WO2003031348A2 - Procede de recuperation et de recyclage de composes contenus dans des effluents provenant de procedes de delignification et de blanchiment dans des usines de pate a papier - Google Patents

Procede de recuperation et de recyclage de composes contenus dans des effluents provenant de procedes de delignification et de blanchiment dans des usines de pate a papier Download PDF

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Publication number
WO2003031348A2
WO2003031348A2 PCT/IT2002/000652 IT0200652W WO03031348A2 WO 2003031348 A2 WO2003031348 A2 WO 2003031348A2 IT 0200652 W IT0200652 W IT 0200652W WO 03031348 A2 WO03031348 A2 WO 03031348A2
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WO
WIPO (PCT)
Prior art keywords
process according
delignification
liquor
organic
water
Prior art date
Application number
PCT/IT2002/000652
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English (en)
Other versions
WO2003031348A3 (fr
Inventor
Franco Nardi
Original Assignee
Anaox Technologies S.A.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anaox Technologies S.A.R.L. filed Critical Anaox Technologies S.A.R.L.
Priority to EA200400532A priority Critical patent/EA200400532A1/ru
Priority to JP2003534338A priority patent/JP2005504899A/ja
Priority to EP20020785913 priority patent/EP1456135A2/fr
Publication of WO2003031348A2 publication Critical patent/WO2003031348A2/fr
Publication of WO2003031348A3 publication Critical patent/WO2003031348A3/fr

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Classifications

    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/12—Combustion of pulp liquors
    • D21C11/14—Wet combustion ; Treatment of pulp liquors without previous evaporation, by oxidation of the liquors remaining at least partially in the liquid phase, e.g. by application or pressure
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M43/00—Combinations of bioreactors or fermenters with other apparatus
    • C12M43/08—Bioreactors or fermenters combined with devices or plants for production of electricity
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
    • C12M47/10—Separation or concentration of fermentation products
    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/025—Thermal hydrolysis
    • 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
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/286—Anaerobic digestion processes including two or more steps
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/59—Biological synthesis; Biological purification
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • This invention relates to a novel method for the recover and recycle of the substances, energy, chemicals and water from the effluents of delignification and bleaching processes in a pulp mill.
  • the invention relates to a novel method for organizing in a sequence biological, chemical and physical processes which are in part known in the art.
  • the invention will be named hereafter as Anaox process which is a short form for "ANAEROBIC and wet “OXIDATION" the two main technologies on which the present invention is based.
  • the invention intends to provide the pulp and paper industry with a novel method for the setup of a pulp mill of a small and medium capacity in order to process economically and with an environmental acceptable impact fast growing cellulosic materials which are required to support the fast growing demand of paper in the whole area lacking of forest and trees plantations.
  • the pulping technology to separate the cellulose from other organic compounds makes use of an association of chemicals which most frequently is formed by NaOH + Na 2 S which characterizes the kraft process. Sulphite and disulphite characterizing the acid process are used in a minor degree.
  • the soda process For open structured raw material like straw and annual fiber the soda process, associated with anthraquinone or with 0 2 as in the most advanced technologies, is used.
  • the kraft and soda process produce pulp which requires long bleaching sequences based, in the past, on chlorine and chlorine compounds which, because of the high toxicity of the resulting organic chlorinated material have been substituted by 0 2 , 0 3 and H 2 O 2 in a multistage treatment.
  • the NaOH + O 2 process according to the present invention which is used for the open structured materials as agricultural residues and annual fiber, produces easily bleachable pulps using chlorine free sequences.
  • the delignification process should be completed by a weak black liquor (W.B.L.) recovery which should adapt to the peculiarities of a low heat value and high content of NPE frequently containing high percentage of SiO 2 and Cl " .
  • W.B.L. weak black liquor
  • One of the objects of the present invention is to provide a recovery and recycling process for chemicals, energy and water from the W.B.L. and bleaching effluent of a NaOH + O 2 chlorine free process, in order to install profitable and environmental acceptable mills also of small and medium capacities for pulping agricultural residues, annual fiber and fast growing cellulosic materials.
  • a second object of the present invention is to minimize the pollution caused by the kappa reduction and bleaching sequence of the standard size wood based mills, minimizing the difficulties in water recycling which relate to the presence of organic salts (oxalate, acetate, etc.).
  • a further object of the present invention is to facilitate the effluent treatment and water recycling in the high yield pulping processes (TMP, CTMP, semi-chemical and secondary fiber pulp) in which the organic materials in the effluent are present in a low concentration which cannot justify investment in conventional recovery.
  • the process according to the present invention is characterized in that it comprises the steps of: a) causing the black liquor resulting from a delignification process to undergo one or more anaerobic treatments in order to produce biogas from the organic substance to be used as an energy source and to convert, by such methanation, the sodium salts of the organic acids into Na 2 CO 3 , b) evaporating the liquor resulting from the anaerobic treatment in order to recover water condensate and concentrate the liquor, c) causing the concentrated black liquor to undergo an oxidation treatment in order to destroy the organic compounds with CO 2 production and recover chemicals, heat and water, d) recovering the alkaline sodium salts by means of different solubility, e) causing the separated alkalis to undergo a decarbonation in order to transform them in carbonates; and f) recausticizing part of carbonates in sodium hydroxide, a reactant contained in the liquor of the delignification.
  • the concentrated effluent from the evaporation of the water recovery system from the kappa reduction and bleaching stage is added to the W.B.L. of the delignification step.
  • the biogas from the anaerobic treatment is conveyed to the power generation plant to cover the process power requirement.
  • the condensate from step b) of the process - clean water - is recycled to the process.
  • Further features of the present invention are the following: i) the CO 2 developed in the wet oxidation step and in the decarbonation step is recycled to adjust, specifically lower, the pH of the W.B.L. to the anaerobic treatment and the water recovered from the wet oxidation is recycled to the pulping line, ii) the NaOH from recausticizing, in the ratio required by the process, is recycled to the delignification step.
  • Fig. 1 The invention in its complete structure is shown in the block diagram of Fig. 1 which is divided in sections from 1/a to 1/e; each section relating to the single process and treatment steps, their interconnection and their sequence in the process.
  • Section 1/a shows the pre-treatment and delignification step which in different form are part of any conventional pulping process.
  • the non cellulosic components of the raw material lignin, hemicellulose, inorganic components
  • yields ratio between pulp and raw material on BD basis
  • the higher yield characterizes pulp like GW, TMP, CTMP mainly used for newsprint production, while the pulps with lower yield are bleached pulp for printing and writing paper, or more sophisticated paper as security banknotes.
  • the lowest yield pulps are classified as "dissolving pulp” which by different physical and chemical processes (acetilation, nitration, viscose) produces chemicals, films and yarns for the textile industry.
  • the non cellulose components in the raw material are dissolved in the W.B.L. which will have different concentration according to the different process conditions and yields. These liquors are normally concentrated in strong black liquor for their consequent processing.
  • an agricultural residue (block 10) is pretreated with water and weak caustic liquor (block 1 1 ) to minimize its SiO 2 and Cf contamination before being delignified (block 12).
  • the alkali/O 2 process the alkali is mainly sodium carbonate recovered and recycled (line L1 ) from the decarbonation step.
  • the loss of chemicals in the recovery cycle is integrated by NaOH make up (line L2).
  • the process is optimised by the choice of a proper ratio NaOH/Na 2 CO 3 to guarantee the OH ion concentration required to catalyse the lignin decomposition.
  • the alkali is the main agent in lignin solubilization, while the O 2 causes the:
  • the modification of the lignin in biodegradable substance is relevant for the total process efficiency. Specifically, the efficiency of the anaerobic treatment of the W.B.L. from the alkali/O 2 delignification and from kappa reduction becomes significantly higher than that obtained processing kraft/soda liquors.
  • the unbleached pulp from the delignification step is separated from the liquor by filtration and washed in a multistep brown stock washing system (block 13) and then transferred (line L3) to the kappa reduction and bleaching step (block 14 and line L14). From the effluents of the bleaching step the water is recovered by evaporation (block 15) and recycled to the process (line L11). In the section 1/b the weak liquor from delignification step (block 16) and the concentrated effluent from the kappa reduction and bleaching step based on 0 2 , O 3 in a mild alkali medium, are fed to the anaerobic step.
  • the energy for the anaerobic micro organisms is supplied by the organic substance degradation in reduced atmosphere free from O 2 .
  • the biogas (prevailing CH + CO 2 ) is produced by the modification of biodegradable liquor components.
  • the W.B.L. from the delignification step which has a high organic content normally evaluated as "chemical oxygen demand" COD, in one of the preferred but not exclusive application of the invention, is mixed (line L4) with the concentrated residues from the evaporation of the kappa reduction and bleaching effluent, having lower COD.
  • the ratio of this mixture is adjusted to obtain COD, temperature and pH of the mixed effluent to guarantee the best efficiency of the anaerobic step.
  • the anaerobic treatment is frequently used as the first step of an effluent treatment because of its capability to transform 60-70% of organic components into biogas with minimum of bio sludges production (line L6).
  • the anaerobic treatment (section 1/b block 19) is of decisive importance in the process according to the present invention because, together with the above mentioned effect, it has the capability to convert, as an additional result of methanation, organic sodium salts (acetate, oxalate, formate, etc.) into inorganic sodium carbonates.
  • Sodium carbonate and sodium hydroxide are the alkali for the solubilization of the non cellulosic components, in combination with 0 2 in the most advanced technologies.
  • the degradation, due to the O 2 , of part of the lignin present in the black liquor in biodegradable compound is essential for optimising the efficiency of the methanation (COD reduction) in the anaerobic step which may reach 80 ⁇ 85% compared to 60 ⁇ 70% characterizing the treatment of the liquor (from soda and kraft process) in which the lignin is not partially degraded.
  • the biogas production (energy recovery) is also improved, since it is proportional to the COD reduction. About 400 Nmc of biogas are originated from each ton of destroyed
  • the high efficiency in anaerobic treatment which characterizes the invention, can be seen in that the heat recovery in biogas is characterized by a content of 65 ⁇ 70% of methane.
  • the biogas is converted into electric power (line L7) by a special diesel generator designed for this type of gas (block 20).
  • the section 1/c relates to the evaporation (block 21) of the weak liquor with reduced ODS after the anaerobic step (block 19) in order to enter the proceeding wet oxidation process (section 1/d).
  • a weak black liquor from the delignification (block 12) with 10% TDS will be reduced to 8% TDS by mixing with the concentrated effluent from the kappa reduction and bleaching step (block 14) in a ratio of
  • the anaerobic treatment transforming in biogas the 85% of the organic substance, will reduce the 4% ODS of the incoming W.B.L. to 0,6% ODS in the liquor after the anaerobic step.
  • the evaporation step (block 21) of the liquor with the 0,6% ODS content is intended to increase the ODS% to the minimum organic content 2,5 ⁇ 3% for self supporting the oxidative reaction.
  • the low concentration level of the liquor in the described process will guarantee a condensate from the evaporation step with a negligible contamination by organic substances, much lower than that of the condensate of the conventional recovery process which requires a liquor concentration up to 60 ⁇ 65%.
  • the section 1/d relates to the wet oxidation step (block 22).
  • the liquor at 12 ⁇ 15% TDS is fed to the reactor together with the oxygen in a ratio 1 :1 to the liquor COD. Up to 99,5% of the incoming organic substances is oxidised (burnt) in this process step.
  • the heat from the oxidative reaction is in excess over the demand for the liquor preheating and for reaching and maintaining the process temperature at 320°C.
  • the mentioned excess of heat is used to produce steam at a pressure of 10 bar and recycled to the process (line L9).
  • the reduction (80 ⁇ 85%) of the COD in the W.B.L. by the anaerobic treatment reduces the O 2 required by the wet oxidation to only 15 ⁇ 20% of the O 2 consumption to oxidize the total ODS of the W.B.L. from the delignification step.
  • the O 2 required for the delignification step (block 12), for the kappa reduction and bleaching step (block 14) and for wet oxidation step of the recovery system (block 22) can be economically produced in the pulp mill by means of the molecular sieve technology. It should be emphasized that a pulp mill based on alkali/O 2 delignification may depend for its chemicals from the external sources only for the alkali make-up.
  • the salts due to the conversion operated by the anaerobic treatment, will be substantially sodium bicarbonates which may be contaminated by a low percentage of NPE mainly sodium chloride (Cl ⁇ ) and silica (SiO 2 ) present in many of the agricultural residues. Most of the contaminants are washed out in the wet pretreatment system which is normally included in the design of a new mill. In the case of wheat straw, the amount of 6 ⁇ 10 g of Cl " and 4 ⁇ 6 g of Si0 2 per kg BD of straw will be respectively reduced by 90% and 50 ⁇ 60% in the wet pretreatment.
  • the residual quantity will be present in the weak black liquor from delignification and will be transferred in the bicarbonate/carbonate recovered solution. Their building up over the amount which can be tolerated by the process can only be controlled by taking care of their excess.
  • the sodium salts (block 22) can be recycled as sodium carbonate (line L1), after the separation from the contaminants (block 23). Its recausticizing (block 25) may be limited to the only quantity which should be recycled (line L2) as hydroxide for kappa reduction and bleaching step (block 14) .
  • the mills of limited capacities can be more easily positioned on the territory facilitating the harvesting collection and transport of the agricultural residues and annual plant characterised by low bulk weight;

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Biotechnology (AREA)
  • Genetics & Genomics (AREA)
  • Biomedical Technology (AREA)
  • Microbiology (AREA)
  • Sustainable Development (AREA)
  • Biochemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Paper (AREA)
  • Removal Of Specific Substances (AREA)
  • Processing Of Solid Wastes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)

Abstract

L'invention concerne un procédé consistant: a) à soumettre la liqueur noire provenant d'un procédé de délignification à au moins un traitement anaérobique afin de produire un biogaz à partir de la substance organique utilisée comme source d'énergie et à convertir par méthanisation les sels de sodium provenant d'acides organiques en Na2CO3; b) à faire évaporer la liqueur résultant dudit traitement anaérobique afin de récupérer un condensat d'eau et à concentrer cette liqueur; c) à soumettre la liqueur noire concentrée à un traitement d'oxydation afin de détruire les composé organiques tout en produisant du CO2, et à récupérer les produits chimiques, la chaleur et l'eau; d) à récupérer les sels de sodium alcalins à l'aide de différentes solubilités; e) à soumettre les alcalis séparés à une décarbonisation afin de les transformer en carbonates; et f) à caustifier une partie des carbonates en hydroxyde de sodium, un réactif contenu dans la liqueur de délignification.
PCT/IT2002/000652 2001-10-12 2002-10-11 Procede de recuperation et de recyclage de composes contenus dans des effluents provenant de procedes de delignification et de blanchiment dans des usines de pate a papier WO2003031348A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EA200400532A EA200400532A1 (ru) 2001-10-12 2002-10-11 Процесс восстановления и рециркуляции соединений, содержащихся в промышленных отходах процессов обесцвечивания и делигнификации на целлюлозных заводах
JP2003534338A JP2005504899A (ja) 2001-10-12 2002-10-11 パルプ工場における脱リグニン工程および漂白工程の廃液に含まれている化合物を回収し、再循環させるための方法
EP20020785913 EP1456135A2 (fr) 2001-10-12 2002-10-11 Procede de recuperation et de recyclage de composes contenus dans des effluents provenant de procedes de delignification et de blanchiment dans des usines de pate a papier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2001A002119 2001-10-12
IT2001MI002119A ITMI20012119A1 (it) 2001-10-12 2001-10-12 Procedimento di recupero e rimessa in ciclo dei composti contenuti negli effluenti dei processi di deglignificazione e imbianchimento di imp

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Publication Number Publication Date
WO2003031348A2 true WO2003031348A2 (fr) 2003-04-17
WO2003031348A3 WO2003031348A3 (fr) 2003-10-02

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EP (1) EP1456135A2 (fr)
JP (1) JP2005504899A (fr)
EA (1) EA200400532A1 (fr)
IT (1) ITMI20012119A1 (fr)
WO (1) WO2003031348A2 (fr)

Cited By (8)

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WO2007076943A2 (fr) * 2005-12-21 2007-07-12 Meri Entsorgungstechnik für die Papierindustrie GmbH Installation et procede de traitement d'eau de fabrication
WO2012117161A1 (fr) 2011-02-28 2012-09-07 Aalto University Foundation Procédé de récupération de produits chimiques
WO2012136505A3 (fr) * 2011-04-06 2013-01-24 Yara International Asa Procédé de traitement d'eaux usées industrielles
US8715969B2 (en) 2008-11-20 2014-05-06 E I Du Pont De Nemours And Company Delignification of biomass with sequential base treatment
WO2014185957A1 (fr) 2013-05-14 2014-11-20 Ciris Energy, Inc. Traitement de matières premières carbonées
CN104445606A (zh) * 2014-12-03 2015-03-25 四川北方硝化棉股份有限公司 减少碱消耗的硝化棉废水处理方法
CN105565619A (zh) * 2016-03-22 2016-05-11 新疆国力源环保科技有限公司 秸秆制浆废水处理系统
CN108349761A (zh) * 2015-11-04 2018-07-31 凯米罗总公司 用于优化化学制浆工艺中的材料回收的方法

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Publication number Priority date Publication date Assignee Title
CN102092804B (zh) * 2009-12-11 2012-08-22 山东太阳纸业股份有限公司 化学机械浆废水零排放处理方法

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EP1097908A1 (fr) * 1999-11-04 2001-05-09 Paques Water Systems B.V. Circuit de purification dans l'industrie de fabrication du papier

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WO2007076943A3 (fr) * 2005-12-21 2007-08-30 Meri Entsorgungstech Papierind Installation et procede de traitement d'eau de fabrication
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US8715969B2 (en) 2008-11-20 2014-05-06 E I Du Pont De Nemours And Company Delignification of biomass with sequential base treatment
WO2012117161A1 (fr) 2011-02-28 2012-09-07 Aalto University Foundation Procédé de récupération de produits chimiques
US9376335B2 (en) 2011-04-06 2016-06-28 Yara International Asa Process to treat industrial wastewater
WO2012136505A3 (fr) * 2011-04-06 2013-01-24 Yara International Asa Procédé de traitement d'eaux usées industrielles
WO2014185957A1 (fr) 2013-05-14 2014-11-20 Ciris Energy, Inc. Traitement de matières premières carbonées
EP2997002A4 (fr) * 2013-05-14 2016-12-14 Ciris Energy Inc Traitement de matières premières carbonées
CN104445606A (zh) * 2014-12-03 2015-03-25 四川北方硝化棉股份有限公司 减少碱消耗的硝化棉废水处理方法
CN108349761A (zh) * 2015-11-04 2018-07-31 凯米罗总公司 用于优化化学制浆工艺中的材料回收的方法
CN105565619A (zh) * 2016-03-22 2016-05-11 新疆国力源环保科技有限公司 秸秆制浆废水处理系统
WO2017161918A1 (fr) * 2016-03-22 2017-09-28 新疆国力源投资有限公司 Système de traitement d'eaux usées de fabrication de pâte de paille

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ITMI20012119A1 (it) 2003-04-12
JP2005504899A (ja) 2005-02-17
EA200400532A1 (ru) 2005-06-30
EP1456135A2 (fr) 2004-09-15

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