases, is provided. Moreover, the paper product includes other types of fibers, such as softwood fibers, that may also be treated with certain hydrolytic enzymes. In addition, other ingredients, such as cross-linking agents, debonders, strength agents, etc., can be applied to further enhance the properties of the paper product. In particular, paper products formed according to the present invention can be strong, soft, and have low lint and slough production.

Abstract: A cellulosic pulp, method of producing the pulp, and associated paper product produced therefrom produced by providing mercerized cellulosic fibers and depositing a hemicellulose coating upon the mercerized fibers. The hemicellulose is deposited upon the fibers by combining a hemicaustic solution with the mercerized fibers in the presence of an acidifying agent. When formed into a paper sheet, the invented fibers form a highly porous paper having improved strength and reduced dusting.

Abstract: 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 invention are advantageously less expensive to produce but retain the desirable strength of conventional lyocell products.

Abstract: Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.

Abstract: A method of controlling micro-organisms during peroxide bleaching of cellulose pulp comprising adding to the pulp an effective micro-organism controlling amount of

Abstract: Bleached, Kraft chemical pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In one embodiment, the pulp has a hemicellulose content greater than about 17 weight percent as measured by the 18% caustic solubility test. In another aspect, a method for making wood cellulose pulp having increased hemicellulose content compared to conventional Kraft chemical pulps. In the method, a lignocellulosic material is pulped in caustic sulfide to provide a first brownstock, which is treated with oxygen to provide a second brownstock, which is then bleached to provide the pulp product.

Abstract: The invention relates to a method for delignifying lignocellulosic raw materials by using sulfites in the presence of an alkaline component, especially sodium hydroxide or sodium carbonate or a mixture thereof in an aqueous solution at a high temperature and high pressure. The invention is characterized in that a first partial fragment of the alkaline component is added when the aqueous solution starts to decompose and in that at least a second partial fragment of the alkaline component is added only when delignification begins.

Abstract: 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 invention are advantageously less expensive to produce but retain the desirable strength of conventional lyocell products.

Abstract: The present invention relates to a biopulping method, and more particularly to a biopulping method for non-woody fiber plants. A biopulping method for a non-woody fiber plant is provided. It includes steps of providing a culture solution, adding a non-woody fiber plant to the culture solution, adding a microorganism suspension to the culture solution, fermentatively culturing the culture solution for preparing a pulp solution, boiling the pulp solution, pulping the pulp solution, and screening the pulp solution for isolating the paper pulp from the pulp solution.

Abstract: 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 individualized fibers to protect the fibers from fungi, bacteria, mold and algae attacks. The biocides selected have strong affinity to cellulose and do not interfere with cement hydration reactions. This invention also discloses the formulation, the method of manufacturing and the final fiber cement products using the biocide treated fibers.

Abstract: A method to enhance brightness in Chemical and Mechanical pulps comprising adding an organic sulfide chelant is described and claimed.

Abstract: In a new process for preparing pulped wood chips for paper making, chips from a hardwood such as eucalyptus are inoculated with aliving culture of one or more white rot fungi. The fungi propagate throughout the body of the wood chip, selectively attacking the lignin of the wood without harming the cellulosic fibers. Subsequent mechanical pulpting results in reduced utilization of energy, improved strength, and reduced cooking time.

Abstract: Pulp, containing black liquor, is separated to produce pulp substantially free of black liquor. An organic solvent forms a layer within a vessel and adding a pulp containing black liquor will establish three layers. From the lower layer, pulp substantially free of black liquor is removed. From the upper layer, black liquor substantially free of pulp is removed, and the layer of organic solvent is retained in place within the vessel. The resulting separation, by dissimilar densities of the organic solvent and pulp containing black liquor produces black liquor devoid of additional dilution by water whereby pulp containing black liquor is separated to create pulp substantially free of black liquor and provides black liquor separated from the organic solvent.

Abstract: A substantially sulfur free process for the manufacturing of a chemical pulp with an integrated recovery system for recovery of pulping chemicals is carried out on in several stages involving physical and chemical treatment of lignocellulosic material in order to increase accessibility of the lignocellulosic material to reactions with an oxygen-based delignification agent. Spent cellulose liquor comprising lignin components and spent chemical reagents is fully or partially oxidized in a gas generator wherein a stream of hot raw gas and a stream of alkaline chemicals and chemical reagents is formed for subsequent recycle and reuse in the pulp manufacturing process.

Abstract: The invention relates to a process for the treatment, in particular for the roughening, of the surface of hydrated cellulose shaped articles, in which at least one cellulase is allowed to act on the surface and is then inactivated permanently. The tubular films modified in this way are particularly suitable as foodstuff casings, specifically as sausage casings.

Abstract: The present invention discloses methods of bleaching chemical pulp that combine xylanase enzymes with hydrogen peroxide, peracids, or a mixture. The method comprises the steps of carrying out a chemical pulping operation, optionally followed by delignifying the pulp with oxygen, then combining xylanase enzymes with hydrogen peroxide, peracids, or a mixture to bleach the pulp. The method allows the mill to use both xylanase and peracids in a single bleaching tower to decrease the usage of chlorine dioxide and other bleaching chemicals. The pulp bleaching method of the present invention may be performed in a pulp mill as part of a complex pulp bleaching process.

Abstract: The invention relates to a method for separating hemicelluloses from a biomass containing hemicelluloses. Said method comprises the following steps: a) the hemicelluloses are extracted from the biomass containing hemicelluloses by means of treatment with a complex compound in an aqueous solution, forming a soluble hemicellulose complex, and b) the complexed hemicelluloses are separated from the biomass. The inventive method is especially suitable for producing high-quality chemical conversion pulp from raw cellulose. Not only does the inventive method enable the obtained products to have a high degree of purity, but it is also extremely economical and causes few emissions. The inventive method is also characterised in that polymer hemicelluloses in a pure form can be obtained as by-products.

Abstract: In a new process for preparing pulped wood chips for paper making, chips from a hardwood such as eucalyptus are inoculated with a living culture of one or more white rot fungi. The fungi propagate throughout the body of the wood chip, selectively attacking the lignin of the wood without harming the cellulosic fibers. Subsequent kraft pulping with standard chemicals results in less chemical usage, reduced utilization of energy, improved strength, and reduced cooking time.

Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs digester additive, which comprises a sultaine or mixtures of a sultaine with a nonionic surfactant selected from the group consisting of (a) polyglycosides, (b) polyoxyalkylene glycols, and (c) mixtures thereof as digester additives. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of woodchips into pulp. The invention also relates to the digester additive compositions.

Abstract: The present invention concerns a method for enzymatic treatment of lignocellulosic materials which contain xylan-polymers, such as cellulose kraft pulps. According to a method of the present kind, at least a part of the hexenuronic acid groups present in the material is selectively removed in order to remove metal ions from the pulp, to change the surface charge thereof, to improve the brightness stability of the pulp and to render the material more suitable for enzymatic treatment.

Abstract: A process for the preparation of concentrated solutions or suspensions of anionic organic compounds is described, which process comprises a) acidifying an aqueous solution or dispersion of an anionic organic compound that comprises salts and/or impurities to a pH of 4.5 or less, if the pH is above that value, so that the anionic organic compound becomes insoluble in water and precipitates out in the form of the free acid, b) bringing the suspension obtained from the previous step to a salt content below 2% by weight, based on the total weight of retentate, by means of ultra-filtration with a ceramic membrane or an acid-resistant organic membrane having a pore size of from 1 to 20 nm, and c) optionally washing out of the salts with water at a pH of less than 4.

Abstract: A process for producing paper and absorbent products of increased strength includes extracting wood particulates with a solvent selected from methanol, ethanol, and acetone at a pressure less than 50 psi to reduce the pitch and volatile organic compounds of the particulates without significant dissolution of lignin and cellulosic components. The wood particulates are pulped to produce a pulp with reduced pitch content. A slurry is prepared from the pulp and used to form paper products.

Abstract: Pulp, containing black liquor, is separated to produce pulp substantially free of black liquor. An organic solvent forms a layer within a vessel and adding a pulp containing black liquor will establish three layers. From the lower layer, pulp substantially free of black liquor is removed. From the upper layer, black liquor substantially free of pulp is removed, and the layer of organic solvent is retained in place within the vessel. The resulting separation, by dissimilar densities of the organic solvent and pulp containing black liquor produces black liquor devoid of additional dilution by water whereby pulp containing black liquor is separated to create pulp substantially free of black liquor and provides black liquor separated from the organic solvent.

Abstract: A method of dewatering an aqueous cellulosic pulp slurry comprising adding to an aqueous slurry of washed cellulosic pulp an effective dewatering amount of a mixture of one or more nonionic surfactants and one or more anionic surfactants.

Abstract: A method to enhance brightness in Chemical and Mechanical bleached pulps comprising adding an organic sulfide chelant to the Chemical and Mechanical pulp.

Abstract: Various types of paper pulp are bleached in two steps at atmospheric pressure and at a temperature of less than or equal to 100° C. The first step is carried out by bringing the raw pulp into contact with a mixture of peracetic acid and performic acid. The second step is carried out by treating the bleached pulp obtained from the first step, with a solution of sodium hydroxide and hydrogen peroxide. The pulps obtained have a high brightness value and a degree of polymerization close to the raw pulps. The method is ecological and nonpolluting.

Abstract: An environmentally friendly (ECF), yet commercially viable, process produces fully bleached (typically having a brightness of over 89 or 90% ISO) cellulose pulp using a (ZEND) treatment. Typically pulp is produced in an essentially sulphur-free pulping process (such as an soda/AQ process), and is then treated by a D-EO-, D-EP-, or D-EOP-sequence before the (ZEND) treatment. Optional oxygen delignification may also be used, and subsequent elemental-chlorine-free bleaching sequences may also be employed, although normally not necessary since the pulp after the (ZEND) treatment has high brightness and good viscosity (e.g. over 21 cP).

Abstract: A method is provided for bleaching a non-cotton cellulosic fiber, yarn or fabric by contacting said fiber, yarn or fabric with a hemicellulase enzyme for a time and under conditions suitable to produce a whitening of said fiber, yarn or fabric.

Abstract: The present invention relates to a bacterial strain of accession number MTCC 5098 useful for reducing the Total dissolved solids (TDS) levels from pulp and paper waste water effluents, and a process for the preparation of innoculum of the strain and also, a method of reducing Total dissolved solids (TDS) from pulp and paper waste water effluents using the said strain.

Abstract: This invention is a method of reducing the resin content of chemical pulps comprising heating wood chips in an aqueous alkaline medium in the presence of an effective deresinating amount of an alkyl alcohol alkoxylate of formula RO[(CH2CHCH3O)x(CH2CH2O)y]M wherein R is C4 to C40 alkyl; x is 1-50; y is 0-100 and M is H or an alkali metal, a cooking liquor comprising sodium hydroxide and sodium sulfite and the alkyl alcohol alkoxylate and a deresinated pulp prepared according to the method.

Abstract: The present invention relates to an environment friendly, safe, and efficient four-step method of bio-bleaching Kraft pulp using bacterial strains of accession no. MTCC 5096, MTCC 5094, MTCC 5095, and MTCC 5098, a microbial consortium comprising a synergistic mixture of ligninolytic bacterial isolates of accession no. MTCC 5094, MTCC 5095, and MTCC 5098, bacterial strains of accession Nos. MTCC 5096, MTCC 5094, MTCC 5095, and MTCC 5098, and a process of preparing an inoculum of the bacterial isolate of accession no. MTCC 5096, further, a process for the preparation of a consortium comprising the ligninolytic bacterial isolates of accession nos. MTCC 5094, MTCC 5095, and MTCC 5098, in addition, a process for the preparation of pulp suspension for the bio-bleaching.

Abstract: Polynuclear compounds dissolved and contained within an organic solvent are separated from the organic solvent by rendering the organic compounds insoluble within the organic solvent. Accordingly this invention removes polynuclear compounds from a saturated organic solvent. The polynuclear compounds are derived from black liquor obtained from kraft digestion. Whereby polynuclear compounds, substantially free of an organic solvent, are obtained from the organic solvent.

Abstract: An anionic cellulose ether obtainable by a process comprising reacting an alkali metal cellulose with one or more reagents A selected from the group consisting of haloacetic acids, alkali metal haloacetates, alkali metal vinyl sulfonates, vinyl sulfonic acid, and precursors thereof, and one or more reagents B having the formula R1—(OCH2CH(R2))n-P, wherein R2 represents hydrogen or a methyl group; n is 0-2; P represents a glycidyl ether group, a 1,2-epoxy group or a precursor thereof, if P represents a glycidyl ether group, R1 represents a linear C3-C5 alkyl group, optionally containing an oxygen atom, a phenyl group, or a benzyl group, and if P represents a 1,2-epoxy group, R1 represents a linear C3-C5 alkyl group, optionally containing an oxygen atom. Preferably, reagent A is chloroacetic acid and reagent B is n-butyl glycidyl ether. The invention also relates to the use of said anionic cellulose ether as an associative thickener, rheology modifier or stabilizer.

Abstract: A method is provided for deinking paper. Repulped paper is treated with a deinking comprising a triglyceride. A preferred triglyceride is beef tallow. The deinking composition reduces foaming and increases brightness.

Abstract: A method for selectively delignifying lignocellulosic materials and bleaching of pulp and dyes using a combination of an oxidative enzyme and a metal complex. More specifically, the process involves the oxidation of a transition metal redox complex by a phenol oxidizing enzyme such as laccase or peroxidase to mediate the catalytic delignification of chemical pulp and bleaching of textile dye. This process is unique in that only a catalytic amount of metal complex mediator is required on softwood or hardwood kraft pulp, and that recycling or regeneration of the mediator for further pulp delignification is possible. The redox mediator is characterized in that it contains a transition metal ion coordinated with molecules or ions in such a way that the complexes have a formal redox potential between 0.5 and 1.2 volt measured against a normal hydrogen electrode.

Abstract: Depolymerized lignins contained within black liquor are transferred to an organic solvent, soluble in organic matter and insoluble of aqueous sodium compounds contained within the black liquor. Upon separation of the aqueous sodium compounds from the organic solvent, saturated with contained depolymerized lignins, depolymerized lignins are removed from the organic solvent to result in depolymerized lignins and a separated organic solvent suitable for recycling. Resulting aqueous sodium compounds are concentrated by a multiple effect evaporator to provide liquor to digest wood chips. Whereby depolymerized lignins, substantially free from sodium compounds, are separated from a black liquor. Accordingly this invention modifies black liquor without employing a lime kiln and a recovery boiler, producing a molten smelt.

Abstract: Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected phosphonate or carboxylate compound or mixtures thereof is admixed with the alkaline aqueous mixture in the digester of the chemical pulping process. The compositions and method are especially well suited for use in the Kraft pulping process.

Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of wood chips into pulp. The invention also relates to the digester additive compositions.

Abstract: 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 without significant dissolution of lignin and wood cellulosic components. The solvent used is methanol, ethanol, or acetone. This is followed by comingling the extracted wood particulates with a liquor having chemical reactants, not including the solvent used to extract the wood particulates, for solubilizing lignin. Then, allowing the chemical reactants of the liquor to react with lignin contained in the extracted wood particulates under controlled conditions of temperature and pressure for a sufficient time to solubilize and remove lignin. This is followed by producing a wood pulp having individual cellulosic fibers while releasing a reduced amount of VOCs in the wood pulping process.

Abstract: Papermaking fibers are treated with certain hydrolytic enzymes, specifically including cellulases, such as truncated endo-glucanases, which have been freed of their cellulose binding domain, to generate aldehyde groups at or near the surface of the fibers. Paper sheets made from the resulting fibers exhibit improved strength characteristics relative to paper sheets made from untreated fibers.

Abstract: A paper product having a mass of cellulosic fibers produced from wood, where the fibers have a pitch content reduced by at least about 40% as compared to an expected pitch content based on naturally-occurring levels of pitch in the wood is disclosed.

Abstract: This invention relates to a biological process for deinking of office waste paper and more particularly, the present invention relates to a biological process for deinking of xerographic and inkjet printed paper using a gram-negative coccoid bacterium deposited at National Institute of Oceanography, Dona Paula, Goa 403 043, India having accession No. NIO/DI/32 and being deposited at an international depository ______ having accession number ______ and also deposited at Microbial Technology, Chandigarh, India having accession No. ______.

Abstract: 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 allowing the fungus to modify the lignin, and pulping the degraded wood chips by a kraft process.

Abstract: A process for producing paper materials having improved wet strength. This process involves (a) preparing a suspension of unbleached or semi-bleached chemical or semichemical pulp or pulp from recycled fibers; (b) treating the pulp with a phenol-oxidizing enzyme and a mediator; and (c) de-watering the treated pulp in a paper making machine to remove process water and produce the paper material. Preferably, the paper material is heated after the completion of step (c). By the process of the invention, the wet strength of paper materials can be improved without using wet strength resins which makes the product more easily re-used. Further disclosed is a process for producing corrugated paperboard or corrugated containers.

Abstract: A process for bleaching substantially lignin-free pulp or paper in a single-stage bleaching process or multi-stage bleaching process; comprising

Abstract: Provided are methods of deacidifying a cellulose-based material by providing a deacidification composition comprising a hydrofluorocarbon and a deacidification agent dispersed within the hydrofluorocarbon, and contacting the cellulose-based material with the composition to increase the pH associated with the cellulose-based material. Also provided are deacidification compositions for use in the present methods.

Abstract: A method and device for bleaching chemical paper pulp or dissolving wood pulp, which has been cooked and delignified without employing chlorine-containing chemicals, comprising a bleaching sequence which comprises optionally a first stage comprising a chelation treatment step; a second stage comprising a first peroxide treatment stage, wherein said first peroxide treatment stage is a delignifying peroxide treatment stage in which the amount of peroxide is less than 12 kilo/bone dry metric tons; a third stage comprising an acidic delignifying treatment stage, following said second stage and including a wash, and a fourth stage comprising a second peroxide treatment stage, following said third stage and including a wash, wherein said second peroxide treatment stage is a bleaching peroxide treatment, in which the amount of peroxide exceeds 3 kilo/bone dry metric tons and exceeds the amount of peroxide employed in said second step.