GB462871A - Improvements in or relating to the refining of wood pulp - Google Patents

Improvements in or relating to the refining of wood pulp

Info

Publication number
GB462871A
GB462871A GB1320936A GB1320936A GB462871A GB 462871 A GB462871 A GB 462871A GB 1320936 A GB1320936 A GB 1320936A GB 1320936 A GB1320936 A GB 1320936A GB 462871 A GB462871 A GB 462871A
Authority
GB
United Kingdom
Prior art keywords
per cent
pulp
cao
chlorine
water
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
GB1320936A
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.)
International Paper Canada Inc
Original Assignee
International Paper Canada Inc
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 International Paper Canada Inc filed Critical International Paper Canada Inc
Priority to GB1320936A priority Critical patent/GB462871A/en
Priority to NL77801A priority patent/NL45057C/xx
Priority to FR806539D priority patent/FR806539A/en
Priority to BE415619D priority patent/BE415619A/xx
Priority to CH190734D priority patent/CH190734A/en
Publication of GB462871A publication Critical patent/GB462871A/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
    • D21C9/08—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

Landscapes

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

Abstract

A method of refining wood pulp, for use in the manufacture of rayon or as filler for moulded articles, comprises treating the pulp in aqueous suspension with chlorine in the presence of an alkali metal chloride, and washing the pulp with soft water. The chlorination may be an essential step in a bleaching operation, e.g. when operating on unbleached sulphite pulp. The treatment has the effect of reducing the alkaline earth content of the pulp which after treatment contains less than 0,025 per cent CaO and less than 0,005 per cent MgO. The reaction is preferably carried out at high density, e.g. 5 per cent. The temperature need not exceed 40 DEG C. and the reaction is normally not longer than 30--90 minutes. In an example, unbleached pulp containing 0,15 per cent CaO is treated for one hour at 20 DEG C. and a density of 3,5 per cent with 2 per cent gaseous chlorine and 2,5 per cent sodium chloride calculated on the fibre weight. The pulp is then washed with water substantially free from lime and contains not more than 0,01 per cent CaO. In a second example, a bleached pulp containing 0,08 per cent CaO and 0,02 per cent MgO is treated at 5 per cent density for \ba1/2\be hour with 0,75 per cent C12 and 1,5 per cent potassium chloride calculated on the fibre weight. The chlorine is added as chlorine water containing 4 grams C12/litre. The pulp is then washed with water free from calcium or magnesium and contains 0,01 per cent CaO and is practically free from magnesium.
GB1320936A 1936-05-09 1936-05-09 Improvements in or relating to the refining of wood pulp Expired GB462871A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB1320936A GB462871A (en) 1936-05-09 1936-05-09 Improvements in or relating to the refining of wood pulp
NL77801A NL45057C (en) 1936-05-09 1936-05-14
FR806539D FR806539A (en) 1936-05-09 1936-05-16 Improvements relating to the refining of cellulosic materials, such as wood pulp
BE415619D BE415619A (en) 1936-05-09 1936-05-19
CH190734D CH190734A (en) 1936-05-09 1936-05-30 Process for cleaning wood pulp.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1320936A GB462871A (en) 1936-05-09 1936-05-09 Improvements in or relating to the refining of wood pulp

Publications (1)

Publication Number Publication Date
GB462871A true GB462871A (en) 1937-03-17

Family

ID=10018815

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1320936A Expired GB462871A (en) 1936-05-09 1936-05-09 Improvements in or relating to the refining of wood pulp

Country Status (5)

Country Link
BE (1) BE415619A (en)
CH (1) CH190734A (en)
FR (1) FR806539A (en)
GB (1) GB462871A (en)
NL (1) NL45057C (en)

Also Published As

Publication number Publication date
FR806539A (en) 1936-12-18
BE415619A (en) 1936-06-30
CH190734A (en) 1937-05-15
NL45057C (en) 1939-02-17

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