SE311109B - - Google Patents

Info

Publication number
SE311109B
SE311109B SE1643767A SE1643767A SE311109B SE 311109 B SE311109 B SE 311109B SE 1643767 A SE1643767 A SE 1643767A SE 1643767 A SE1643767 A SE 1643767A SE 311109 B SE311109 B SE 311109B
Authority
SE
Sweden
Prior art keywords
pulp
chlorine
tower
bleaching
tube
Prior art date
Application number
SE1643767A
Inventor
S Goeransson
Original Assignee
Billeruds 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 Billeruds Ab filed Critical Billeruds Ab
Priority to SE1643767A priority Critical patent/SE311109B/xx
Priority to GB5358368A priority patent/GB1164590A/en
Priority to DE19681810704 priority patent/DE1810704C3/en
Priority to FR1593422D priority patent/FR1593422A/fr
Publication of SE311109B publication Critical patent/SE311109B/xx

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
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
    • D21C9/083—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching with inorganic compounds
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

1,164,590. Bleaching pulp. BILLERUDS A.B. 12 Nov., 1968 {30 Nov., 1967], No. 53583/68. Heading D1P. Unbleached wood pulp for use in the production of rayon pulp is bleached by subjecting the pulp to an incomplete bleaching with elementary chlorine to leave a residue of lignin in the pulp and removing the residual lignin by bleaching the pulp with chlorine dioxide or a hypochlorite, e.g. sodium or calcium hypochlorite. The incomplete bleaching with chlorine preferably leaves a residual content of lignin in the pulp of 0.1-0.2% by weight. The chlorine may be added to the pulp in the exact quantity required for delignifying the pulp while leaving 0.1-0.2% by weight of lignin in the pulp or the chlorine may be added in a quantity higher than that required for complete delignification and the excess chlorine removed, e.g. by washing the pulp with water and/or adding an alkali to the pulp, while there is still a small quantity of lignin present in the pulp. If chlorine dioxide is the secondary bleaching agent this can be added to the pulp together with the elementary chlorine, the ligrain being mainly attacked by the chlorine and when all the chlorine has been consumed the residual lignin being attacked by the chlorine dioxide, but if a hypochlorite is used as the secondary bleaching agent this must be applied after the treatment with elementary chlorine. The natural resin in the bleached pulp may be chlorinated to less than 12% by weight, defined as the percentage of chlorine of the solid resinous material soluble in ethanol. Suitable bleaching apparatus comprises a first bleaching tower 1, alkalization tower 3 and second and third bleaching towers 5 and 7, washers 2, 4, 6 and 8 being supplied after each tower and water supplied to the washers through tubes 9 being withdrawn through tubes 10. Unbleached pulp is supplied to tower 1 through tube 11 and bleached pulp withdrawn through tube 12. For controlling the processes in the towers samples can be taken through tubes 17, 18, 19 and 20. Chlorine, or chlorine and chlorine dioxide, is supplied to tower 1 through tube 13, sodium hydroxide is supplied to tower 3 through tube 14, hypochlorite is supplied to tower 5 through tube 15 and hypochlorite or chlorine dioxide is supplied to tower 7 through tube 16. The temperature in tower 3 may be 40‹-100‹C and in towers 5 and 7 40‹-60‹C. If it is not desired to wash the pulp between towers 5 and 7 the washer 6 may be shunted by tube 21.
SE1643767A 1967-11-30 1967-11-30 SE311109B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE1643767A SE311109B (en) 1967-11-30 1967-11-30
GB5358368A GB1164590A (en) 1967-11-30 1968-11-12 Method for producing Viscose Pulp having good Filterability and Low Tendency of Clogging the Spinning Nozzles
DE19681810704 DE1810704C3 (en) 1967-11-30 1968-11-25 Process for bleaching wood pulp for the manufacture of rayon pulp
FR1593422D FR1593422A (en) 1967-11-30 1968-11-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1643767A SE311109B (en) 1967-11-30 1967-11-30

Publications (1)

Publication Number Publication Date
SE311109B true SE311109B (en) 1969-05-27

Family

ID=20302240

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1643767A SE311109B (en) 1967-11-30 1967-11-30

Country Status (4)

Country Link
DE (1) DE1810704C3 (en)
FR (1) FR1593422A (en)
GB (1) GB1164590A (en)
SE (1) SE311109B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE389351B (en) * 1975-03-14 1976-11-01 Kamyr Ab METHOD AND DEVICE FOR DISTRIBUTION AND MIXTURE OF GAS AND / OR LIQUID IN MASS CONCENTRATIONS OF HIGH CONCENTRATION.

Also Published As

Publication number Publication date
GB1164590A (en) 1969-09-17
DE1810704A1 (en) 1969-09-04
DE1810704C3 (en) 1974-02-28
FR1593422A (en) 1970-05-25
DE1810704B2 (en) 1973-07-19

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