EP0185858B1 - Verfahren zur Delignifizierung von Sulfatzellstoffen - Google Patents

Verfahren zur Delignifizierung von Sulfatzellstoffen Download PDF

Info

Publication number
EP0185858B1
EP0185858B1 EP85112163A EP85112163A EP0185858B1 EP 0185858 B1 EP0185858 B1 EP 0185858B1 EP 85112163 A EP85112163 A EP 85112163A EP 85112163 A EP85112163 A EP 85112163A EP 0185858 B1 EP0185858 B1 EP 0185858B1
Authority
EP
European Patent Office
Prior art keywords
oxygen
pulp
hydrogen peroxide
delignification
alkaline
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
EP85112163A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0185858A1 (de
Inventor
Horst Dr. Krüger
Hans-Ulrich Dr. Süss
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Priority to AT85112163T priority Critical patent/ATE33998T1/de
Publication of EP0185858A1 publication Critical patent/EP0185858A1/de
Application granted granted Critical
Publication of EP0185858B1 publication Critical patent/EP0185858B1/de
Expired 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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

Definitions

  • the invention relates to the alkaline delignification of sulfate pulps with oxygen, which is preceded by a treatment with oxygen and hydrogen peroxide in an acidic medium.
  • the object of the invention is a method for achieving a high degree of delignification by treating the pulp with oxygen while at the same time resulting in high strengths.
  • the invention relates to a two-stage process for the delignification of sulfate pulps produced under alkaline or neutral conditions with oxygen and hydrogen peroxide, characterized in that the pulp is pretreated at the same time as pH ⁇ 5 with oxygen and hydrogen peroxide and then further with oxygen in the alkaline medium delignified.
  • oxygen and hydrogen peroxide are only left for a short time, i.e. H. 60 to 60 minutes, preferably 4 to 30 minutes, act on the pulp in an acidic medium.
  • the oxygen delignification in the alkaline medium in the presence of NaOH as base is carried out according to the prior art at 90-120 ° C and an oxygen pressure of 0.1 to 0.5 MPa.
  • the switch between the acid pretreatment and the alkaline delignification with oxygen can be carried out by switching on a diffusion wash so that only slightly more steam and wash water is required.
  • the procedure without intermediate washing, in which more alkali is required to neutralize the acidic stage, on the other hand has the advantage of being able to consume both excess oxygen and hydrogen peroxide from the pretreatment stage in the further stage.
  • the steam requirement is then not increased compared to standard delignification.
  • the higher alkali requirement can be covered by causticized white liquor. Since the wastewater is returned to the oxygen stage, there is no overall higher chemical requirement.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • External Artificial Organs (AREA)
EP85112163A 1984-12-19 1985-09-25 Verfahren zur Delignifizierung von Sulfatzellstoffen Expired EP0185858B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85112163T ATE33998T1 (de) 1984-12-19 1985-09-25 Verfahren zur delignifizierung von sulfatzellstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3446301 1984-12-19
DE19843446301 DE3446301A1 (de) 1984-12-19 1984-12-19 Verfahren zur delignifizierung von sulfatzellstoffen

Publications (2)

Publication Number Publication Date
EP0185858A1 EP0185858A1 (de) 1986-07-02
EP0185858B1 true EP0185858B1 (de) 1988-05-04

Family

ID=6253194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85112163A Expired EP0185858B1 (de) 1984-12-19 1985-09-25 Verfahren zur Delignifizierung von Sulfatzellstoffen

Country Status (6)

Country Link
EP (1) EP0185858B1 (fi)
JP (1) JPS61146894A (fi)
AT (1) ATE33998T1 (fi)
DE (2) DE3446301A1 (fi)
FI (1) FI853492L (fi)
NO (1) NO853688L (fi)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0863251A1 (en) * 1997-03-04 1998-09-09 Oji Paper Co., Ltd. Process for producing bleached pulp
US5919238A (en) * 1998-03-04 1999-07-06 Ford Global Technologies, Inc. Method for aligning a vehicle suspension
US10243028B2 (en) 2014-04-08 2019-03-26 Panasonic Intellectual Property Management Co., Ltd. Organic electroluminescent element and lighting device with buffer layer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719552A (en) * 1971-06-18 1973-03-06 American Cyanamid Co Bleaching of lignocellulosic materials with oxygen in the presence of a peroxide
SE420430B (sv) * 1978-02-17 1981-10-05 Mo Och Domsjoe Ab Forfarande for blekning och extraktion av lignocellulosahaltig material med peroxidhaltiga blekmedel
US4372812A (en) * 1978-04-07 1983-02-08 International Paper Company Chlorine free process for bleaching lignocellulosic pulp
EP0088073A4 (en) * 1981-09-04 1984-01-09 Weyerhaeuser Co METHOD FOR TREATING PULP WITH MULTIPLE OXYGEN LEVELS.
DE3207157C1 (de) * 1982-02-27 1983-06-09 Degussa Ag, 6000 Frankfurt Verfahren zur Herstellung von halbgebleichten Zellstoffen

Also Published As

Publication number Publication date
DE3562496D1 (en) 1988-06-09
ATE33998T1 (de) 1988-05-15
FI853492A0 (fi) 1985-09-12
JPS61146894A (ja) 1986-07-04
EP0185858A1 (de) 1986-07-02
DE3446301A1 (de) 1986-06-19
FI853492L (fi) 1986-06-20
NO853688L (no) 1986-06-20

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