The present invention relates to a process for the production of a cellulosic product which comprises providing an aqueous thick suspension containing cellulosic fibers having a fiber concentration of at least about 2% by weight; adding to the thick suspension an aluminum compound, alkaline earth metal salt and acid; diluting the obtained thick suspension to form a thin suspension; adding to the thin suspension one or more drainage and retention aids; and dewatering the obtained thin suspension. The invention further relates to a process for the production of a cellulosic product which comprises providing an aqueous thick suspension containing cellulosic fibers having a fiber concentration of at least about 2% by weight and an alkaline earth metal ion concentration of at least about 100 mg/l; adding to the thick suspension an aluminum compound and optionally an acid to obtain a pH of from about 4 to about 5.5; diluting the obtained thick suspension to form a thin suspension; adding to the thin suspension one or more drainage and retention aids; and dewatering the obtained thin suspension. The invention also relates to an aqueous composition comprising a mixture of an aluminum compound, alkaline earth metal salt and acid and the use of the composition.
The invention relates to a method of producing a substantially aqueous pigment dispersion substantially free from an organic binder comprising mixing at least one water- soluble or water-dispersible silane compound and colloidal silica particles to form 5 silanized colloidal silica particles in an aqueous dispersion whereby said at least one silane compound is mixed with colloidal silica particles in a weight ratio of silane to silica of from about 0.2 to about 1.5, mixing said silanized colloidal silica particles with an organic and/or inorganic pigment, wherein the weight ratio of silica to pigment is from about 0.001 to about 0.8 to form said substantially aqueous pigment dispersion. The 10 invention also relates to an aqueous pigment dispersion according to the method defined herein, and a pigment dispersion substantially free from an organic binder comprising silanized colloidal silica particles, wherein the weight ratio of silane to silica is from about 0.2 to about 1.5; and an organic and/or inorganic pigment, wherein the weight ratio of silica to pigment is from about 0.001 to about 0.8. 15
The present invention relates to a process of bleaching pulp derived from an alkaline pulping process having a hexenuronic acid content prior to the final bleaching stage from about 1 to about 80 mmol/kg dry pulp, said process comprising three chlorine 5 dioxide stages D0, D1, and D2, wherein the chlorine dioxide charges based on the total chlorine dioxide charge in a) D0 is from about 40 to about 60 %; b) D1 is from about 30 to about 55 %; c) D2 is from about 4 to about 20 %, and wherein the final chlorine dioxide stage D2 is 10 performed at a pH from about 2 to about 4.5. The invention also relates to a bleached pulp obtainable by the process.
The present invention relates to a method of treating an aqueous suspension of bleached pulp derived from an alkaline pulping process comprising dewatering and drying said suspension, wherein the pH of the suspension to be treated ranges from about 6.5 to 5 about 12.
The invention relates to a process for the production of hydrogen peroxide comprising a liquid-liquid extraction step, said extraction step comprising contacting an organic feed solution containing hydrogen peroxide with an extraction solvent comprising less than 5 about 30 wt% of water to achieve extraction of hydrogen peroxide to said extraction solvent and obtaining an extract containing hydrogen peroxide.
The invention relates to thermally expandable thermoplastic microspheres comprising a polymer shell made from ethylenically unsaturated monomers encapsulating a propellant, said ethylenically unsaturated monomers comprising from 20 to 80 wt% of acrylonitrile and from 1 to 70 wt% of vinyl ether having only one carbon-to-carbon double bond, the total amount of acrylonitrile and vinyl ether having only one carbon-to-carbon double bond being from 30 to 100 wt% of the ethylenically unsaturated monomers.
D21H 21/54 - Additifs d'une longueur définie ou d'une forme définie sphériques, p. ex. microcapsules ou perles
D06N 3/00 - Cuir artificiel, toile cirée ou matériau similaire obtenu par enduction de nappes fibreuses avec une substance macromoléculaire, p. ex. avec des résines, du caoutchouc ou leurs dérivés
The present invention relates to a process for the production of paper which comprises: (a) providing an aqueous cellulosic suspension; (b) separately adding to the suspension: (i) a nitrogen-containing organic compound having a molecular weight less than 1,000; and (ii) a cellulose-reactive sizing agent; and (c) dewatering the obtained suspension to form paper. The invention further relates to a process in which a nitrogen-containing organic compound having a molecular weight less than 1,000 is mixed with an aqueous dispersion of a cellulose-reactive sizing agent to form a pre-mix and which premix is added to the suspension.
D21H 23/76 - Procédés ou appareils pour l'addition de matériaux à la pâte ou au papier caractérisés par le choix des composés auxiliaires qui sont ajoutés indépendamment d'au moins un autre composé, p. ex. pour améliorer l'incorporation de ce dernier ou pour obtenir un effet combiné amélioré
The invention concerns a process for the production of chlorine dioxide, said process comprising the steps of continuously: feeding to a reactor (1) an acid, alkali metal chlorate and a reducing agent; reacting the alkali metal chlorate with the acid and the reducing agent to form a product stream (2) comprising chlorine dioxide, water and alkali metal salt of the acid; and, bringing the product stream (2) from the reactor (1) to an eductor (3) and mixing it with a gaseous motive stream (4) fed to the eductor and thereby forming a diluted product stream (5) . The invention further concerns a production unit for the production of chlorine dioxide .
The invention relates to thermally expandable thermoplastic microspheres comprising a polymer shell made from ethylenically unsaturated monomers encapsulating a propellant, said ethylenically unsaturated monomers comprising from 40 to 70 wt% of acrylonitrile, from 5 to 40 wt% of methacrylonitrile, from 10 to 50 wt% of monomers selected from the group consisting of esters of acrylic acid, esters of methacrylic acid and mixtures thereof, and said propellant comprising at least one of methane, ethane, propane, isobutane, n-butane and neo-pentane. The invention further relates to the production and use of the microspheres.
D21H 21/54 - Additifs d'une longueur définie ou d'une forme définie sphériques, p. ex. microcapsules ou perles
D06N 3/00 - Cuir artificiel, toile cirée ou matériau similaire obtenu par enduction de nappes fibreuses avec une substance macromoléculaire, p. ex. avec des résines, du caoutchouc ou leurs dérivés
The invention relates to thermally expandable thermoplastic microspheres comprising a polymer shell made from ethylenically unsaturated monomers encapsulating a propellant, said ethylenically unsaturated monomers comprising from 20 to 80 wt% of acrylonitrile, from 20 to 80 wt% of monomers selected from the group consisting of esters of acrylic acid, from 0 to 10 wt% of methacrylonitrile, from 0 to 40 wt% of monomers selected from the group consisting of esters of methacrylic acid, the total amount of acrylonitrile and esters of acrylic acid constituting from 50 to 100 wt% of said ethylenically unsaturated monomers, and said propellant comprising at least one of methane, ethane, propane, isobutane, n-butane and isopentane. The invention further relates to the production and use of the microspheres.
D21H 21/54 - Additifs d'une longueur définie ou d'une forme définie sphériques, p. ex. microcapsules ou perles
D06N 3/00 - Cuir artificiel, toile cirée ou matériau similaire obtenu par enduction de nappes fibreuses avec une substance macromoléculaire, p. ex. avec des résines, du caoutchouc ou leurs dérivés
The present invention relates to a process for producing paper which comprises: providing an aqueous suspension comprising cellulosic fibres, adding to the suspension, after all points of high shear, a cationic polysaccharide; and a polymer P2 being an anionic polymer; and, dewatering the obtained suspension to form paper.
The invention relates to a solid powdery composition comprising unexpanded thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant and from about 0.1 to about 50 wt% of at least one inhibitor selected from the group consisting of acids having a melting point below about 200°C and precursors therefore. The invention further relates to preparation and use thereof, a composition comprising a polymeric resin, preparation thereof, a process for working a polymeric resin and a material obtainable thereby.
C08J 9/32 - Mise en œuvre de substances macromoléculaires pour produire des matériaux ou objets poreux ou alvéolairesLeur post-traitement à partir de compositions contenant des microbilles, p. ex. mousses syntactiques
The invention relates to an aqueous dispersion of cellulose-reactive sizing agent containing an acid anhydride, an anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or quaternary ammonium thereof having a molecular weight less than 180 and/or having one or more hydroxyl groups. The invention further relates to a method for the preparation of an aqueous dispersion of cellulose-reactive sizing agent which comprises dispersing an acid anhydride in an aqueous phase in the presence of an anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or quaternary ammonium thereof having a molecular weight less than 180 and/or having one or more hydroxyl groups. The invention also relates to the use of the aqueous dispersion of cellulose-reactive sizing agent as a stock sizing agent or surface sizing agent in the production of paper. The invention further relates to a process for the production of paper which comprises adding the aqueous dispersion of cellulose-reactive sizing agent to an aqueous cellulosic suspension.
The present invention relates to a process for improving the absorption rate for paper products. The process comprises treating a cellulosic fibre web comprising applying to said cellulosic fibre web at least one polymer; and colloidal particles.
D21H 21/22 - Agents rendant le papier poreux, absorbant ou bouffant
D21H 23/76 - Procédés ou appareils pour l'addition de matériaux à la pâte ou au papier caractérisés par le choix des composés auxiliaires qui sont ajoutés indépendamment d'au moins un autre composé, p. ex. pour améliorer l'incorporation de ce dernier ou pour obtenir un effet combiné amélioré
An organo-modified silica based material to be used for making a stationary phase for liquid chromatography comprising a part which is unmodified silica, and a part 5 which is silica comprising organic groups bonded to the silica. A method for preparing an organo-modified silica based material comprising mixing in an aqueous medium a silica based material and an organosilane compound, and reacting the mixture. A stationary phase separation material prepared by functionalising the organo-modified silica based material is also disclosed.
The present invention relates to a process for preparing a high-yield pulp comprising a) treating a lignocellulose containing material chemically by means of an oxidising system comprising at least one non-enzymatic oxidant substantially free from ozone and chlorine dioxide and an activator at a pH from about 2 to about 6.5; and b) treating the lignocellulose containing material mechanically for a time sufficient to produce a high-yield pulp, wherein the lignocellulose containing material is chemically treated prior to and/or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b).
The invention relates to a papermaking process in which the static potential of the fibres/paper product can be controlled and reduced while enhancing the softness of the 5 produced paper product. The papermaking process comprises adding to a suspension of cellulosic fibres: (i) a smectite clay (ii) at least one anionic compound selected from anionic microparticles and anionic surfactants 10 (iii) at least one polymer which is cationic, non-ionic or amphoteric (iv) at least one non-ionic surfactant; and/or an oil, wax or fat.
D21H 21/22 - Agents rendant le papier poreux, absorbant ou bouffant
D21H 23/76 - Procédés ou appareils pour l'addition de matériaux à la pâte ou au papier caractérisés par le choix des composés auxiliaires qui sont ajoutés indépendamment d'au moins un autre composé, p. ex. pour améliorer l'incorporation de ce dernier ou pour obtenir un effet combiné amélioré
D21H 17/68 - Composés insolubles dans l'eau, p. ex. charges ou pigments siliceux, p. ex. argiles
The present invention relates to a process for the production of chlorine dioxide, said process comprising the steps of continuously: (a) feeding to a reactor (1) an acid, alkali metal chlorate and a reducing agent; (b) reacting the alkali metal chlorate with the acid and the reducing agent to form a product stream (2) comprising chlorine dioxide and alkali metal salt of the acid; (c) bringing the product stream from the reactor to an eductor (3) and mixing it with motive fluid fed (4) to the eductor and thereby forming a diluted product stream (5) ; (d) bringing the diluted product stream to a gas-liquid separator (6) where gas is separated from liquid therein; (e) withdrawing a gaseous product stream (7) comprising chlorine dioxide and inert gas from said gas-liquid separator; and, (f) withdrawing a liquid phase from the gas-liquid separator. The invention also relates to a production unit to produce chlorine dioxide.
37 - Services de construction; extraction minière; installation et réparation
Produits et services
prefabricated chemical processing plants, comprising pumps, condensers, pipes, control systems and reaction vessels for the production of chlorine dioxide planning, laying out and custom construction of chemical processing plants
