DE3367421D1 - Process for bleaching raw paper materials - Google Patents

Process for bleaching raw paper materials

Info

Publication number
DE3367421D1
DE3367421D1 DE8383112505T DE3367421T DE3367421D1 DE 3367421 D1 DE3367421 D1 DE 3367421D1 DE 8383112505 T DE8383112505 T DE 8383112505T DE 3367421 T DE3367421 T DE 3367421T DE 3367421 D1 DE3367421 D1 DE 3367421D1
Authority
DE
Germany
Prior art keywords
raw paper
paper materials
bleaching
bleaching raw
termination
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
DE8383112505T
Other languages
German (de)
Inventor
Hans-Ulrich Dr Suss
Horst Dr Kruger
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 DE8383112505T priority Critical patent/DE3367421D1/en
Application granted granted Critical
Publication of DE3367421D1 publication Critical patent/DE3367421D1/en
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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds

Landscapes

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

Abstract

1. A process for the bleaching of raw paper materials with formamidine sulphinic acid at a temperature of from 50 to 130 degrees C, a pulp density of from 2 to 20 % by weight and a residence time of from 1 to 120 minutes in an alkaline aqueous sludge, characterized in that the pH lies between 9.7 and 12 at the beginning of the bleaching reaction and between 7 and < 9 after termination.
DE8383112505T 1983-03-19 1983-12-13 Process for bleaching raw paper materials Expired DE3367421D1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8383112505T DE3367421D1 (en) 1983-03-19 1983-12-13 Process for bleaching raw paper materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3309956A DE3309956C1 (en) 1983-03-19 1983-03-19 Process for bleaching paper raw materials
DE8383112505T DE3367421D1 (en) 1983-03-19 1983-12-13 Process for bleaching raw paper materials

Publications (1)

Publication Number Publication Date
DE3367421D1 true DE3367421D1 (en) 1986-12-11

Family

ID=6194000

Family Applications (2)

Application Number Title Priority Date Filing Date
DE3309956A Expired DE3309956C1 (en) 1983-03-19 1983-03-19 Process for bleaching paper raw materials
DE8383112505T Expired DE3367421D1 (en) 1983-03-19 1983-12-13 Process for bleaching raw paper materials

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE3309956A Expired DE3309956C1 (en) 1983-03-19 1983-03-19 Process for bleaching paper raw materials

Country Status (3)

Country Link
EP (1) EP0120132B1 (en)
AT (1) ATE23376T1 (en)
DE (2) DE3309956C1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616816A1 (en) * 1986-05-17 1987-11-19 Degussa METHOD FOR REMOVING BULK COLORED PAPER AND SELF-COPYING PAPER
DE3831668A1 (en) * 1988-09-17 1990-03-22 Escher Wyss Gmbh METHOD FOR INCREASING WHITE GRADE OF WASTE PAPER WITH NEUTRAL WATER CIRCUIT
DE3902423A1 (en) * 1989-01-27 1990-08-02 Degussa METHOD FOR BLEACHING FIBER FABRICS FOR PAPER PRODUCTION
GB9214041D0 (en) * 1992-07-02 1992-08-12 Morton Int Inc Process for de-inking recycled paper pulp
AT407762B (en) * 1994-03-22 2001-06-25 Brueggemann L Kg Bleaching agent for bleaching secondary fibrous materials for papermaking
DE19920338A1 (en) * 1999-05-03 2000-11-16 Voith Sulzer Papiertech Patent Bleaching control of a paper fiber pulp suspension uses measurements before and after bleaching with intermediate measurements to control the bleaching stage for optimum whiteness and max use of the bleaching chemicals
DE102007007654A1 (en) * 2007-02-13 2008-08-14 Voith Patent Gmbh FAS bleach
US10974348B2 (en) 2016-06-02 2021-04-13 Priefert Mfg. Co, Inc. Method for forming a brazed joint
DE102020111675A1 (en) * 2020-04-29 2021-11-04 Kübler & Niethammer Papierfabrik Kriebstein AG Process for producing a label paper from detached wet labels

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3384534A (en) * 1964-12-16 1968-05-21 Fmc Corp Bleaching of wood pulps with thiourea dioxide
GB1404315A (en) * 1971-09-15 1975-08-28 Albright & Wilson Production of bleached high yield pulp
DE3118192A1 (en) * 1981-05-08 1982-11-25 Basf Ag, 6700 Ludwigshafen Process for de-inking waste paper

Also Published As

Publication number Publication date
DE3309956C1 (en) 1984-07-12
EP0120132A1 (en) 1984-10-03
EP0120132B1 (en) 1986-11-05
ATE23376T1 (en) 1986-11-15

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: DEGUSSA-HUELS AG, 60311 FRANKFURT, DE

8339 Ceased/non-payment of the annual fee