CA2293223A1 - Electrochemical method for determinating lignin content of pulp - Google Patents
Electrochemical method for determinating lignin content of pulp Download PDFInfo
- Publication number
- CA2293223A1 CA2293223A1 CA002293223A CA2293223A CA2293223A1 CA 2293223 A1 CA2293223 A1 CA 2293223A1 CA 002293223 A CA002293223 A CA 002293223A CA 2293223 A CA2293223 A CA 2293223A CA 2293223 A1 CA2293223 A1 CA 2293223A1
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- lignin
- voltammetric
- kappa
- redox
- 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.)
- Granted
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
- 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1052—Controlling the process
-
- 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
- D21C9/1021—Electrochemical processes
Abstract
This invention describes a new method to measure kappa number or lignin content of kraft pulps based on the voltammetric measurement of catalytic reactions involving lignin and redox mediators. This method comprises measuring the rate of regeneration of a lignin redox catalyst in the presence of pulp following its oxidation at a voltammetric electrode.
The intensity of the catalytic current generated at the electrode surface is shown to be proportional to the amount of lignin present in a pulp. Within pulp types (softwood, hardwood or oxygen delignified) linear relationships can be obtained between the intensities of the generated current and a range of kappa numbers. The redox characteristics and concentration of the mediator, and the voltage sweep rate of the voltammetric procedure, are among parameters that can be tuned to obtained linear relationships with kappa number of various pulps. Automation of this method can lead to development of a novel on-line electro-kappa analyzer to be used for either pulping or bleaching process control.
The intensity of the catalytic current generated at the electrode surface is shown to be proportional to the amount of lignin present in a pulp. Within pulp types (softwood, hardwood or oxygen delignified) linear relationships can be obtained between the intensities of the generated current and a range of kappa numbers. The redox characteristics and concentration of the mediator, and the voltage sweep rate of the voltammetric procedure, are among parameters that can be tuned to obtained linear relationships with kappa number of various pulps. Automation of this method can lead to development of a novel on-line electro-kappa analyzer to be used for either pulping or bleaching process control.
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002293223A CA2293223C (en) | 1999-12-23 | 1999-12-23 | Electrochemical method for determinating lignin content of pulp |
AU21373/01A AU2137301A (en) | 1999-12-23 | 2000-12-19 | Electrochemical method for determinating lignin content of pulp |
PT00984729T PT1240384E (en) | 1999-12-23 | 2000-12-19 | ELECTROCHEMICAL METHOD FOR DETERMINING THE CONTENT OF LENHINA PASTE |
JP2001548803A JP2003518613A (en) | 1999-12-23 | 2000-12-19 | An electrochemical method for determining the lignin content of pulp |
PCT/CA2000/001518 WO2001048307A1 (en) | 1999-12-23 | 2000-12-19 | Electrochemical method for determinating lignin content of pulp |
ES00984729T ES2208445T3 (en) | 1999-12-23 | 2000-12-19 | ELCTROCHEMICAL PROCEDURE TO DETERMINE THE LIGNIN CONTENT OF THE CELLULOSE PASTE. |
EP00984729A EP1240384B1 (en) | 1999-12-23 | 2000-12-19 | Electrochemical method for determining lignin content of pulp |
AT00984729T ATE252177T1 (en) | 1999-12-23 | 2000-12-19 | ELECTROCHEMICAL METHOD FOR DETERMINING THE LIGNIN CONTENT IN PULP |
DE60005997T DE60005997D1 (en) | 1999-12-23 | 2000-12-19 | ELECTROCHEMICAL METHOD FOR DETERMINING THE LIGNIN CONTENT IN PULP |
BR0016663-4A BR0016663A (en) | 1999-12-23 | 2000-12-19 | Methods to determine a pulp's cover number or lignin content, and to analyze a pulp's lignin content, and automated online procedure for determining the cover number |
US10/157,601 US20020144795A1 (en) | 1999-12-23 | 2002-05-30 | Electrochemical method for determinating lignin content of pulp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002293223A CA2293223C (en) | 1999-12-23 | 1999-12-23 | Electrochemical method for determinating lignin content of pulp |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2293223A1 true CA2293223A1 (en) | 2001-06-23 |
CA2293223C CA2293223C (en) | 2004-02-10 |
Family
ID=4164977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002293223A Expired - Fee Related CA2293223C (en) | 1999-12-23 | 1999-12-23 | Electrochemical method for determinating lignin content of pulp |
Country Status (11)
Country | Link |
---|---|
US (1) | US20020144795A1 (en) |
EP (1) | EP1240384B1 (en) |
JP (1) | JP2003518613A (en) |
AT (1) | ATE252177T1 (en) |
AU (1) | AU2137301A (en) |
BR (1) | BR0016663A (en) |
CA (1) | CA2293223C (en) |
DE (1) | DE60005997D1 (en) |
ES (1) | ES2208445T3 (en) |
PT (1) | PT1240384E (en) |
WO (1) | WO2001048307A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10043893A1 (en) * | 2000-09-06 | 2002-03-14 | Voith Paper Patent Gmbh | Process for carrying out a flotation, bleaching and / or dispersing process used for fiber or paper production |
EP2548955A1 (en) | 2006-02-14 | 2013-01-23 | Verenium Corporation | Xylanases, nucleic acids encoding them and methods for making and using them |
JP5744518B2 (en) | 2007-10-03 | 2015-07-08 | ビーピー・コーポレーション・ノース・アメリカ・インコーポレーテッド | Xylanase, nucleic acids encoding xylanase and methods for producing and using them |
GB2476237B (en) * | 2009-12-15 | 2012-01-11 | Schlumberger Holdings | Calibration of electrochemical sensor |
CN107607596B (en) * | 2017-08-08 | 2019-09-06 | 福建农林大学 | A kind of online test method and device of the sulfate pulping process paper pulp kappa number based on flow analysis |
CN107589158B (en) * | 2017-08-08 | 2019-09-06 | 福建农林大学 | A kind of online test method and device of the sulfate pulping process paper pulp kappa number based on double electrochemical sensors |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4065348A (en) * | 1975-04-23 | 1977-12-27 | Westvaco Corporation | Method and apparatus for detecting and controlling the caustic in paper pulp bleaching |
FI80526C (en) * | 1986-09-08 | 1990-06-11 | Savcor Consulting Oy | Method for controlling cellulose boiling |
DD280790A1 (en) * | 1987-04-14 | 1990-07-18 | Akad Wissenschaften Ddr | BIOSENSOR AND METHOD FOR DETERMINING MEDIATORS |
US5220172A (en) * | 1991-09-23 | 1993-06-15 | The Babcock & Wilcox Company | Fluorescence analyzer for lignin |
US5389356A (en) * | 1993-01-05 | 1995-02-14 | Utah State University Foundation | Compounds and methods for generating oxygen free radicals used in general oxidation and reduction reactions |
US5486915A (en) * | 1994-04-12 | 1996-01-23 | The Babcock & Wilcox Company | On-line measurement of lignin in wood pulp by color shift of fluorescence |
DE19742748A1 (en) * | 1997-09-27 | 1999-04-01 | Degussa | Process for delignifying and bleaching pulps using electrochemically oxidizable organic compounds |
US5953111A (en) * | 1997-12-11 | 1999-09-14 | Honeywell Inc. | Continuous in-line kappa measurement system |
ATE224476T1 (en) * | 1998-04-16 | 2002-10-15 | Pulp Paper Res Inst | METHOD FOR PULP AND DYE OXIDATION USING OXIDASE |
-
1999
- 1999-12-23 CA CA002293223A patent/CA2293223C/en not_active Expired - Fee Related
-
2000
- 2000-12-19 EP EP00984729A patent/EP1240384B1/en not_active Expired - Lifetime
- 2000-12-19 PT PT00984729T patent/PT1240384E/en unknown
- 2000-12-19 JP JP2001548803A patent/JP2003518613A/en active Pending
- 2000-12-19 DE DE60005997T patent/DE60005997D1/en not_active Expired - Lifetime
- 2000-12-19 AU AU21373/01A patent/AU2137301A/en not_active Abandoned
- 2000-12-19 ES ES00984729T patent/ES2208445T3/en not_active Expired - Lifetime
- 2000-12-19 WO PCT/CA2000/001518 patent/WO2001048307A1/en active IP Right Grant
- 2000-12-19 AT AT00984729T patent/ATE252177T1/en not_active IP Right Cessation
- 2000-12-19 BR BR0016663-4A patent/BR0016663A/en not_active IP Right Cessation
-
2002
- 2002-05-30 US US10/157,601 patent/US20020144795A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
CA2293223C (en) | 2004-02-10 |
ATE252177T1 (en) | 2003-11-15 |
PT1240384E (en) | 2004-03-31 |
WO2001048307A8 (en) | 2002-01-24 |
BR0016663A (en) | 2002-09-03 |
DE60005997D1 (en) | 2003-11-20 |
JP2003518613A (en) | 2003-06-10 |
ES2208445T3 (en) | 2004-06-16 |
US20020144795A1 (en) | 2002-10-10 |
AU2137301A (en) | 2001-07-09 |
EP1240384B1 (en) | 2003-10-15 |
EP1240384A1 (en) | 2002-09-18 |
WO2001048307A1 (en) | 2001-07-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FI109036B (en) | Oxidizing bleaching of wood pulp with vanadium-substituted polyoxometalate | |
WO1998040721A1 (en) | Method and apparatus for monitoring and controlling characteristics of process effluents | |
ES2184432T3 (en) | PROCEDURE WITH OXIDASE FOR OXIDATION OF WOODEN PASTE AND COLORS. | |
CA2293223A1 (en) | Electrochemical method for determinating lignin content of pulp | |
US3962029A (en) | Method of controlling the amount of chemicals in liquids used within the cellulose industry and related industries | |
Bhardwaj et al. | Effects of processing on zeta potential and cationic demand of kraft pulps | |
US6273994B1 (en) | Method and device for measuring bleach requirement, bleachability, and effectivenss of hemicellulase enzyme treatment of pulp | |
FI90888B (en) | Method for bleaching cellulose pulp | |
de Oliveira et al. | Voltammetric determination of persulfate anions using an electrode modified with a Prussian blue film | |
EP0259820B1 (en) | Procedure for controlling cellulose digestion | |
CA2392292C (en) | Determination of kappa number in chemical pulps by raman spectrometry | |
Bourbonnais et al. | Voltammetric measurement of lignin in pulp and paper samples: An electron transfer catalytic approach with mediators | |
Ma et al. | Soft Sensor Model of adsorbable organic halogen based on bleached pulp quality indices | |
Silva et al. | Factors affecting brightness reversion of hardwood kraft pulps | |
US6946056B2 (en) | Method for regulating the manufacturing of pulp by optically measuring the amount of hexenuronic acid | |
US4702807A (en) | Electrochemical process for bleaching wood pulp using chlorate and a redox catalyst | |
Bourbonnais et al. | Voltammetric analysis of the bleachability of softwood kraft pulps | |
Ala-Kaila | Dynamic response in pH and the transient behavior of some chemical elements in pulp-water suspensions | |
USRE32825E (en) | Process for the electrochemical reductive bleaching of lignocellulosic pulp | |
Karhu et al. | Characterization of carboxyl and phenol groups in kraft pulps at different temperatures | |
Saad et al. | Some Aspects of the Cooking Degree Numbers of Unbleached High-yield Soda Bagasse Pulp | |
SU910896A1 (en) | Method of preparing semi-cellulose | |
FI118430B (en) | Peroxide bleaching of pulp, for the production of paper and fibrous products, involves measuring the oxygen concentration, temperature and/or carbon monoxide concentration in reaction area, based on which process is monitored | |
Monrroy et al. | Comparison between UV spectrophotometry and anion exchange chromatography techniques for quantification of hexenuronic acid (HexA) in unbleached kraft pulps of Eucalyptus globulus | |
Agarwal et al. | An FT Raman Study of Residual Lignin In Kraft Pulps |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |