90 results about "Alkaline peroxide" patented technology

The invention discloses a bamboo chemimechanical pulp bioenzyme pretreatment method. The bamboo chemimechanical pulp bioenzyme pretreatment method comprises the following steps: feeding bamboo pieces into a steaming cabin for normal-pressure pre-steaming after screening the bamboo pieces, and then carrying out first-stage screw extrusion; adding bioenzyme in an extruded material for pretreatment, then carrying out high-temperature deactivation, washing and dewatering, then carrying out first-stage and second-stage chemical pre-impregnating in sequence, then carrying out first-stage high-consistency normal-pressure pulp grinding by using a high-consistency disc refiner of which rho is 300, and completing bleaching reaction by enabling pulp to stay in a high-consistency reaction cabin for about 50 to 60 minutes; then carrying out follow-up pulp grinding by using a disc refiner, preparing pulp samples in different Canadian freeness degrees by controlling and inputting different pulp grinding energy consumptions, respectively recording the pulp grinding energy consumption needed for preparing each pulp sample, and using the different pulp samples for paper pulp performance testing after respectively carrying out latent elimination, acidification, washing, screening and dewatering concentration. According to the bamboo chemimechanical pulp bioenzyme pretreatment method disclosed by the invention, by carrying out pretreatment on bamboo bioenzyme, compared with a traditional PRC (Preconditioning Refiner Chemical)-APMP (Alkaline Peroxide Mechanical Pulping) technology, the difference in respects of pulp grinding energy consumption and pulp performance can be observed, and a reference technology is provided for preparing chemimechanical pulp by using bamboos as raw materials.

The invention relates to an electrochemical method which produces sodium chloride and alkaline hydrogen peroxide simultaneously. The method can improve the use efficiency of the two poles of the electricity, and lower the production cost. The method adopts an electrolytic tank consisting of an anode, a cation exchange membrane, an anion exchange membrane and a cathode, wherein, the electrodes combine with the membranes in sequence to form an anode chamber, an intermediate chamber and a cathode chamber; sodium chloride solution and sodium chlorate solution are circulated to the anode chamber, sodium hydroxide solution and air is circulated to the cathode chamber and sodium hydroxide solution is circulated to the intermediate chamber; after direct current circulating among the electrodes, chlorine is produced in the anode while the oxygen in the cathode deoxidizes and produces hydrogen peroxide and the concentration of the sodium hydroxide solution in the intermediate chamber is increased; the anolyte flowing out of the anode chamber flows into an external heated reaction tank, and chlorine is transferred into sodium chlorate; the anolyte is circulated back to the anode chamber of the electrolytic tank; a part of the concentrated sodium hydroxide solution which flows out of the intermediate chamber can be used for adjusting the pH value of the anolyte without using extra sodium hydroxide, thereby lowering the running cost.

The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.

A method for bleaching cellulosic pulp is disclosed, with one embodiment revealing a three-step bleaching method for cellulosic pulp comprising an activating bleach step, an alkaline peroxide step, and a reductive bleach step. The cellulosic pulp treated according to the present invention may possess a greater GE brightness gain than if treated according to conventional methods, while not suffering a significant loss of lignin. The cellulosic pulp may comprise recycled fibers, including those with high groundwood content. The bleaching method may also decrease the pH of the pulp.

The invention discloses a method for making slight-coating light paper. The method comprises the following processing steps of: beating by using kraft pulp, Italian poplar alkaline peroxide mechanical pulp, chemi-thermo-mechanical pulp and waste paper deinked pulp, respectively, blending and adding auxiliary materials, making wet paper sheets, pre-drying, slightly coating, post-drying, press-polishing and finishing. According to the method disclosed by the invention, by the treatment way of coating the surface of the light paper slightly, not only are the quality performances, such as, whiteness, surface smoothness, printing suitability and the like, of the light paper increased greatly, but ash content of the light paper after coating is increased greatly also, so that energy consumptionis saved and production cost is reduced; the method disclosed by the invention has the obvious advantages, and has very important meanings to increase of additional values of high-yield chemi-thermo-mechanical pulp and light paper products, to improvement of quality of the products, and to reduction of production cost.

The present invention relates to hydrophilic, high quantum yield acridinium compounds. It has been discovered that the placement of electron-donating groups in the acridinium ring system increases the amount of light that is emitted by the corresponding acridinium compound when its chemiluminescence is triggered by alkaline peroxide. More specifically, it has been found that the placement of one or two hydrophilic, alkoxy groups at the C-2 and/or C-7 position of the acridinium ring system of acridinium compounds increases their quantum yield and enhances the aqueous solubility of these compounds. The present hydrophilic, high quantum yield, acridinium compounds are useful chemiluminescent labels for improving the sensitivity of immunoassays.

The present invention provides for the use of activator complexes to enhance lower temperature cleaning in alkaline peroxide cleaning systems. Compositions including an activator complex, an active oxygen source, and a source of alkalinity are applied to the surface to be cleaned at temperatures between about 5° C. and about 50° C. The methods of the present invention provide for enhanced soil removal with reduced energy, water, and chemistry consumption.

The invention discloses a method for treating organic cyanide wastewater. The organic cyanide wastewater is pretreated by reaction using the alkaline peroxide advanced oxidation method, and the pretreated wastewater is subjected to biological oxidation and nitrogen removal by the biological A/O (Anoxic/Oxic) process to obtain effluent water meeting the discharge standards of China and to realize effective treatment of organic cyanide wastewater. The invention further discloses a device for treating the organic cyanide wastewater. As an ideal and clean oxidant, peroxide does not cause secondary pollution, and can reduce biological toxicity of wastewater as well as improve the biodegradability of wastewater, the pH value is controlled in the alkaline range, and highly toxic cyanide gas can be effectively prevented from escaping; and in addition, the operation conditions are simple, and the operation can be carried out at normal temperature and normal pressure.

A process for improving optical properties of high-yield pulp (HYP) for producing paper products with superior brightness. Optical brightening agents (OBAs) can effectively improve the optical properties of high-yield pulp (HYP). The present process involves incorporating the OBAs into the alkaline peroxide bleaching process. By combining peroxide bleaching with an optical brightening agent, one can decrease the bleaching cost to reach the same brightness target. Some key advantages of adding OBA to HYP at the pulp mill over the conventional wet-end addition of OBA include: i) the quenching effect on OBA by the wet-end cationic polymers such as PEI is decreased by fixing OBA on HYP fibers; ii) the negative impact of metal ions in the white water system on the OBA performance is minimized when OBA is pre-adsorbed and fixed on HYP fibers; iii) the photo-yellowing (color reversion) of HYP and HYP-containing paper sheets is decreased when more OBA is on HYP fibers to protect them from harmful UV radiation.

A homogeneous gas-evolving composition is provided that includes an acid, a gas-evolving acid neutralizing agent, and at least one of an inorganic carbonate, inorganic bicarbonate, alkaline peroxide, or alkaline azide. A water-soluble desiccant is homogeneously intermixed with the acid and the gas-evolving acid neutralizing agent. The desiccant is present in an amount able to absorb ambient moisture equivalent to at least 0.01 total weight percent of the composition before gas evolution of more than 50% of the theoretical gas evolution available from the composition. To confer storage stability, the acid, the gas-evolving acid neutralizing agent, and water-soluble desiccant cumulatively have a water content of less than 1 total weight percent water. Through appropriate selection of a desiccant or inclusion of a surfactant foaming agent, the composition foams upon drenching with water. The composition is particularly well suited for consistent usage of glyphosate herbicide. Plant growth inhibition is provided by wetting a plant with water and then applying the composition onto the plant. After allowing sufficient time, the composition absorbs the water and evolves gas, thereby spreading herbicide on the plant preferential to surrounding soil.

The invention provides an improved P-RC APMP (preconditioning-refining chemical alkaline peroxide mechanical pulp) pulping new flow path, which is characterized in that three or four in-series double helix press masters are added behind a conventional P-RC APMP flow path bleaching tower to extract a bleaching waste liquid, the gross extraction efficiency of the waste liquid is 80-95%, the improved P-RC APMP pulping new flow path is small in water consumption when the waste liquid is extracted, the extracted waste liquid is high in solid content, within the range of 4.0-8.0%, and the extracted waste liquid is processed by means of alkali recovery, so that the steam use level when the waste liquid is concentrated by means of alkali recovery can be reduced, the washing load of the pulp at a follow-up washing workshop section can be reduced, and the negative influence of anionic trash in the pulp to a wet part of a paper section paper machine can be further reduced simultaneously.

A method for producing thermomechanical or chemi-thermomechanical pulp is provided. The process is characterized as having a reduced specific energy demand during refining. The process involves processing a pretreated wood material using one or more high consistency refining steps to produce a first pulp, optionally applying a chelating agent to the first pulp during HC refining to produce a stabilized pulp and treating the first or stabilized pulp with an alkaline-peroxide liquor to produce a treated pulp. The treated pulp is then processed by one or more second low consistency refining steps. Alternatively, the first pulp or stabilized pulp may be divided into a primary and secondary stream. The primary stream is treated with alkaline-peroxide liquor to produce a treated pulp. The secondary stream is processed using a secondary HC refining step to produce a partially refined pulp, and removing latency of the partially refined pulp and the treated pulp is removed in a common location. The treated pulp and the partially treated pulp is processed by one or more than one second low consistency refining step to produce a final pulp. The methods utilize less energy when compared with a method for producing pulp that requires both primary and secondary high consistency refining stages.

The invention provides particulate detergent compositions containing alkaline peroxide salts and organic peracid precursors, methods of treating stains with these compositions and methods of making the compositions. The compositions have long term storage stability imparted by a coating to the alkaline peroxide salt. The methods of formulating the compositions to include this coating are relatively easy and inexpensive.

Hemicelluloses may be extracted by alkaline peroxide treatment without removal of ferulate residues. Hemicelluloses prepared in this way retain their ability to gel. Such gelling hemicelluloses may be extracted with a number of different oxidizing species including hydrogen peroxide anion, hydrogen peroxide radical, hydroxyl radical, superoxide radical and oxide radical. A process has thus been developed for producing a hemicellulose gel that may be carried out at cold temperatures, thus facilitating enzymic co-processing, and that is high yielding and produces a gel that is light in color.

The invention provides coated paper, which comprises raw paper and coatings formed on two surfaces of the raw paper. Paper pulp for the preparation of the raw paper contains the following slurries of: by weight, 30-80 parts of bleached sulfate hardwood pulp, 0-30 parts of the bleached softwood pulp, 0-30 parts of bleached chemical mechanical pulp and 0-30 parts of alkaline peroxide mechanical pulp. The ash content in the raw paper is 5%-20% by weight. The paint for coating the coating layer contains matt flake china clay. By adjusting the kind and ratio of the raw paper slurries, the ash content of the raw paper to control the roughness and bulkness of the raw paper, the coated paper provided by the invention has an elegant paper color, a concavo-convex feel and a thick loose height. Furthermore, by the addition of matt flake china clay into the paint for coating the coating layer, a high coating seal performance is obtained with fewer coating weight, and the printing effect of the coated paper is good.

The invention provides an evaporation pretreatment process method for alkaline peroxide mechanical pulp, which comprises a waste liquor recovery process and an alkali recovery process, wherein in the waste liquor recovery process, filter water in the production process of the alkaline peroxide mechanical pulp is collected to a waste liquor intermediate pond, and in the alkali recovery process, collected waste liquor in the waste liquor intermediate pond is subjected to alkali recovery treatment. Before the alkali recovery treatment, the method also comprises the following evaporation pretreatment steps of: (a) performing pressure filtering on waste liquor, namely filtering the waste liquor in the waste liquor intermediate pond by a pressure sieve, discharging dregs formed during filtering to a dreg sieving pond, and discharging the filtered waste liquor to a waste liquor tower to enter the step (b); and (b) performing evaporation grading treatment on the filtered waste liquor by an evaporator, wherein heavily-polluted concentrated solution is discharged to a concentrated solution pond for alkali recovery treatment, mildly-polluted concentrated solution is discharged to a wood chip washing water tank to clean wood chips, and after being mixed with disk mill dilution water in a white water tower, white water generated during evaporation is discharged to a hot white water tank and enters a pulping system of the alkaline peroxide mechanical pulp. The evaporation pretreatment process method has the advantages of high alkali recovery efficiency and environment friendliness.

In some embodiments, a method may include treating pulp. The method may include contacting a wood pulp with a singlet oxygen source. The method may include contacting the wood pulp with an alkaline peroxide source. The singlet oxygen source may include a peracetate oxidant solution and generating a reactive oxygen species. The peracetate oxidant solution may include peracetate anions and a peracid. In some embodiments, the peracetate solution may include a pH from about pH 10 to about pH 12. In some embodiments, the peracetate solution has a molar ratio of peracetate anions to peracid ranging from about 60:1 to about 6000:1. In some embodiments, the peracetate solution has a molar ratio of peracetate to hydrogen peroxide of greater than about 16:1. The peracetate oxidant solution may provide enhanced treatment methods of bleaching, brightening, and delignifying pulp fibers involving the use of peracetate oxidant solutions.

A novel method for the production of light-stable and process-stable lignocellulosic materials, in particular, the production of mechanical wood pulps with much improved light and process stability is described, as well as the resulting pulps of improved light and process stability and papers containing such pulps. The novel method involves the reaction of lignocellulosic materials such as bleached chemithermomechanical pulps (BCTMP) with (a) a water-soluble, fibre-reactive yellowing inhibitor possessing two or more secondary amino or ammonium (—NHR′ or —HN⁺HR′), tertiary amino or ammonium (—NR′R″ or —HN⁺R′R″), and/or quaternary ammonium (—N⁺R′R″R′″) functional groups in an aqueous medium, or (b) a water-soluble, fibre-reactive hindered amine light stabilizer possessing said amino or ammonium functional groups in an alkaline peroxide bleaching medium or in an aqueous medium with a subsequent bleaching of the materials in an alkaline peroxide bleaching medium. Examples of the water-soluble, fibre-reactive yellowing inhibitors are the novel, N-(2,2,6,6-tetramethyl-1-oxyl-piperidin-4-yl)-N′-{2-[2-(2,2,6,6-tetramethyl-1-oxyl-piperidin-4-ylamino)-ethylamino]-ethyl}-ethane-1,2-diamine (abbreviated as TETA-2TEMPO) and its hydroxylamine hydrochloride derivative, N-(2,2,6,6-tetramethyl-1-hydroxyl-piperidin-4-yl)-N′-{2-[2-(2,2,6,6-tetramethyl-1-hydroxyl-piperidin-4-ylamino)-ethylamino]-ethyl}-ethane-1,2-diamine hexahydrochloride (abbreviated as TETA-2TEMPOH-6HCl).

The invention discloses a preparation method of a coconut-shell cellulose modified acrylate pressure-sensitive adhesive, belonging to the technical field of the preparation of the pressure-sensitive adhesive. The preparation method comprises the following steps: by taking coconut shells as a raw material, extracting coconut-shell cellulose by virtue of alkaline peroxide, utilizing the coconut-shell cellulose as a cross-linking agent to modify acrylate pre-emulsion in a cross-linking manner, thus obtaining modified emulsion, smearing the modified emulsion on a base material, and drying to obtain the pressure-sensitive adhesive. The acrylate emulsion is cross-linked and modified by utilizing the characteristics of the coconut-shell cellulose such as middle holes, longitudinal valleys, transverse branches, good flexibility, good air permeability and good wear resistance to add a cross-linking netted structure of the acrylate pressure-sensitive adhesive, and linear molecules are chemically bonded, so that the stripping strength, primary adhesive force and lasting adhesive force of the pressure-sensitive adhesive are improved, the drying time is shortened, the defects of a traditional single-component acrylate pressure-sensitive adhesive are overcome, and the application prospect is wide.