GB1136219A - Improved process for the production of sulphite pulp and a pulp produced according to the process - Google Patents

Improved process for the production of sulphite pulp and a pulp produced according to the process

Info

Publication number
GB1136219A
GB1136219A GB5359965A GB5359965A GB1136219A GB 1136219 A GB1136219 A GB 1136219A GB 5359965 A GB5359965 A GB 5359965A GB 5359965 A GB5359965 A GB 5359965A GB 1136219 A GB1136219 A GB 1136219A
Authority
GB
United Kingdom
Prior art keywords
pulp
digestion
ligno
dec
sulphite
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.)
Expired
Application number
GB5359965A
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.)
Svenska Cellulosa AB
Original Assignee
Svenska Cellulosa 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 Svenska Cellulosa AB filed Critical Svenska Cellulosa AB
Publication of GB1136219A publication Critical patent/GB1136219A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/06—Sulfite or bisulfite pulp
    • 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
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

1,136,219. Paper. SVENSKA CELLULOSA A.B. 17 Dec., 1965 [18 Dec., 1964], No. 53599/65. Headings D2A, D2B and D2W. Ligno-cellulose pulp is made by digesting ligno-cellulose material by a sulphite, (preferably bisulphite) process to render a pulp yield of 65-95%, the digestion being driven so far that the chlorine number of the finished pulp is 15-32, defibrating and/or beating the digested material to achieve a freeness of 11-22‹SR and removing fine material from the pulp in the amount 0.2-7% wt of the pulp. The digestion of the raw material can be carried out with an aqueous solution containing SO 3 <SP>2-</SP> and/or HSO 3 <SP>-</SP> and Na<SP>+</SP>, K<SP>+</SP>, Mg<SP>2+</SP>, Ca<SP>2+</SP> or NH 4 <SP>+</SP> or mixtures thereof, minor amounts of SO 2 may also be present. The initial pH may be 3.0-7.0. The digestion may be at 140-190‹C and 1-12 kg/cm<SP>2</SP> and the digestion liquid may be at least partially waste liquor from a later treatment step. The cooking liquid:wood ratio may be 2.5 to 5.0:1. After digestion, the pulp concentration may be 3-45% and the temperature kept at 0-100‹C for the defibration and/or beating step. The fine material can be removed using a screen or centri cleaner. The pulp produced may be mixed with another type of pulp, e.g. a sulphate pulp. A resin-blocking material which may be hydrophobic and oleophilic, e.g. talc, can be added to the pulp in the amount of 1-20 kg/ton oven dry pulp. A sheet made from the pulp weighing 200 g/m has a maximum air resistance (Gurley) of 60 sec/100m. A product, e.g. linear, fluting, cardboard or corrugated board, prepared from the pulp may have a moisture content of 80-94%.
GB5359965A 1964-12-18 1965-12-17 Improved process for the production of sulphite pulp and a pulp produced according to the process Expired GB1136219A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1537464A SE308061B (en) 1964-12-18 1964-12-18

Publications (1)

Publication Number Publication Date
GB1136219A true GB1136219A (en) 1968-12-11

Family

ID=20300560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5359965A Expired GB1136219A (en) 1964-12-18 1965-12-17 Improved process for the production of sulphite pulp and a pulp produced according to the process

Country Status (5)

Country Link
AT (1) AT277745B (en)
CH (2) CH456330A (en)
FI (1) FI46190B (en)
GB (1) GB1136219A (en)
SE (1) SE308061B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007022750A1 (en) * 2007-05-11 2008-11-13 Voith Patent Gmbh Process for defibering chemically treated lignocellulosic raw material
WO2011113998A1 (en) * 2010-03-15 2011-09-22 Upm-Kymmene Corporation Method for improving the properties of a paper product and forming an additive component and the corresponding paper product and additive component and use of the additive component

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007022750A1 (en) * 2007-05-11 2008-11-13 Voith Patent Gmbh Process for defibering chemically treated lignocellulosic raw material
WO2011113998A1 (en) * 2010-03-15 2011-09-22 Upm-Kymmene Corporation Method for improving the properties of a paper product and forming an additive component and the corresponding paper product and additive component and use of the additive component

Also Published As

Publication number Publication date
CH456330A (en) 1968-07-15
FI46190B (en) 1972-10-02
CH465383A (en) 1968-11-15
AT277745B (en) 1970-01-12
SE308061B (en) 1969-01-27
DE1517219A1 (en) 1969-12-18

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