SE7506844L - PROCEDURE FOR AUTOMATIC CONTROL OF THE DOSAGE OF TWO CHEMICALS - Google Patents

PROCEDURE FOR AUTOMATIC CONTROL OF THE DOSAGE OF TWO CHEMICALS

Info

Publication number
SE7506844L
SE7506844L SE7506844A SE7506844A SE7506844L SE 7506844 L SE7506844 L SE 7506844L SE 7506844 A SE7506844 A SE 7506844A SE 7506844 A SE7506844 A SE 7506844A SE 7506844 L SE7506844 L SE 7506844L
Authority
SE
Sweden
Prior art keywords
pulp
chlorine
pretreatment
hardness
chlorination
Prior art date
Application number
SE7506844A
Other languages
Swedish (sv)
Inventor
J Soininen
P Hyveri
Original Assignee
Kaukas Ab Oy
Nokia Oy Ab
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 Kaukas Ab Oy, Nokia Oy Ab filed Critical Kaukas Ab Oy
Publication of SE7506844L publication Critical patent/SE7506844L/en

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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

A method for automatic control of the dosageing of chlorine dioxide and chlorine and for controlling the quality of pulp by instrumentation in a continuous pulp bleaching process. The process involves at least one chlorination step preceded by pretreatment of the pulp with chlorine dioxide. The hardness of the unbleached pulp, washing losses, and other factors affecting the total demand on active chlorine, or the variation of these factors, are observed, e.g., by means of laboratory methods. The relative share of the chlorine dioxide dosaged in connection with the pretreatment in the total quantity of active chlorine that is dosaged in the pretreatment and in the chlorination stage together is made to follow the hardness of the unbleached pulp, the desired hardness after the chlorination stage or after the alkali stage following after the chlorination stage, and possibly some other process variables. The following takes place in accordance with a mathematical empire function that is being constantly calculated.
SE7506844A 1974-06-14 1975-06-13 PROCEDURE FOR AUTOMATIC CONTROL OF THE DOSAGE OF TWO CHEMICALS SE7506844L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI741828A FI50745C (en) 1974-06-14 1974-06-14 Procedure for automatic control of the dosage of two chemicals.

Publications (1)

Publication Number Publication Date
SE7506844L true SE7506844L (en) 1975-12-15

Family

ID=8506257

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7506844A SE7506844L (en) 1974-06-14 1975-06-13 PROCEDURE FOR AUTOMATIC CONTROL OF THE DOSAGE OF TWO CHEMICALS

Country Status (3)

Country Link
CA (1) CA1057906A (en)
FI (1) FI50745C (en)
SE (1) SE7506844L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510740C2 (en) 1996-11-26 1999-06-21 Sunds Defibrator Ind Ab Oxygen delignification control
US6153050A (en) * 1998-03-24 2000-11-28 Noranda Forest Inc. Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage

Also Published As

Publication number Publication date
CA1057906A (en) 1979-07-10
FI182874A (en) 1975-12-15
FI50745C (en) 1976-06-10
FI50745B (en) 1976-03-01

Similar Documents

Publication Publication Date Title
ATE3656T1 (en) APPARATUS AND METHOD FOR DELIGNIFYING A MEDIUM CONSISTENCY PULP BY OXYGEN.
BR9813747B1 (en) bleaching of chemical pulp with peracid.
SE7705513L (en) PROCEDURE FOR REGULATING THE SUPPLY OF REACTION CHEMICALS IN DELIGNIFICATION OF CELLULOSE MATERIAL
GB1145339A (en) Improvements in or relating to the bleaching of cellulosic material
SE7506844L (en) PROCEDURE FOR AUTOMATIC CONTROL OF THE DOSAGE OF TWO CHEMICALS
NO912641L (en) CONTINUOUS, 2-step bleaching process for paper pulp.
ES372563A1 (en) Process of hydrophilization, purification and bleaching of cellulose fibers
DE69100049D1 (en) REDUCTION OF HALOGENED ORGANIC COMPOUNDS IN THE LEAKAGE DRAINAGE.
FR2436846A1 (en) PROCESS FOR COMPLETELY BLEACHING CELLULOSE
FR2174128A1 (en) Continuous cellulose bleaching - using reading as control parameter
JPS51141646A (en) Method for manufacturing fiber for light communication
CA1068054A (en) Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical
FR2158873A5 (en) Bleaching of wood cellulose - using nitrogen oxides
SE8803705L (en) OXYGEN WHITING
ES399036A1 (en) A procedure for the blasting of a cellulose pasta. (Machine-translation by Google Translate, not legally binding)
SE8008336L (en) PROCEDURE FOR DELIGNIFICATION / WHITING OF CELLULOSAMASSA
SU688878A1 (en) Method of determining hardness of textile fibres and filaments
FR2237843A1 (en) Bleaching and clarifying of aqueous effluent - using finely divided air with small amount of ozone and opt. chlorine
SU391471A1 (en) METHOD FOR DETERMINING THE SUSTAINABILITY OF SULFUR ACID ETHERES OF LEUKE COMPOUNDS OF CUBE DYES
ES393360A1 (en) Method for producing bast fibres
GB1170686A (en) A process for Bleaching Cellulose Pulp and a Pulp Bleached according to the process
NO149552B (en) PROCEDURE FOR THE TREATMENT OF LIGNOCELLULOSE-CONTAINED FIBER MASS.
FR66256E (en) Continuous process for bleaching cellulose textiles using alkali or alkaline earth chlorites
ATE35433T1 (en) METHODS OF PREPARING CHEMICAL WOOD PULP FOR BLEACHING.
SE7510677L (en) PROCEDURE FOR THE PREPARATION OF CELLULOSA ACCORDING TO THE SULPHITE METHOD