US20090114353A1 - Method of Papermaking - Google Patents

Method of Papermaking Download PDF

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Publication number
US20090114353A1
US20090114353A1 US11/922,880 US92288005A US2009114353A1 US 20090114353 A1 US20090114353 A1 US 20090114353A1 US 92288005 A US92288005 A US 92288005A US 2009114353 A1 US2009114353 A1 US 2009114353A1
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Prior art keywords
ppm
papermaking
water
aqueous solution
concentration
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Abandoned
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US11/922,880
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English (en)
Inventor
Tsugio Tachikawa
Hiroshi Tachikawa
Hideo Tachikawa
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Es Technologies Corp
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HSP HANBAI KK
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Filing date
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Assigned to HSP HANBAI KABUSHIKI KAISHA reassignment HSP HANBAI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TACHIKAWA, HIDEO, TACHIKAWA, HIROSHI, TACHIKAWA, TSUGIO
Assigned to ES. TECHNOLOGIES CORP. reassignment ES. TECHNOLOGIES CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HSP HANBAI KABUSHIKI KAISHA
Publication of US20090114353A1 publication Critical patent/US20090114353A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/11—Halides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/29—Chlorine compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the invention relates to a method which could simplify the chemical treatment in the paper making and provide an optimum wet end environment.
  • the slime trouble caused by microorganism also increases immediately and lowering effects of the aluminum sulfate causes the inclusions such as pitch, anion trash, etc to be accumulated inside the system continuously.
  • how to deal with the dirty of the paper making machine has become the hardest problem in raising productivity and operation.
  • the slime trouble caused by microorganism and the inclusions of pitch, anion trash, etc become main reasons of the dirty.
  • the chlorine series inorganic antibacterial agent which will make the reductive material oxidized and decomposed completely, and then use the previous organic antibacterial agent.
  • it will remain a lot of effective chlorine with strong oxidization property, so that the dyestuff added in the product is oxidized to influence the color phase of the paper and still decay the metals material such as pipe used during the white water circulatory system.
  • the new type organic antibacterial agent which is difficult to be influenced by the reductive material, is effective in actual papermaking processes with 5-20 mg/L reductive material, but when there are reductive materials with higher concentration, we need to increase the antibacterial agent with high concentration.
  • a first object of this invention is to provide a method wherein the chlorine series oxidizing agent could optimize the environment of paper making in condition of the acidity.
  • a second object of this invention is to use the same chlorine series oxidizing agent not only in the papermaking processes but also in the bleach processes. Also, with the optimization of the papermaking environment, the possibility of reuse the papermaking drainage also increases. Therefore, a third object of this invention is to deal with the papermaking drainage, so that the processed water can be reused as industrial water.
  • a method of papermaking which comprises subjecting a papermaking raw water to a treatment, adding some necessary chemical treating agents into a white water wherein in place of one or more of the chemical treating agents an aqueous solution containing ions of hypochlorous acid or chlorous acid adjusted to have pH of greater than or equal to 4 and less than 7 is prepared and charged continuously or intermittently into the white water with the expectation that at the time of charging a residual chlorine concentration is kept at the concentration of more than 0.5 ppm, more ideal is more than 1 ppm.
  • the dilution aqueous solution that contains ions of hypochlorous acid or chlorous acid is one containing not only the hypochlorous acid and chlorous acid, but also their sodium or potassium salts in an acidic condition and also bromous acid, hypobromite and their sodium and potassium salt, etc.
  • the sodium hypochlorite aqueous solution having a concentration between 1000 ppm-10000 ppm, preferably 3000 ppm-8000 ppm, at a weak acidity scope of pH of 4-6.5, because they can show a strong disinfect property, a strong organic matter decomposition property, and a strong diselectrification property of anion trash.
  • the purpose of adding a hypochlorous acid solution is not only to control the slime, but also to control the pitch and the anion trash. Therefore, it is preferable to add an aqueous solution containing ions of hypochloric acid or chlorous acid adjusted to have pH 4-7 continuously or intermittently into the white water after papermaking with the expectation that at the time of charging a residual chlorine concentration is kept at the concentration of less than 20 ppm, preferably less than 10 ppm.
  • an aqueous solution contains ions of hypochloric acid or chlorous acid to have a pH 4-7 into the circulating white water with the expectation that at the time of circulating a residual chlorine concentration in the white water is kept at the concentration of less than 5 ppm, preferably 0.1 to 3 ppm, and a residual chlorine concentration out of the white water circulation system is kept at the concentration of less than 1 ppm.
  • the waste water kept at the concentration of more than 10 ppm is re-used for processing water.
  • an aqueous solution containing ions of hypochloric acid or chlorous acid adjusted to have pH of greater than or equal to 4 and less than 7 is charged continuously or intermittently into the white water with the expectation that at the time of bleaching a residual chlorine concentration in the papermaking raw water is kept at the concentration of more than 500 ppm. It can simplify several bleach steps, and it is easy to manage the medicine control. Moreover, preferably it can raise the processing effect in the papermaking mentioned above.
  • the purpose of the bleach process is to simplify several bleach after de-lignin.
  • the inventive bleaching method can be applied to the wastepaper after de-inking and the bleaching process may be applied at the same time of de-inking.
  • the inventive aqueous solution contains ions of hypochloric acid or chlorous acid can be used, in place of them it may contain not only the sodium hypobromite, but also the potassium hypobromite, etc. However, it is preferable to use an aqueous solution containing 1000-20000 ppm, preferably 3000-10000 ppm of sodium hypochlorite and adjusted to a pH of 4-7, preferably to a pH of 4.5-6.5.
  • the bleaching process is preferably carried out at a pulp concentration of 3 to 30 wt. % in the papermaking raw water. When the concentration of the pulp is high, it is recommendable to add the solutions which contain the hypochlorite in many times.
  • the first hypochlorite solution of more than 3000 ppm it is preferable to add the first hypochlorite solution of more than 3000 ppm and the second, the third solution with a lower concentration of hypochlorite. It is our surprising that the solution containing ions of hypochlorous acid can not only show a effective disinfect effect against microorganism within a scope of 4-6.5 of pH, but also shows a same strong bleach effect as ozone or chlorine dioxide.
  • the present invention is also a method of papermaking which comprises subjecting a papermaking raw water to a treatment of de-lignin and de-inking, bleaching a white water, papermaking the white water and then discharging a waste water treated by necessary chemical treating agents, wherein in place of one or more of conventional chemical agents an aqueous solution contains ions of hypochloric acid or chlorous acid adjusted to have pH of greater than or equal to 4 and less than 7 is charged continuously or intermittently into the white water in one or more of the all steps, measuring change of Oxidation-Reduction Potential before and after charging the aqueous solution in the white water and the waste water and finally controlling the charging amount of the aqueous solution automatically according to the measuring signal.
  • a suitable quantity of the solution can be controlled according to this comparing signal.
  • the solution containing ions of hypochloric acid or chlorous acid adjusted to have a pH of weak acid is charged continuously or intermittently. Therefore, by measuring the oxidation-reduction potential and the pH, the control accuracy can be raised. Thus, it is more preferred.
  • the hypochlorous acid can exert the effective microorganism disinfects effects on condition that the pH is 4-6.5 and the concentration of the residual chlorine is more than 0.4 ppm.
  • the concentration of the residual chlorine can exert effect of the slime control.
  • we have to resolve the organic compound and pitch, etc and clean the anion trash so it is more preferred to set the concentration of the residual chlorine at 0.5-1 ppm.
  • the hypochlorous acid solution can not be all consumed in the whitewater pit and will remain in the circulation white water. If remain a little, it will not influence the environment of papermaking. So we can set the concentration of the residual chlorine to less than 20 ppm.
  • the aqueous solution which contains ions of hypochloric acid or chlorous acid in the papermaking process can be instead of the electrolysis aqueous solution that contains ions of hypochloric acid or chlorous acid.
  • the aqueous solution that contains hypochloric acid can be made by the Steri Mixer made in HSP Co. Ltd at the spot.
  • the solution When made at the spot and for input, it is preferred to make the solution having a pH of 4 to 6.5 ppm, and a concentration between 5000 and 20000 ppm, especially between 5000 and 10000 ppm.
  • the pH When made at the other factory, it must be carried with the tank lorry, so it is preferred that the pH is from 5 to 6.5 ppm, the concentration is from 3000 to 8000 ppm.
  • a pH regulator such as the inorganic agent that do not affect the effective chlorine, for example KHCO 3 , carbonic acid hydrogen potassium or NaHCO 3 , carbonic acid hydrogen sodium.
  • the aqueous solution that contains ions of hypochloric acid or chlorous acid which shows a weak acidity and the effective chlorine concentration of 1000 to 20000 ppm, more preferably 3000 to 10000 ppm to the white water of the wet end after the papermaking on condition of acidity.
  • the environment of the wet end of the papermaking can be improved by the present invention.
  • Oxidation of the hypochloric acid water can resolve ester part of the vinyl or acrylic compounds, etc.
  • the dosage of the pitch control agents is reduced by a degree of 20-30%.
  • inventive chlorine series oxidizing agent which is represented by acidic sodium hypochlorite solution to bleach the papermaking raw water after a treatment of de-lignin and de-inking, it can enhance the effect that mentioned above (1) to (6), and simplify the whole papermaking processes of the chemical agent treatment extremely.
  • FIG. 1 is a schematic view of a white water circulation system provided with a hypochlorite water supply system.
  • FIG. 2 is a schematic view showing the specific examples of the control system in the invention.
  • FIG. 3 is a view showing mechanism of the method of papermaking according to the present invention.
  • FIG. 4 is a schematic view of the examples of the system in case of waste paper in the invention.
  • FIG. 5 is an outline view of the overall structure of the best way to deodorize of the paper making equipment in the invention.
  • FIG. 6 is a vertical view of an embodiment of the treatment room according to the present invention.
  • FIG. 7 is a side view of the structure of the treatment room mentioned above.
  • FIG. 1 is the schematic view of the wet end environment control system of the white water circulation in the papermaking process used to a conventional wastepaper raw material.
  • the whitewater after papermaking in the papermaking machine 100 should be sent to the whitewater pit 110 first in which the slime can be treated, then a part of it will be circulated to the stock inlet 150 , the other part will be sent to the drainage pit 120 .
  • the pulp raw materials will be sent to the seed box 140 from the de-inking process pit 160 , and through the screening pit 130 , be sent to the stock inlet 150 , finally arrive at the papermaking machine 100 .
  • a white pit 110 in a papermaking machine 100 but usually there are four papermaking machines in tandem and there are layout of the white water pit 110 ( a ), ( b ), ( c ) and ( d ) on every papermaking machine.
  • the hypochlorous water is supplied continuously for the white water pit (a), (b), (c) and (d).
  • There measurement devices D 1 -D 4 are arranged on all pits which is to measure the concentration of the residual chlorine in the white water, and the measurement signal 80 is feedback to the water supply system of the hypochlorous water, and the supply is adjusted.
  • the measurement device is made up of an oxidation-reduction potential meter, but it is preferred to use the meter with a pH meter.
  • the hypochlorous water supply system 200 can be made. Namely, from the solution tank 1 with sodium hypochlorite or sodium chlorite and diluted hydrochloric acid tank 2 , through a constant rate pump 3 and 4 , the aqueous solution of the diluted hydrochloric acid and sodium hypochlorite are sent to the mixer 5 and 6 . In addition, industrial water is supplied to the mixer 5 and 6 from the other channels. Here, the aqueous solution of the diluted hydrochloric acid and sodium hypochlorite is mixed with the industrial water to be diluted. So that, the pH is adjusted to 4-6.5 and the concentration is adjusted to 1000-10000 ppm, more preferably 3000-8000 ppm.
  • the aqueous solution of the dilute sodium hypochlorite is adjusted in the mixer 5 and 6 and supplied by the pipe of the whitewater pit 110 or the chest discharge pit that connect to the water end.
  • a generated water header At this pipe, there is provided a generated water header, and a control valve at the generated water header.
  • the generated water header is used to adjust the quantity of the aqueous solution of the dilution sodium hypochlorite to be charged in the whitewater pit of water end or the chest discharge pit.
  • the 10 is a power control panel, it controls the quantity of the water, the hypochlorous acid soda, the chlorite soda and the dilute hydrochloric acid that is supplied to the mixer, and it also control the control valve of the pipe 9 so that to control the quantity of the hypochlorous acid that supplied to the whitewater pit 110 , drainage pit 120 .
  • 7 is the hypochlorous acid auxiliary tank
  • 8 is the dilute hydrochlorous acid auxiliary tank.
  • a measuring device which is used to measure the concentration of the residual chlorine in whitewater is attached to the whitewater pit or chest drainage pit, send this measuring signal to the power control panel 10 , so that the input is used to adjust the amount of dilute aqueous solution of the dilute sodium hypochlorite or chlorite to be charged in the whitewater pit of water end or the chest discharge pit.
  • concentration of the residual chlorine it is preferred to control the concentration of the residual chlorine at a range of 0.1-3 ppm at most 5 ppm in whitewater circulation system, on the other hand it is preferred to control the concentration of the residual chlorine under 1 ppm out of the whitewater circulation system.
  • the aqueous solution containing sodium hypochlorite of 6000 ppm with hydrochlorous acid is prepared at the spot and used.
  • a high concentration aqueous solution of 3000 to 10000 ppm has a good nature of storage, so it can be stored in the tank and be used.
  • the kind of the waste paper to be used the waste paper that recovered from the office (the first-class and middle-waste are mixed together), will be bleached as following before papermaking:
  • Residual ink quantity By using a microscope (10 times) and image analysis device (LA-525 made by Piaz Company), the area of ink at the scope of a certain vision is indicated by ratio (%).
  • An office waste paper is put into the pulper and dissociated therein.
  • the condition of the pulper is 4.5% of pulp concentration, the temperature is 26° C. and NaOH is 1.0%.
  • the waste paper pulp is dehydrated by the screw press until the pulp concentration reaches 18%, and the pulp of the waste paper is kept in an aging tower for 12 hours.
  • After dehydrated until reach 31% by the screw press add the aqueous solution which contains sodium hypochlorite of 3000 ppm at pH of 5.
  • the condition of the bleach tower is the concentration of the pulp of 29%, temperature of 36° C. and the bleaching time is 10 hours. Then, dilute the concentration of the pulp to 3.5% and extract the pulp from the bleach tower and clean in the extractor. After dehydrated until reach 31% by the screw press, add the aqueous solution which contains the hypochlorite acid soda and the pH is 5, 3000 ppm, then kneading in the shredder, and make it stay in the bleach tower. The condition of the bleach tower is kept at the pulp concentration of 28%, the temperature of 40° C., the bleaching time of 10 hours. Then, dilute to 3.5% after bleach, extract from the bleach tower and sent it to the machine chest after adjusting the pH. Then, dedust it by the cleaner after adjusting the concentration of the pulp, then carrying out the same papermaking process as the Example 1.
  • Example 2 a pulp material water is subjected to a series of processes such as alkali processing, dehydrating, aging, dust-removing, cleaning and dehydrating and reaches to the concentration of the pulp to 15%. Then, the pulp water is mixed the sodium hypochlorite by a medicine mixer, and then is subjected to a process of cleaning. The results are shown in Table 1.
  • the method in the invention compared with the method of the bleach of the hypochlorite at the condition of alkaline after alkali processing, can give it more whiteness.
  • FIG. 4 is a flow chart of waste paper recycled paper. Put the 3000 ppm solution of sodium hypochlorite at pH of 5-6 into the whitewater pit, scum pit and pulp pit, considering the water quantity therein. And adjust it to make the whitewater pit, the scum pit to be 20-30 ppm and the pulp pit to be 10-5 ppm.
  • 301 is a hydrochloric acid tank, equipped with the 10% dilute hydrochloric acid.
  • 302 is a tank of solution of sodium hypochlorite, equipped with the 10% aqueous solution. Send the dilute hydrochloric acid and the sodium hydrochlorite aqueous solution to the reserve tank 307 , 308 of the first and the second high concentration (3000 ppm) of sodium hypochlorite generator 305 , 306 (the Steri Mixer made by HSP company) by pump 303 , 304 .
  • first and second Steri mixer 305 , 306 dilute the aqueous solution of the dilute hydrochloric acid and the aqueous solution of sodium hypochlorite with a river water to produce the 3000 ppm aqueous solution of sodium hypochlorite at pH of 5-6.
  • This aqueous solution of sodium hypochlorite is sent to the pulp pit 310 first by the pump 309 and then to the pulper containing the wastepaper and water. Considering the water 20 quantity and bactericidal effects therein, adjust the concentration to 10-1 ppm. However, it is preferred to start with the high concentration at the beginning.
  • the pulp sent the pulp to the chest tank 311 and 311 and put the pulp into the papermaking machine 312 from the white pit 313 .
  • the white pit is circular, considering the water quantity and bactericidal effects, put the 3000 ppm aqueous solution of hypochlorous acid soda into the white pit, and adjust it to 100-10 ppm, especially 30-20 ppm.
  • the chest discharge pit 314 it is preferred to do the same disinfection and deodorization as the pulp pit 1 .
  • the drainage that comes from the chest tank 311 and papermaking machine 312 is recovery at the chest discharge pit 314 and treated at the drainage treatment pit 315 .
  • Recycle scum go by the sludge pit 318 by the sludge sent back device 317 .
  • FIG. 5-FIG . 7 are schematic views showing best methods for deodorant the papermaking equipment.
  • the sodium hypochlorite solution and the dilute hydrochloric acid in 410 , 411 which are sent to the auxiliary tank 421 , 422 that in manufacture device 420 , which made high concentration sodium hypochlorite solution through pipelines 414 , 415 and pumps 412 , 413 .
  • pipelines 423 , 424 extending from the auxiliary tank 421 , 422 and the pipeline 423 , 424 are connected into the generator 425 .
  • the generator 425 mix 9% solution of diluted hydrochloric acid with 12% solution of the sodium hypochlorite.
  • a water pipeline 429 to the generator 425 .
  • a filter 4210 and a pressure reducing valve 4211 in the middle part of the water pipeline 429 .
  • the water that filtrated the inclusions by filter 4210 and reduced to 0.25 Mpa by the pressure reducing valve 4211 is supplied to the generator 425 .
  • the generator 425 in this example there can be made 2000 L of acidic high concentration sodium hypochlorite solution having the concentration of the available chlorine of 6000 ppm and pH of 5-6 per every hour.
  • the high concentration sodium hypochlorite solution is stored in the reserve tank 427 and sent to the scrubber 430 by the send pump 428 .
  • the solution is sprayed to be the droplet with the average particle size in scope of 10 ⁇ m-70 ⁇ m by the vibration of ultrasonic and sent to the many spit exit 432 in the treatment room 440 (dealing space) by the blower 431 .
  • the photocatalyst deodorant device 443 there is a photocatalyst deodorant device 443 .
  • a vector such as the wire mesh bearing the photocatalyst.
  • a ultraviolet lights no icon.
  • the dilute hydrochloric acid and sodium hypochlorite solution is sent to the generator 425 , and are mixed, and at the same time, sent the water without inclusions to the generator 425 to dilute and make 2000 L per hour of high concentration sodium hypochlorite aqueous solution with hydrochloride acidity having available chlorine concentration (6000 ppm) and the pH of 5-6.
  • the high concentration sodium hypochlorite aqueous solution is sent to the scrubbers 430 , through the ultrasonic vibration, the droplet with the average particle size in scope of 10 ⁇ m-70 ⁇ m is sprayed.
  • the droplet with high concentration sodium hypochlorite solution is sent to the many spit exit 432 of the treatment room 440 by blower 431 , then to be sent to the treatment room 440 .
  • this invention is effective in the papermaking not only a used wastepaper, but also for the virgin pulp.
  • this invention because the bacteria number, pitch and organic compounds species are different from the wastepaper pulp, it is preferred to adjust the concentration of the acidic sodium hypochlorite aqueous solution considering the status of the spot.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
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US11/922,880 2005-06-22 2005-12-14 Method of Papermaking Abandoned US20090114353A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2005-181533 2005-06-22
JP2005181533 2005-06-22
PCT/JP2005/022941 WO2006137183A1 (ja) 2005-06-22 2005-12-14 製紙方法

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JP (1) JP5231804B2 (ja)
CN (1) CN101208477A (ja)
WO (1) WO2006137183A1 (ja)

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