163results about "Bleaching agents addition" patented technology

A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.

The present invention relates to a method of increasing the brightness of pulp, pulp made from such methods and methods of using such pulp.

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.

Oxidative compositions and processes that preserve and enhance the brightness and improve color of pulp or paper when applied during different stages of the papermaking process are identified. The oxidative composition and method maintains and/or enhances brightness, prevents yellowing, and enhances the performance of paper products. Used in combination with optical brighteners and/or chelants the oxidative agents produce a synergistic effect not previously identified in the paper process.

A hygiene or wiping product includes at least one ply of a fibrous web containing cellulose fibers and having a graphical pattern of at least first and second areas. The ply contains a coloring compound providing a coloration of the ply in the first area. The coloring compound is at least partly chemically destroyed in the second area so that the ply is less colored in the second area than in the first area. A method for producing such a ply includes the steps of providing a fibrous web containing a coloring compound, which provides a uniform coloration in at least a portion of the web, and applying a bleaching agent to a part of the colored portion of the web to at least partly decolor the web in the part generating a pattern of at least first colored and second less colored areas.

A method for manufacturing pulp. The manufactured pulp includes at least 30 w-% nanofibrillated cellulose material measured from the dried pulp. A raw material is introduced to a system. The raw material includes cellulose. At least one type of an optical brightening agent is dosed as a refining additive to the system. The raw material is refined in the presence of the dosed optical brightening agent in at least one pre-refining stage or fibrillation stage to form fibrillar cellulose material.

Compositions and processes that preserve and enhance the brightness and improve color of pulp or paper when applied during different stages of the papermaking process are identified. The composition and method maintains and/or enhances brightness, prevent yellowing, and enhances the performance of paper products. Used in combination with optical brighteners and/or chelants the described agents produce a synergistic effect not previously identified in the paper process.

The present disclosure relates to producing paper or paperboard having improved stiffness and strength, compared to the conventional paperboard at the same basis weight. It also discloses a method of wood pulping having a significantly increased yield and providing fiber pulps with enhanced properties such as strength and stiffness. Wood chips are chemically pulped to a high kappa number, providing a rejects component and an accepts component. The rejects component is subjected to a substantially mechanical pulping process, optionally in a presence of bleaching agent, prior to blending back into the accepts component. The resulting fiber blend is washed, optionally bleached, and subjected to a papermaking process to provide paper or paperboard with enhanced strength and stiffness at low basis weight.

One aspect of the invention relates to an article of manufacture made from a pulp composition comprising an ARF pulp. In one embodiment, the pulp composition made from agricultural renewable fibers (ARF) having low Kappa number with unexpected quality sufficient for papermaking (e.g., high strength parameters and high freeness). In another embodiment, the ARF pulp has ISO brightness of 60% or higher, and unexpected quality sufficient for papermaking (e.g. high strength.parameters and high freeness). In another embodiment, the ARF pulp is made from a pulping process comprising using a high concentration of anthraquinone (AQ).

Aiming at current situations of cotton and wood dissolving pulp, characters of bamboo material and many disadvantages existing in the existing whiten method for preparing dissolving pulp, the invention provides a whiten method for preparing bamboo material chemical dissolving pulp. The chemical dissolving pulp produced by the invention can be widely applied to derivant industry of celluloses, such as spinning viscose fiber, cellulose nitrate, acetate fiber, etc. The whiten method in the invention uses element-free chlorine bleaching or total chlorine free bleaching, thereby solving the problems existing in the whiten method of bamboo material chemical dissolving pulp and preparing bamboo material chemical dissolving pulp high-efficiently with low energy consumption, low material consumption and low pollution.

The invention discloses an improved pulp bleaching technique for reed pulp paper-making, which comprises: first, using deoxylignin for bleaching, wherein, slurry concentration 8-20%, temperature 85-130Deg, oxygen consumption quanity 1-4.5Kg per ton slurry, NaOH consumption quanity 1-4Kg per ton slurry, and MgSO4 consumption quantiy 0.1-1.0%; second, using biological enzyme for bleaching, wherien, enzyme adding quanity 20-80g per ton slurry, temperature 30-80Deg, slurry concentration 5-16%, pH value 5-12, slurry hardness 2-8(KMnO4), and time 0.5-4h; third, adding hypochlorite for bleaching. This invention can reduce bleachability and back-yellow value, improves yield and slurry hardness, and decreases pollution to environment.

The invention discloses a high-whiteness bleaching method for high-yield bamboo wood pulp. The high-whiteness bleaching method comprises the following steps: firstly, using an extruder to carry out enhanced mechanical treatment on pretreated bamboo sheets; using a transition metal ion remover and the like to carrying out chemical impregnating treatment on extruded cizu materials; then, carrying out secondary spiral extrusion before pulping, straightening and screening; secondarily, using a peroxide activating agent and peroxide to carry out the activating treatment of 20 percent by weight of bamboo pulp at a treatment temperature of 60-90 DEG C for 30-60 minutes; thirdly, using a chlorine-free bleaching medicine H2O2 to carry out high-concentration rested bleaching of 10-30 percent by weight of bamboo pulp at a treatment temperature of 60-90 DEG C for 60-180 minutes; and using a decoloring agent of thiourea dioxide to decolour the bamboo pulp, remove a ground color, adjust a color phase and improve the bleaching white content. The invention forcefully and mechanically treats the bamboo sheets, synchronously realizes pulping, the removal of transition metal ions and deep extractionsand the break of complex cells, reduces the consumption of the bleaching medicine and improves the bleaching efficiency.

A water hyacinth fiber pulp used as fibrous raw material for paper making is provided, which is made from fibers of water hyacinth plant of the Pontederiaceae family by paper pulp process technique. The water hyacinth fiber pulp is characterized in that the fiber pulp contains water hyacinth fibers, calcium hydroxide, talc powder, kaolin and titanium dioxide. The water hyacinth contains high-quality fibers and the fiber pulp processed from water hyacinth is used as chemical raw material for paper making and cellulose production. The invention utilizes water hyacinth fibers as raw material, which is improvement of the prior art, and helps to protect environment and restore ecological balance and simultaneously solves the problem that the water hyacinth enrichment causes the blockage of water transport, resulting in the hazard to global traffic. The invention changes waste water hyacinth to a new resource for human beings. The invention has significant social value as well as economic value.

The invention provides a composition of matter and a method, which enhance the process of mechanically pulping paper precursors. The composition of matter includes a small quantity of a reducing agent and a source of alkali. When added to the pulped material, e.g., wood chips, before or during mechanical pulping, the composition reduces the energy cost of the operation. In addition, not only does the composition also does not reduce the brightness of pulp, the composition can also enhance the effectiveness of subsequent bleaching processes.

The invention discloses a stable peroxyacetic acid solution, a preparation method of the stable peroxyacetic acid solution, and a stabilizer for preparation of the stable peroxyacetic acid solution. The stabilizer comprises a component A and a component B. The component A is a diethylene triamine penta (methylene phosphonic acid) aqueous solution having the concentration of 45 to 55 wt% or an amino trimethylene phosphonic acid aqueous solution having the concentration of 45 to 55 wt% or a mixture of the diethylene triamine penta (methylene phosphonic acid) aqueous solution and the amino trimethylene phosphonic acid aqueous solution. The component B is a sodium hydroxide aqueous solution which has the concentration of 10 to 15 wt% and is added with 50 to 100ppm of complexation components. The stable peroxyacetic acid solution comprises 5 to 25% of peroxyacetic acid, 15 to 25% of hydrogen peroxide, 0.04 to 0.06% of the component A, 0.15 to 0.25% of the component B and the balance water.The stable peroxyacetic acid solution can be stored at a normal temperature for 18 months or more, has good stability, and effectively solves the safety and economy problems of the existing peroxyacetic acid solution. The stable peroxyacetic acid solution has a simple formula, does not contain components of lead, arsenic and sulfates limited by the GB19104-2003 standard, and has environmental benefits.

The invention relates to an environment-friendly energy-saving cyclic-type pollution-free pulping process and a system device thereof. The process comprises the following procedures of cutting material, screening, dedusting, thinning raw material, integrating steaming with bleaching, grinding pulp, screening, purifying, concentrating, treating water, granulating, supplying heat and generating electricity through biomass gasification, etc. The procedure of integrating steaming with bleaching comprises the following processes of presoaking, steaming, cooking and bleaching the raw material, wherein a presoaking agent is added to carry out presoaking for 30-60 min at a temperature between 50 and 100 DEG C; a steaming- cooking agent is added after presoaking, and oxygen is supplied to carry out steaming- cooking delignification reaction at the same time, with oxygen pressure kept between 0.1 and 0.3 MPa, for 45-90 min, at a temperature between 60 and 100 DEG C; bleaching agent is added after steaming- cooking, and the oxygen pressure continues to be kept, and bleaching reaction is carried out for 45-120 min at a temperature between 60 and 100 DEG C. The pulping process solves the pollution problems of lack liquor from pulping, especially straw pulping, washing sewage, discharged waste residue, etc., and solves the problem that is complex working procedure and serious pollution widely exist in the prior pulping in a real sense.

The invention discloses air flame-retardant air filter paper which comprises raw paper and an imprgnant for impregnating the raw paper, wherein the raw paper comprises glass fibers, cotton linter pulp treated by alkali, polylactic acid fibers, a defoaming agent, a dispersant,a wet strength agent, a water-proofing agent and a brightening agent; the imprgnant comprises phenolic resin, styrene-acrylic emulsion, normal hexane, methanol, N-hydroxymethyl acrylamide, a wetting agent, a flame retardant N, N '-piperazinetetra(phenol) phosphoramidate and a flame retardant decabromodiphenyl ethane. The invention further discloses a preparation method for the flame-retardant air filter paper. The air filter paper prepared by the preparation method is remarkable, high and lasting in flame retardant efficiency, has no great effect on the mechanical performance of the filter paper, and can be widely applied to the field of engines.

The invention discloses high-gloss and waterproof photographic paper. The high-gloss and waterproof photographic paper comprises an ink-absorbing layer, a lustering layer, raw paper and a back coating. A preparation method of the high-gloss and waterproof photographic paper comprises a preparation method of ink-absorbing coating liquid, a preparation process of lustering coating liquid, a preparation process of back-coating coating liquid and a preparation process of the high-gloss and waterproof photographic paper. According to the high-gloss photographic paper produced by the method, the glossiness can reach above 80 percent and is far more than that of photographic paper with the glossiness being 40 to 60 percent in the market; meanwhile, the high-gloss photographic paper has scratch resistance and the surface hardness of the photographic paper reaches level 7; the back side is coated with polymer emulsion, so the isolating effect and the anti-curl effect are achieved; and the surface tension of the back side is less than 25 dynes, so water cannot be spread on the surface. The flatness reaches the level of coated paper. The ink-absorbing drying rate is high, the effect that the paper is dry once being discharged out of a machine is achieved, and the drying rate is greatly increased compared with the drying rate, that the coated photographic paper is dry 2 minutes later when being discharged out of the machine, of the coated photographic paper.

A hydrogen peroxide stabilizer composition in paper pulp bleaching contains the following materials by the weight percentages: ethylenediaminetetraacetic acid 8%-10%, polyacrylic acid 3%-5%, nitrilortiacetic acid 5%-10%, hydroxy ethylidene-1, 1-diphosphonic acid 5%-8%, sodium hydroxide in suitable amount and the rest of deionized water,. The preparation method includes: mixing the materials in the material ratio, adjusting the pH value to 6.8-7.1 with the sodium hydroxide and adding the deionized water to 100%. The inventive hydrogen peroxide stabilizer composition in the paper pulp bleaching can reduce the decomposition rate of the hydrogen peroxide to less than 20%, prevent the fouling from generating and dispersing pulp fibers and chelating metal ions.

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 (CTMP), and (b) papers made from wood pulps, with a water-soluble phosphine or a phosphonium compound preferably containing at least one phosphorus hydroxyalkyl bond/linkage, for example a phosphorus hydroxymethyl bond/linkage (P-CH2OH). One example of such a water-soluble phosphine is the commercially available, tris(hydroxymethyl)phosphine (THP), P(CH2OH)3. One example of such a phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl.