ATE48452T1 - CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES. - Google Patents

CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES.

Info

Publication number
ATE48452T1
ATE48452T1 AT86890168T AT86890168T ATE48452T1 AT E48452 T1 ATE48452 T1 AT E48452T1 AT 86890168 T AT86890168 T AT 86890168T AT 86890168 T AT86890168 T AT 86890168T AT E48452 T1 ATE48452 T1 AT E48452T1
Authority
AT
Austria
Prior art keywords
chlorine
pulp
mixer
treatment
chlorine gas
Prior art date
Application number
AT86890168T
Other languages
German (de)
Inventor
Michael I Sherman
Joseph R Phillips
Gordon Rowlandson
Original Assignee
Kamyr Inc
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 Kamyr Inc filed Critical Kamyr Inc
Application granted granted Critical
Publication of ATE48452T1 publication Critical patent/ATE48452T1/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
    • D21C9/12—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)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Treating Waste Gases (AREA)
  • Treatment Of Sludge (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • External Artificial Organs (AREA)
  • Materials For Medical Uses (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A method and apparatus are provided for increasing the efficiency of treatment of a paper pulp slurry with chlorine gas, such as in the bleaching or delignification of deciduous wood chemical pulps, coniferous wood chemical pulps, and non-wood fibrous chemical pulps. Chlorine gas is intimately mixed with the pulp in a fluidizing mixer (14), the pulp preferably having a consistency of about 7-12%, and then is passed to a retention vessel (20). The discharge of pulp from the mixer to the retention vessel, and from the retention vessel to other treatment structures, is throttled by valves (30, 31) so as to increase the pressure in both the mixer and the retention vessel to above atmospheric, and preferably in the range of about 15-150 psig (1 to 10 bar above atmospheric pressure). The chlorine gas is added to the mixer through one more discs (53) of porous materials having pore sizes in the range of about 5-175 microns, such as porous ceramic or sintered metal discs. The increased pressure during the chlorine treatment, and the introduction of the chlorine gas in the form of minute bubbles, improve the solubility of the chlorine in the pulp slurry and thereby increase the efficiency of treatment. (Figure 1).
AT86890168T 1985-06-14 1986-06-06 CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES. ATE48452T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74467885A 1985-06-14 1985-06-14
EP86890168A EP0207062B1 (en) 1985-06-14 1986-06-06 Pressurized pulp chlorination, and chlorine introduction in minute bubbles

Publications (1)

Publication Number Publication Date
ATE48452T1 true ATE48452T1 (en) 1989-12-15

Family

ID=24993592

Family Applications (1)

Application Number Title Priority Date Filing Date
AT86890168T ATE48452T1 (en) 1985-06-14 1986-06-06 CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES.

Country Status (9)

Country Link
EP (1) EP0207062B1 (en)
JP (1) JPS61289192A (en)
AT (1) ATE48452T1 (en)
BR (1) BR8602738A (en)
CA (1) CA1276408C (en)
DE (1) DE3667310D1 (en)
FI (1) FI85728C (en)
NO (1) NO168123C (en)
SE (1) SE466459B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US56833A (en) * 1866-07-31 Improvement in bleaching paper-stock
US1971241A (en) * 1933-04-01 1934-08-21 Pennsylvania Salt Mfg Co Method of chlorination
DE1621684A1 (en) * 1967-10-04 1971-07-08 Bellmer Geb Kg Maschf Machine combination for the line section in pulp processing plants
SE387671B (en) * 1973-04-27 1976-09-13 Mo Och Domsjoe Ab COMPACT WHITE BLEACHING, NON-FLUFFAT LIQUID LIGNOCELLULOSE MATERIAL WITH GASY BLEACHING, PREFERABLY ACID GAS

Also Published As

Publication number Publication date
EP0207062A1 (en) 1986-12-30
SE8602592L (en) 1986-12-15
SE466459B (en) 1992-02-17
NO168123C (en) 1992-01-15
SE8602592D0 (en) 1986-06-10
EP0207062B1 (en) 1989-12-06
FI862082A0 (en) 1986-05-19
FI85728C (en) 1992-05-25
CA1276408C (en) 1990-11-20
BR8602738A (en) 1987-02-10
FI862082L (en) 1986-12-15
JPS61289192A (en) 1986-12-19
DE3667310D1 (en) 1990-01-11
FI85728B (en) 1992-02-14
NO168123B (en) 1991-10-07
NO862116L (en) 1986-12-15

Similar Documents

Publication Publication Date Title
CA2012771A1 (en) Method of bleaching cellulose pulp with ozone
US4080249A (en) Delignification and bleaching of a lignocellulosic pulp slurry with ozone
RO107715B1 (en) Celluloses whitening, without chlorine process
ATE120816T1 (en) OZONE BLEACHING OF MEDIUM CONSISTENCY PULP.
ES8704569A1 (en) Sulphite pulping process for preparing cellulose pulp from lignocellulosic materials with recovery of the pulping chemicals.
FI890700A0 (en) Process for bleaching cellulose pulp
ATE54475T1 (en) PROCESSES FOR BLEACHING AND DELIGNIFICATION OF PULP-CONTAINING PRODUCTS.
NZ218294A (en) Dispersing and dissolving of a gas, such as oxygen, or gases in a pulp slurry for use in bleaching the pulp
DE3667310D1 (en) PULP CHLORINE UNDER PRESSURE AND CHLORINE INTRODUCTION IN BLAESCHEN.
FI62362B (en) LIGNINAVLAEGSNING OCH BLEKNING AV LIGNOCELLULOSAMASSA MED OZON
DE59007258D1 (en) Process for bleaching cellulosic materials and plant for carrying out the process.
NZ216726A (en) Use of lignin-degrading enzymes from phanerochaete chrysosporium for treatment of wood pulp and e1 effluent
DE59705632D1 (en) Process for the production of pulp
RU92016575A (en) A METHOD OF ACHIEVING AN IMPROVED DELHINIFICATION SELECTIVITY OF UNCLEARED FIBROUS WEIGHT
WO1992008842A3 (en) Method for producing dietary fibers from nonwoody lignocellulosic substrates by oxidation
McKeown et al. Mixing characteristics of aerated stabilization basins
AU576394B2 (en) Process for the preparation of chemical paper pulp for bleaching
SU1258929A1 (en) Pulp composition for making parchment paper
GB1455399A (en) Method for digesting wood
JPH05186991A (en) Method for bleaching cellulose pulp
Lincoln et al. METHOD OF BLEACHING WOOD PULP
RO102716B1 (en) Dispersing solution for cellulosic particles and producing method therefore

Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee