PROCESS AND ARRANGEMENT FOR MONITORING CELLULOSE DIGESTION

Title:

PROCESS AND ARRANGEMENT FOR MONITORING CELLULOSE DIGESTION

Document Type and Number:

WIPO Patent Application WO1997010384

Kind Code:

A3

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.

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Inventors:

FISCHER KLAUS (DE)
FURUMOTO HERBERT (DE)
LAMPE UWE (DE)
SCHMIDT INGEBORG (DE)

Application Number:

PCT/DE1996/001720

Publication Date:

May 09, 1997

Filing Date:

September 12, 1996

Export Citation:

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Assignee:

SIEMENS AG (DE)
FISCHER KLAUS (DE)
FURUMOTO HERBERT (DE)
LAMPE UWE (DE)
SCHMIDT INGEBORG (DE)

International Classes:

D21C3/22; D21C7/12; G01N27/416; G01N33/34; (IPC1-7): D21G7/12; G01N21/85; G01N33/34; G05D21/00

Foreign References:

US3630832A	1971-12-28
DE4118507A1	1992-12-10
US5420682A	1995-05-30
EP0245536A2	1987-11-19
EP0492364A1	1992-07-01
EP0180071A1	1986-05-07

Other References:

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

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