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WO1997010384A3 - Process and arrangement for monitoring cellulose digestion - Google Patents

Process and arrangement for monitoring cellulose digestion Download PDF

Info

Publication number
WO1997010384A3
WO1997010384A3 PCT/DE1996/001720 DE9601720W WO9710384A3 WO 1997010384 A3 WO1997010384 A3 WO 1997010384A3 DE 9601720 W DE9601720 W DE 9601720W WO 9710384 A3 WO9710384 A3 WO 9710384A3
Authority
WO
WIPO (PCT)
Prior art keywords
digestion
arrangement
monitoring
cellulose
measurement
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.)
Ceased
Application number
PCT/DE1996/001720
Other languages
German (de)
French (fr)
Other versions
WO1997010384A2 (en
Inventor
Klaus Fischer
Herbert Furumoto
Uwe Lampe
Ingeborg Schmidt
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to CA002232171A priority Critical patent/CA2232171A1/en
Priority to EP96939808A priority patent/EP0850333A2/en
Publication of WO1997010384A2 publication Critical patent/WO1997010384A2/en
Publication of WO1997010384A3 publication Critical patent/WO1997010384A3/en
Anticipated expiration legal-status Critical
Priority to NO981172A priority patent/NO981172L/en
Ceased 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
    • D21C7/00—Digesters
    • D21C7/12—Devices for regulating or controlling
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/228—Automation of the pulping processes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/343—Paper pulp

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Paper (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

The determination of the end of the digestion time is essential in cellulose digestion for the product quality and/or yield. According to the invention, this is done by measurement of the pH in-situ and possibly the colour of the digestion acid during digestion. The process may be used in both discontinuously and continuously operating cellulose digesters. An arrangement for implementing the process with suitable sensors for the on-line measurement of at least the pH has an evaluator with a computer (70), in which said computer (70) determines the digestion time from the measurement values or their time variation.
PCT/DE1996/001720 1995-09-15 1996-09-12 Process and arrangement for monitoring cellulose digestion Ceased WO1997010384A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002232171A CA2232171A1 (en) 1995-09-15 1996-09-12 Process and arrangement for monitoring the cooking of pulp
EP96939808A EP0850333A2 (en) 1995-09-15 1996-09-12 Process and arrangement for monitoring cellulose digestion
NO981172A NO981172L (en) 1995-09-15 1998-03-16 Method and apparatus for monitoring cellulose boiling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19534377.8 1995-09-15
DE19534377 1995-09-15

Publications (2)

Publication Number Publication Date
WO1997010384A2 WO1997010384A2 (en) 1997-03-20
WO1997010384A3 true WO1997010384A3 (en) 1997-05-09

Family

ID=7772349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001720 Ceased WO1997010384A2 (en) 1995-09-15 1996-09-12 Process and arrangement for monitoring cellulose digestion

Country Status (5)

Country Link
EP (1) EP0850333A2 (en)
CA (1) CA2232171A1 (en)
NO (1) NO981172L (en)
WO (1) WO1997010384A2 (en)
ZA (1) ZA967695B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6235123B1 (en) 1998-05-04 2001-05-22 Honeywell-Measorek Corporation Chemical cleaning system for electrodes used in a liquid environment
DE10041077A1 (en) * 2000-08-22 2002-03-21 Siemens Ag Process control process in pulp production
DE10350075A1 (en) * 2003-10-27 2005-06-09 Siemens Ag Process and device for process control in the pulp cooking

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630832A (en) * 1969-11-10 1971-12-28 Int Paper Canada Controlled alkaline sulfite pulping
EP0180071A1 (en) * 1984-10-13 1986-05-07 Pfaudler Werke GmbH Measuring probe
EP0245536A2 (en) * 1986-05-13 1987-11-19 Bio-Rad Laboratories, Inc. Method of controlling the degree of digestion of lignocellulose-containing materials
EP0492364A1 (en) * 1990-12-21 1992-07-01 Siemens Aktiengesellschaft Control system to monitor the production of pulp in a discontinuous digester
DE4118507A1 (en) * 1991-06-06 1992-12-10 Thale Eisen Huettenwerk Measurement arrangement for pH value or redox potential - has enamelled probe carrier in enamelled container with short life probe parts replaceable at low cost
US5420682A (en) * 1993-07-02 1995-05-30 Honeywell Inc. Method and apparatus for compensating spectral data with a color sensor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630832A (en) * 1969-11-10 1971-12-28 Int Paper Canada Controlled alkaline sulfite pulping
EP0180071A1 (en) * 1984-10-13 1986-05-07 Pfaudler Werke GmbH Measuring probe
EP0245536A2 (en) * 1986-05-13 1987-11-19 Bio-Rad Laboratories, Inc. Method of controlling the degree of digestion of lignocellulose-containing materials
EP0492364A1 (en) * 1990-12-21 1992-07-01 Siemens Aktiengesellschaft Control system to monitor the production of pulp in a discontinuous digester
DE4118507A1 (en) * 1991-06-06 1992-12-10 Thale Eisen Huettenwerk Measurement arrangement for pH value or redox potential - has enamelled probe carrier in enamelled container with short life probe parts replaceable at low cost
US5420682A (en) * 1993-07-02 1995-05-30 Honeywell Inc. Method and apparatus for compensating spectral data with a color sensor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
R. PATT ET AL.: "Kontinuierliche Aufschlusskontrolle beim Sulfitverfahren", PAPIER, DAS, vol. 41, no. 10a, October 1987 (1987-10-01), DARMSTADT DE, pages V7 - V13, XP002027644 *
ZOCHBAUER M: "FOTOMETRISCHE INLINE-MESSANORDNUNG ZUR KONZENTRATIONSBESTIMMUNG IN FLUSSIGKEITEN", TECHNISCHES MESSEN TM 1982 - 1988 INCOMPLETE, MUNCHEN, DE, vol. 55, no. 11, November 1988 (1988-11-01), MÜNCHEN, DE, pages 459 - 464, XP000001841 *

Also Published As

Publication number Publication date
WO1997010384A2 (en) 1997-03-20
NO981172D0 (en) 1998-03-16
NO981172L (en) 1998-05-14
ZA967695B (en) 1997-03-17
CA2232171A1 (en) 1997-03-20
EP0850333A2 (en) 1998-07-01

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