EP2025807A1 - Procédé de récupération de produits chimiques dans une mise en pâte mécanique - Google Patents

Procédé de récupération de produits chimiques dans une mise en pâte mécanique Download PDF

Info

Publication number
EP2025807A1
EP2025807A1 EP07397025A EP07397025A EP2025807A1 EP 2025807 A1 EP2025807 A1 EP 2025807A1 EP 07397025 A EP07397025 A EP 07397025A EP 07397025 A EP07397025 A EP 07397025A EP 2025807 A1 EP2025807 A1 EP 2025807A1
Authority
EP
European Patent Office
Prior art keywords
sodium carbonate
concentrate
sodium
limestone
mixed
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07397025A
Other languages
German (de)
English (en)
Inventor
Teemu Tanner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rinheat Oy
Original Assignee
Rinheat Oy
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 Rinheat Oy filed Critical Rinheat Oy
Priority to EP07397025A priority Critical patent/EP2025807A1/fr
Priority to US11/889,030 priority patent/US20090025892A1/en
Publication of EP2025807A1 publication Critical patent/EP2025807A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
    • 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
    • D21C11/10—Concentrating spent liquor by evaporation
    • 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
    • D21C11/122—Treatment, e.g. dissolution, of the smelt
    • 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

Definitions

  • This invention relates to a method to recover chemicals in mechanical pulping by evaporating mechanical pulping or recycled fibre plant effluent and burning the received concentrate in a temperature of at least 850 °C under oxidative atmosphere to yield sodium carbonate, the flue gases formed during the combustion are cooled by mixing a colder medium into the flue gases to reach a temperature of 700 to 600°C in order to prevent formed sodium carbonate to stick on surfaces, further cooling of the flue gas and sodium carbonate fume is carried out by converting its heat content into steam, and subsequently sodium carbonate ash is removed from the cooled flue gas flow and dissolved in water for reuse in impregnation prior to refining and/or in peroxide bleaching.
  • Bleaching may require a higher pH than is reached only with a sodium carbonate solution.
  • higher pH solution is generated from a sodium carbonate solution by recausticizing i.e. mixing CaO into the solution or alternatively by electrolytic decomposition of N a2 CO 3 into NaOH and CO 2 .
  • the recausticizing can be complete or partial depending on the pH requirement in peroxide bleaching.
  • calcium carbonate can be fed into the combustion furnace where it is calcined into CaO, or also ferric oxide as iron ore or titanium ore, ilmenite or any other autocaustizicing chemical can be fed to the furnace mixed with the concentrate or separately.
  • Wood can be processed chemically or mechanically to produce fibers suitable for papermaking.
  • chemical processes lignin binding the fibers of wood together is dissolved in a chemical process at an elevated temperature and pressure.
  • the chemical solution may be either acidic or basic.
  • alkaline cooking process known as sulphate or kraft cooking NaOH and Na 2 S are used as cooking chemicals. Pulp yield prior to bleaching is about 50%.
  • Dissolved wood substances and cooking chemicals are recovered from the fiber in a washing system as a solution having a total solids content above 10%, the remainder being water. This spent liquor is concentrated by evaporation, whereupon it is combusted in a chemical recovery boiler under reducing conditions.
  • the heat content of organic material dissolved from wood is recovered as high-pressure steam, from which electricity and process steam of a lower pressure is produced, generally by means of a turbogenerator.
  • the chemicals form a melt at the bottom of the recovery boiler, which melt is dissolved in water.
  • the solution having Na 2 CO 3 and Na 2 S as main components is converted by a conventional causticizing process into cooking chemicals suitable for reuse.
  • thermo mechanical pulping process i.e. a TMP process
  • COD chemical oxygen demand
  • thermo mechanical refining or CTMP plants are not equally often integrated with a paper mill, but rather, the produced pulp is bleached, dried and transported for use elsewhere.
  • the chemical oxygen demand of wastewater from this process may be twice or more compared to conventional mechanically refined pulp, whereby also the costs of waste water treatment in a biological treatment plant is roughly at least doubled.
  • spent chemicals cannot be recovered, but instead, they are often dumped in nearby waterways thus forming a potential environmental hazard.
  • it is known that the operation of a biological treatment plant is problematic due to extractives dissolved from wood into the wastewater. An original function of the extractives is to protect wood against decay and microbes.
  • the CTMP-process produces fibres at a high yield of above 90%.
  • the fibres in numerous applications can replace kraft pulp.
  • the investment costs in relation to production capacity are considerably lower than in a sulphate pulping process.
  • chips are traditionally impregnated with a Na 2 SO 3 solution.
  • chemical consumption in impregnation is about 20 kg / ton pulp or higher.
  • the pulp is bleached by using at least 20 kg H 2 O 2 /ton pulp together with an equal amount of NaOH. Further, up to 20 kg sodium silicate per ton pulp is generally used as an inhibitor.
  • said problem can be solved by carrying out causticizing (partial or complete) in a carbonate ash dissolving vessel by adding CaO into it and to have normal causticizing reaction to proceed.
  • Formed CaCO 3 is separated in a filter or centrifuge resulting in partly causticized liquor for bleaching.
  • calcium carbonate can be fed into the combustion furnace where it is calcined into CaO.
  • ferric oxide as iron ore, titanium oxide as titanium ore, sodium borate, ilmenite or any other autocaustizicing chemical can be fed to the furnace mixed with concentrate or separately.
  • Oxidized green liquor from a running BCTMP mill was used for the tests. Said liquor had following analysis: Total sodium 3.9 mol/l SO 4 0.54 mol/l(a) or 0.40 mol/l(b) * S 2 O 3 0.025 mol/l Dregs 30 mg/l Causticity 33 %
  • the reults confirm that partial recausticizing is a real possibility.
  • Used calcium carbonate can be reused by drying it and by feeding it into a concentrate combustion furnace to be converted into calcium oxide or by mixing it into evaporated wastewater as moist and by feeding it into final concentrators and further into a furnace.

Landscapes

  • Paper (AREA)
EP07397025A 2007-07-25 2007-07-25 Procédé de récupération de produits chimiques dans une mise en pâte mécanique Withdrawn EP2025807A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07397025A EP2025807A1 (fr) 2007-07-25 2007-07-25 Procédé de récupération de produits chimiques dans une mise en pâte mécanique
US11/889,030 US20090025892A1 (en) 2007-07-25 2007-08-08 Method to recover chemicals in mechanical pulping

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07397025A EP2025807A1 (fr) 2007-07-25 2007-07-25 Procédé de récupération de produits chimiques dans une mise en pâte mécanique

Publications (1)

Publication Number Publication Date
EP2025807A1 true EP2025807A1 (fr) 2009-02-18

Family

ID=39092275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07397025A Withdrawn EP2025807A1 (fr) 2007-07-25 2007-07-25 Procédé de récupération de produits chimiques dans une mise en pâte mécanique

Country Status (2)

Country Link
US (1) US20090025892A1 (fr)
EP (1) EP2025807A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014076361A1 (fr) * 2012-11-16 2014-05-22 Andritz Oy Procédé pour la lixiviation de cendre de chaudière de récupération

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7892993B2 (en) * 2003-06-19 2011-02-22 Eastman Chemical Company Water-dispersible and multicomponent fibers from sulfopolyesters
CA2754521C (fr) * 2009-03-09 2015-11-10 Kiram Ab Procede de fabrication de cellulose faconnee associe a un systeme de recuperation d'usine de pate a papier
US20110171107A1 (en) * 2010-01-07 2011-07-14 California Institute Of Technology System for halting the increase in atmospheric carbon dioxide and method of operation thereof
US9927061B2 (en) 2012-07-27 2018-03-27 W. L. Gore & Associates Gmbh Envelope for a laminar structure providing adaptive thermal insulation
WO2014019611A1 (fr) 2012-07-31 2014-02-06 W. L. Gore & Associates Gmbh Enveloppe pour une structure laminaire fournissant une isolation thermique adaptative

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633351A1 (fr) * 1991-03-01 1995-01-11 Domtar, Inc. Recyclage de déchets cellulosiques
WO1997023687A1 (fr) * 1995-12-22 1997-07-03 Combustion Engineering, Inc. Procede de gazeification de liqueur noire et regeneration de la liqueur de reduction en pate
WO1997037944A1 (fr) * 1996-04-03 1997-10-16 Jaakko Pöyry Oy Procede d'oxydation de liquides residuaires contenant des substances organiques
US20050150440A1 (en) * 2004-01-14 2005-07-14 Rinheat Oy Method for combusting an organic waste concentrate containing alkali metal compounds under oxidative conditions
EP1566480A1 (fr) * 2002-11-05 2005-08-24 Nippon Rensui Co. Procede de production de pate kraft
US20060201641A1 (en) * 2001-08-07 2006-09-14 Bioregional Minimills (Uk) Limited Methods for producing pulp and treating black liquor
US20070051482A1 (en) * 1997-05-21 2007-03-08 Olsen Gary A Method for kraft waste reclamation
EP1777338A1 (fr) * 2005-10-18 2007-04-25 Kvaerner Power Oy Procédé d'épuration des gaz d'échappement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726236A (en) * 1928-09-26 1929-08-27 Herschel C Parker Electrochemical treatment of saline and alkaline solutions
US5284550A (en) * 1992-06-18 1994-02-08 Combustion Engineering, Inc. Black liquier gasification process operating at low pressures using a circulating fluidized bed

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633351A1 (fr) * 1991-03-01 1995-01-11 Domtar, Inc. Recyclage de déchets cellulosiques
WO1997023687A1 (fr) * 1995-12-22 1997-07-03 Combustion Engineering, Inc. Procede de gazeification de liqueur noire et regeneration de la liqueur de reduction en pate
WO1997037944A1 (fr) * 1996-04-03 1997-10-16 Jaakko Pöyry Oy Procede d'oxydation de liquides residuaires contenant des substances organiques
US20070051482A1 (en) * 1997-05-21 2007-03-08 Olsen Gary A Method for kraft waste reclamation
US20060201641A1 (en) * 2001-08-07 2006-09-14 Bioregional Minimills (Uk) Limited Methods for producing pulp and treating black liquor
EP1566480A1 (fr) * 2002-11-05 2005-08-24 Nippon Rensui Co. Procede de production de pate kraft
US20050150440A1 (en) * 2004-01-14 2005-07-14 Rinheat Oy Method for combusting an organic waste concentrate containing alkali metal compounds under oxidative conditions
EP1777338A1 (fr) * 2005-10-18 2007-04-25 Kvaerner Power Oy Procédé d'épuration des gaz d'échappement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014076361A1 (fr) * 2012-11-16 2014-05-22 Andritz Oy Procédé pour la lixiviation de cendre de chaudière de récupération
US9719209B2 (en) 2012-11-16 2017-08-01 Andritz Oy Method for leaching recovery-boiler ash

Also Published As

Publication number Publication date
US20090025892A1 (en) 2009-01-29

Similar Documents

Publication Publication Date Title
US8246779B2 (en) Maintenance of sulfur concentration in Kraft pulp processes
NO300929B1 (no) Fremgangsmåte for bleking av lignocellulosematerialer
US20090025892A1 (en) Method to recover chemicals in mechanical pulping
AU2020222028B2 (en) A method of replacing sodium losses in a pulp mill, a method of producing bleached cellulosic pulp, and a system
NO140535B (no) Fremgangsmaate for fremstilling av cellulosemasse ved oppslutning med oksygen
RU2675454C2 (ru) Способ обработки использованного промывочного раствора в процессе извлечения лигнина
EP1543193A1 (fr) Processus alcalin destine a la fabrication d'une pulpe au moyen de metaborate alcalin utilise comme alcali tampon
AT501844B1 (de) Verfahren zur verbrennung eines alkalische verbindungen enthaltenden organischen abfallkonzentrats unter oxidativen bedingungen
FI129114B (en) Method and device for treating liquid streams in a cellulose factory
CA2767903C (fr) Methode de production d'hydroxyde de sodium a partir d'un effluent de production de pulpe fibreuse
WO2014072586A1 (fr) Procédé et système de traitement de flux de liquide dans une usine de pâte chimique
SE1550598A1 (sv) A method and a system for treating liquid flows at a chemical pulp mill
US5507912A (en) Kraft pulping process wherein sulphide-rich and sulphide-lean white liquors are generated
US20230272581A1 (en) Methods of treating a kraft process recovery cycle to reduce metal levels at the kraft process
CA1064206A (fr) Methode de recuperation de substances par l'extraction de solutions usees de la delignification de matieres lignocellulosiques au moyen d'agents de blanchiment generateurs de chlorure
US20060124257A9 (en) Method for bleaching mechanically defibered pulp
US11655589B2 (en) Method and a system for adjusting PH of green liquor dregs
Nardi et al. Pulp and paper industry wastewaters and pollutants: characteristics, recovery, and utilization
FI62357B (fi) Foerfarande foer framstaellning av fibermassa
NO172698B (no) Fremgangsmaate ved fremstilling av cellulosemasse
SE528837C2 (sv) Peroxidblekning av mekanisk massa med alkalimetallaluminat som alkali
BRPI0705162B1 (pt) Processo aperfeiçoado de tratamento terciário dos efluentes líquidos da indústria de papel e celulose

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17P Request for examination filed

Effective date: 20090529

17Q First examination report despatched

Effective date: 20090625

AKX Designation fees paid

Designated state(s): AT SE

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20091106