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US2193301A - Bleaching cellulose - Google Patents

Bleaching cellulose Download PDF

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Publication number
US2193301A
US2193301A US220116A US22011638A US2193301A US 2193301 A US2193301 A US 2193301A US 220116 A US220116 A US 220116A US 22011638 A US22011638 A US 22011638A US 2193301 A US2193301 A US 2193301A
Authority
US
United States
Prior art keywords
chlorine
jet apparatus
fibers
cellulose
bleaching
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 - Lifetime
Application number
US220116A
Other languages
English (en)
Inventor
Steinschneider Max
Knopf Erich
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.)
Aschaffenburger Zellstoffwerke AG
Original Assignee
Aschaffenburger Zellstoffwerke AG
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 Aschaffenburger Zellstoffwerke AG filed Critical Aschaffenburger Zellstoffwerke AG
Application granted granted Critical
Publication of US2193301A publication Critical patent/US2193301A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relates to a method of bleaching cellulosic fibers with chlorine and more particularly with chlorine gas.
  • the defect of known methods consists essentially in that it is not possible to dose the chicrine so accurately, in respect of its time of action on the fibers, and to bring it so intimately into contact with the fibers, at the moment of the reaction, as to prevent the cellulose itself from being also attacked. Losses of and injuries to the cellulose consequently result.
  • the fibers to be bleached e. g., wood pulp
  • a carrier liquid e. g., water
  • the concentration being from 1 to 3%
  • the amountoi chlorine gas required for the chlorination is drawn into the jet apparatus under the action of the resulting reduced pressure.
  • the chlorinated lignin is 6 removed by washing with water or dilute alkali.
  • a supply line 8 is connected at l to the jet apparatus for the chlorine gas which is drawn by'suctlon go into the jet apparatus.
  • the latter strictly speaking its diffusor, is containued by a pipe line 9.
  • the action of the chlorine gas drawn in by the jet apparatus on the fibers starts in the diffuser and in this pipe line 9.
  • tion chamber (not shown) may be connected to the line it.
  • the suspension may be forced into and through the jet apparatus by a different device or arrangement, instead of a pump.
  • chlorine- 30 containing liquids or other substances containing or yielding chlorine may be drawn in with the aid of the jet apparatus, instead of chlorinegas.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
US220116A 1937-07-23 1938-07-19 Bleaching cellulose Expired - Lifetime US2193301A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE841027X 1937-07-23
DEA772D DE948299C (de) 1937-07-23 1938-10-28 Verfahren und Vorrichtung zum Bleichen von Zellstoff

Publications (1)

Publication Number Publication Date
US2193301A true US2193301A (en) 1940-03-12

Family

ID=25760429

Family Applications (1)

Application Number Title Priority Date Filing Date
US220116A Expired - Lifetime US2193301A (en) 1937-07-23 1938-07-19 Bleaching cellulose

Country Status (4)

Country Link
US (1) US2193301A (de)
CH (2) CH208757A (de)
DE (1) DE948299C (de)
FR (2) FR841027A (de)

Also Published As

Publication number Publication date
CH208757A (de) 1940-02-29
FR841027A (fr) 1939-05-09
FR872300A (fr) 1942-06-05
CH215082A (de) 1941-05-31
DE948299C (de) 1956-08-30

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