FR2323806A1 - Lignocellulosic materials chlorination for prodn. of cellulose pulps - utilises control of chlorine partial pressure esp. by addn. of inert gas - Google Patents

Lignocellulosic materials chlorination for prodn. of cellulose pulps - utilises control of chlorine partial pressure esp. by addn. of inert gas

Info

Publication number
FR2323806A1
FR2323806A1 FR7627252A FR7627252A FR2323806A1 FR 2323806 A1 FR2323806 A1 FR 2323806A1 FR 7627252 A FR7627252 A FR 7627252A FR 7627252 A FR7627252 A FR 7627252A FR 2323806 A1 FR2323806 A1 FR 2323806A1
Authority
FR
France
Prior art keywords
chlorine
addn
partial pressure
inert gas
prodn
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.)
Withdrawn
Application number
FR7627252A
Other languages
French (fr)
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.)
Valmet AB
Original Assignee
Sunds 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 Sunds AB filed Critical Sunds AB
Publication of FR2323806A1 publication Critical patent/FR2323806A1/en
Withdrawn legal-status Critical Current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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • 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

Landscapes

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

Abstract

In the gas phase chlorination of lignocellulosic material with a consistency of at least 10%, pref. 15-60 (20-40)%, the chlorine partial pressure which arises at a position in the material in a reaction zone after a suitable predetermined reaction time controls the chlorine addn. in such a way that the chlorine partial pressure at this position remain constant. Pref. a separate inert gas, esp. air, is supplied to the reaction zone, to overcome those types of disturbance in the control of the chlorine additive, caused by variable amts. of inert gas mixt. derived from the lignocellulosic feed material. System enables the chlorine addn. in the gas phase chlorination to be controlled and the residual chlorine leaving with the product to be minimised.
FR7627252A 1975-09-12 1976-09-10 Lignocellulosic materials chlorination for prodn. of cellulose pulps - utilises control of chlorine partial pressure esp. by addn. of inert gas Withdrawn FR2323806A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7510218A SE393645B (en) 1975-09-12 1975-09-12 METHOD AND DEVICE FOR GAS PHASE CHLORINATION OF LIGNOCELLULOSE-CONTAINING MATERIAL

Publications (1)

Publication Number Publication Date
FR2323806A1 true FR2323806A1 (en) 1977-04-08

Family

ID=20325537

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7627252A Withdrawn FR2323806A1 (en) 1975-09-12 1976-09-10 Lignocellulosic materials chlorination for prodn. of cellulose pulps - utilises control of chlorine partial pressure esp. by addn. of inert gas

Country Status (9)

Country Link
JP (1) JPS5237805A (en)
AU (1) AU1739176A (en)
BR (1) BR7605949A (en)
DE (1) DE2640864A1 (en)
FI (1) FI762552A (en)
FR (1) FR2323806A1 (en)
NO (1) NO763110L (en)
SE (1) SE393645B (en)
ZA (1) ZA765443B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166439A (en) * 1974-12-04 1976-06-09 Hitachi Ltd

Also Published As

Publication number Publication date
DE2640864A1 (en) 1977-03-17
AU1739176A (en) 1978-03-09
NO763110L (en) 1977-03-15
JPS5237805A (en) 1977-03-24
FI762552A (en) 1977-03-13
SE7510218L (en) 1977-03-13
SE393645B (en) 1977-05-16
ZA765443B (en) 1977-08-31
BR7605949A (en) 1977-08-16

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Legal Events

Date Code Title Description
ST Notification of lapse