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CA2038651A1 - Method and apparatus for bleaching pulps - Google Patents

Method and apparatus for bleaching pulps

Info

Publication number
CA2038651A1
CA2038651A1 CA 2038651 CA2038651A CA2038651A1 CA 2038651 A1 CA2038651 A1 CA 2038651A1 CA 2038651 CA2038651 CA 2038651 CA 2038651 A CA2038651 A CA 2038651A CA 2038651 A1 CA2038651 A1 CA 2038651A1
Authority
CA
Canada
Prior art keywords
bleaching
completion
materials
delivered
cavity
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.)
Granted
Application number
CA 2038651
Other languages
French (fr)
Other versions
CA2038651C (en
Inventor
Kwei-Nam Law
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.)
LAW KWEI NAM
Original Assignee
LAW KWEI NAM
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 LAW KWEI NAM filed Critical LAW KWEI NAM
Priority to CA 2038651 priority Critical patent/CA2038651C/en
Publication of CA2038651A1 publication Critical patent/CA2038651A1/en
Application granted granted Critical
Publication of CA2038651C publication Critical patent/CA2038651C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • 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

Landscapes

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

Abstract

This invention relates to a method and an apparatus for continuously bleaching fibrous lignocellulosic materials, for example wood pulps, in which the materials pre-impregnated with bleaching chemicals, form a continuous flow; the said materials being introduced by means of a feed hopper and a screwfeeder into a microwave cavity, heated and bleached by a supply of microwave energy and, after the completion of the heating, delivered from the said cavity into a retention chute where the bleaching action continues until its completion and, after the completion of bleaching, delivered from the bottom of said retention chute for further processing.
CA 2038651 1991-03-19 1991-03-19 Method and apparatus for bleaching pulps Expired - Fee Related CA2038651C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2038651 CA2038651C (en) 1991-03-19 1991-03-19 Method and apparatus for bleaching pulps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2038651 CA2038651C (en) 1991-03-19 1991-03-19 Method and apparatus for bleaching pulps

Publications (2)

Publication Number Publication Date
CA2038651A1 true CA2038651A1 (en) 1992-09-20
CA2038651C CA2038651C (en) 1995-12-12

Family

ID=4147226

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2038651 Expired - Fee Related CA2038651C (en) 1991-03-19 1991-03-19 Method and apparatus for bleaching pulps

Country Status (1)

Country Link
CA (1) CA2038651C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420542A (en) * 2004-11-25 2006-05-31 Kjell Ivar Kasin Screw conveyor with microwave generator
CN101649572B (en) * 2009-08-31 2011-03-16 华南理工大学 Top unloader of pressure type upwash bleaching tower
WO2017178849A1 (en) 2016-04-15 2017-10-19 MIKULIC Marinko A continuous process for production of cellulose pulp
WO2020160955A1 (en) 2019-02-07 2020-08-13 MIKULIC Marinko Continuous process for production of cellulose pulp from grass-like feedstock
CN117364518A (en) * 2023-11-21 2024-01-09 云南云景林纸股份有限公司 Pulping bleaching equipment and process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420542A (en) * 2004-11-25 2006-05-31 Kjell Ivar Kasin Screw conveyor with microwave generator
CN101649572B (en) * 2009-08-31 2011-03-16 华南理工大学 Top unloader of pressure type upwash bleaching tower
WO2017178849A1 (en) 2016-04-15 2017-10-19 MIKULIC Marinko A continuous process for production of cellulose pulp
WO2020160955A1 (en) 2019-02-07 2020-08-13 MIKULIC Marinko Continuous process for production of cellulose pulp from grass-like feedstock
CN117364518A (en) * 2023-11-21 2024-01-09 云南云景林纸股份有限公司 Pulping bleaching equipment and process

Also Published As

Publication number Publication date
CA2038651C (en) 1995-12-12

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed