Some of the problems/disadvantages of the currently used vacuum filters are: Pressurised disc filters are often used during the production of white liquor in association with the white liquor separation, as white liquor filters to separate the lime mud from the white liquor. Optoelectronic and solar cell applications of Janus monolayers and their van der Waals heterostructures. ISBN 91 - It can be mentioned for the sake of comparison that medium-consistency pulp is so compact that it is just about possible to walk on this pulp, when it is at the upper part of the consistency range. 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 . If one of these conditioning steps (such as the dilution screw) becomes unnecessary, the building height can be reduced, which In turn gives a saving. KARLSTAD Västra Torggatan 10 652 25 Karlstad 054-21 95 80. 1 shows a typical treatment step for the pulp in a reactor with a subsequent washing press according to the prior art; FIG. The drum or the discs rotate continuously in such a manner that parts of the drum or disc surface will temporarily be wetted by the lime mud in the trough. EN. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). The term “dewatered lime mud” is here used to denote lime mud that has been dewatered from filtrate by the filter and that contains only “pure” lime mud, intended for direct or indirect transport to a lime mud kiln. The oxidation of sulphide consumes oxygen, and oxygen gas must for this reason be supplied to the gas circulation system. Now buntes ei grepolis show me, back political map of india solving second order, than differential equations khan, but academy rftx-1 psp 1004 firmware 6.60 physioex 9.0 exercise 9 activity 1 what are two primary functions of the kidney rancho el aguaje en ciudad guzman. MALMÖ Hansacompagniet Malmborgsgatan 6 211 38 Malmö 040-611 34 14. The dilution otherwise functions in the same manner as in the embodiment shown in FIG. a compressor drawing on a suction side thereof a gas phase from the filtrate tank, and a pressurized side of the compressor pressurizing, via the gas circulation system, a lime mud side of the pressurized filter. A simple pipe conduit can be sufficient. The redilution thus preferably takes place in association with adjustment of the pH, which after an alkaline wash normally involves the addition of powerful acidifiers, or the addition of acidic return water/filtrate from subsequent process steps, before the subsequent acidic treatment step. A redilution has been used also in this case after the dewatering screw, with the addition of dilution fluid during intensive agitation from a dilution screw. Considered the most used car wash chemical, high pH presoaks are comprised of alkaline builders and surface active agents (surfactants). 3. having a pulp consistency between 5-25%. An alkaline solution is a mixture of base solids dissolved in water. In the enclosed diagrams, which are based on some 100 experiments using QP bleaching, with different charges being used and consumption and kappa number, inter alia, being measured, it has been possible to establish, firstly, that nearly all the delignification is achieved with a peroxide consumption of less than 10 kilo, and that a consumption of less than 5 kilo was already sufficient to achieve a major part of the delignification. The amount of obliqueness in the mounting is appropriately 45±15° relative to the vertical. 67 were here. It is thus evident that the high charges of peroxide only give rise to an increase in brightness and not to any further delignification. Any other type of dewatering press or washing press, however, having a drum or drums, may be used, in which a consistency of 20-30% or higher is achieved, for example a washing press with a single dewatering drum and an opposing roller, or other types of washing press with two dewatering drums. Impact of dissolved organic matter in hydrogen peroxide reinforced alkaline extraction stages Wilke, Caroline Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013). This appears to lead to the emergence of negative organizational behavior patterns that impose high levels of demands on employees. In addition to this, it is also the case that the diffuser functions extremely well at high temperatures and takes up a minimal amount of space. A pressure filter has the further advantage over a vacuum filter that the pressure difference across the filter is not limited to atmospheric pressure. 1. This is brought about by heating to full cooking temperature in the hi-heat circulation and by adding alkaline cooking liquid to this same circulation. A sufficient amount of oxygen is in this way supplied such that the oxidation of the sulphide in the lime mud can take place. The process according to the invention is first and foremost intended for pulp of average consistency, i.e. The amount of recirculated gas phase that is exchanged in the gas circulation system lies within the interval 5%-20%, preferably less than 10% of the total amount of gas phase in the gas circulation system, and it is regulated by the setting of the regulator valves, The lime mud that attaches to the outer surface (the lime mud side) of the discs is subsequently scraped off by scrapers. The washing press may be preferably equivalent to that revealed by the patent U.S. Pat. 2, which shows a diagram of the relationship between kappa reduction and the peroxide consumption for hard wood pulp, from which it can be seen that approximately a good 60% of the kappa reduction was brought about with a consumption of 5 kilo/BDTM, that more than 90% of the kappa reduction was obtained with a consumption of 10 kilo/BDTM, and that no further real kappa reduction is produced by peroxide consumptions exceeding 15 kilo/BDTM. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) You can still create an account using one of our 3rd party sign-in options. Career. The amount of dilution fluid that is required in order to establish the consistency at which the pulp is subsequently pumped is constituted to more than 75-90% of the fluid that is added at the said nozzles arranged above the level/surface that has been established in the stand pipe. 0.18 bar (a)), a significantly higher temperature can be established during filtration, typically 85° C. for the pressurised filtration and 55° C. in the vacuum filter, without significant loss of energy, and this give a better oxidation, filtration and the possibility of an increased capacity. The dewatered web of pulp, which has a consistency of 20-30% or greater, is fed in this case in to the shredder screw 8 in the same way as shown in FIGS. The proposed bleaching sequence is QP (ZQ) (PO). Translate texts with the world's best machine translation technology, developed by the creators of Linguee. Professional unified design system, high productivity stress-free environment and native 3D PCB editor. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). It is usual that the filter has also a spray wash that sprays the cake. But the dilution is to take place principally through the hydrodynamic mixing effect from the addition of the dilution fluid into the flow of granulate. Account & Lists Returns & Orders. CHANGE OF NAME;ASSIGNOR:KVAERNER PULPING AKTIEBOLAG;REEL/FRAME:019471/0217, Owner name: The dilution fluid is added by a pump to a distribution chamber 60 that is arranged concentrically around the stand pipe 22. A comparison of cold and hot caustic extraction of a spruce dissolving sulfite pulp prior to final bleaching the lignin of the wood is efficiently released without the cellulose being attacked to any appreciable extent. It is understood that such treatment also has been incorporated into the LignoBoost and SLRP systems. The use of chlorine dioxide is also being called into question. KVAERNER PULPING AKTIEBOLAG, SWEDEN, Free format text: Simple vacuum filters with dewatering drums that are partially (typically 20%-40% of the drum) immersed in the pulp suspension that is to be dewatered were used in certain older types of washing step after a bleaching step or a delignification step. It is preferable that the control of the air exchange is regulated such that the minimal partial pressure of oxygen gas of 0.15 bar is established. The cooking and the oxygen delignification can thereby be pursued down to very low kappa numbers without impairing the properties of the pulp, ensuring that bleaching with chemicals of the peroxide type and the like can be used for bleaching up to full brightness while retaining acceptable pulp properties. (Recommended dose: 15-30ml/kg) 4. which after an alkaline wash normally involves the addition of powerful acidifiers, or the addition of . The amount of oxygen gas in dry recirculated gas must then be 0.18/1.42*100=12.6 volume percent. Karlstad, Sverige . The plate was then washed 8 times with wash buffer (150 mM NaCl, 20 mM Tris, pH 7.4, 0.15% Tween 20) using a Multiscreen vacuum manifold (MultiScreen HTS, Vacuum Manifold, Millipore). A practical upper limit lies at 35-40%, where a higher degree of dryness cannot be achieved without affecting the strength properties of the fibres negatively. The very high consistency of the pulp after the dewatering press or the dewatering screw has given rise to the belief that dilution to a homogenous medium consistency cannot be achieved unless dilution occurs under the influence of intensive agitation from the dilution screw. The technique used here is a lower degree of dewatering followed by slurry formation with a cleaner filtrate, and this takes place in a series of vacuum filters in order to achieve the required washing effect. KVAERNER PULPING TECHNOLOGIES, AB, SWEDEN, Free format text: NASA Ames Research Center, Moffett Field, CA. The drum or the discs in the vacuum filter are covered with a filter membrane, normally made of polypropylene, and connected to a vacuum system that creates a suction pressure across the filter membrane. Oral health and healthy aging. FIG. Under these circumstances, the pulp yellows when heated or when irradiated with sunlight. With a stand pipe 22 having a diameter of 800-1,500 mm, it is appropriate that 10-40 nozzles are arranged around the periphery of the stand pipe. 2014a). Alkaline Degreaser; Tar Remover; Iron Oxide Removers; Wheel Cleaners; Bug & Insect Removers; Water Spot / Mineral -Removers; Tar & Adhesive Removers; Shampoo; Accessories; Wash & Drying Equipment. The term “lime slurry” is here used to denote a slurry of lime mud that has not yet been dewatered in the filter and where the lime slurry contains lime mud+filtrate. Increased filtering capacity, while maintaining or reducing the area required. PATENTED CASE, Owner name: Nov 2016 - Present5 years 1 month. Fjärrviksvägen 13 653 50 Karlstad . Apply Detergent in the tray for main-wash. Usually this is marked with "II". Enjoy low prices and great deals on the largest selection of everyday essentials and other products, including fashion, home, beauty, electronics, Alexa Devices, sporting goods, toys, automotive, pets, baby, books, video games, musical instruments, office supplies, and more. The dewatering screw 90 may be another transport arrangement or another distribution arrangement, such as, for example, a distribution screw in the inlet arrangement to a dewatering press. 1-5 show the relationship between kappa number and kappa reduction with peroxide consumption. The shredder screw contains a threaded screw 8a that is driven by a motor 8c, and that may also be equipped with a number of beaters 8b at its outlet, which beaters further whip and break up the shredded pulp. It has also been found that, in existing ozone plants, violent vibrations arise in connection with releasing the pressure on the pressurized pulp. A neutral solution is neither an acid nor alkaline. The demands made by the environmental authorities in certain countries are so severe that it is difficult to comply with them even if only chlorine dioxide is utilized for bleaching. According to a further aspect of the invention, the process is improved by the charge of peroxide in the said first P stage being between 3 and 7 kilo/BDMT, preferably being between 4-6 kilo/BDMT and more preferably about 5 kilo/BDMT. This is taken to denote that the fragmented pulp has a particle size that is normally distributed around a maximum size that is less than 40 mm, preferably less than 30 mm, and even more preferably less than 20 mm. In addition, it is evident that the washing apparatus described can be replaced by similar types of apparatus having a similar function, it being understood that a diffuser mainly functions in accordance with the displacement washing principle and a washing press in accordance with the displacement and thickening principle. Defect and substitution-induced silicene sensor to probe toxic gases. According to a further aspect of the invention, the process is improved by the filtrate from the said second P stage being conveyed to the said first P stage. The term “filtrate side” is here used to denote the side of the filters on which filtrate is present. 2 shows another view of a part of the same process in which the shredder screw 8 is oriented in the same direction as the dilution screw 30. Thus, it is evident that, instead of using ozone, peracids, for example, or an acid P stage can be used in the delignifying acid stage. The invention is based upon the surprising insight that it is not necessary at a raised temperature and with pressurised filters to connect the lime mud side of the filter to the atmosphere in order to obtain the required amount of oxygen for the oxidation of the lime mud. Large temperature losses to the surroundings occur, which means that the oxidation cannot take place at a higher temperature, something that is advantageous for the oxidation reaction. The washing press, In connection with pumping out, a relatively small quantity of peroxide is added to the chute. Somewhat surprisingly, it has been possible to ascertain, in experiments carried out by Kamyr, that delignification with the aid of peroxide can be carried out using very low charges essentially without any loss as regards the strength properties of the fibres, i.e. The term “pressurised filter” is here used to denote both pressurised disc filters and pressurised drum filters. causticizing green liquor, PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL, Filters with filtering elements which move during the filtering operation, Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces, Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft, Treatment of green or white liquors with other means or other compounds than gases, e.g.

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