GB373594A - A new or improved process for freeing fibrous material from incrusting substances - Google Patents

A new or improved process for freeing fibrous material from incrusting substances

Info

Publication number
GB373594A
GB373594A GB35098/30A GB3509830A GB373594A GB 373594 A GB373594 A GB 373594A GB 35098/30 A GB35098/30 A GB 35098/30A GB 3509830 A GB3509830 A GB 3509830A GB 373594 A GB373594 A GB 373594A
Authority
GB
United Kingdom
Prior art keywords
added
glatz
alkali
bleaching
weak
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
GB35098/30A
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.)
ERWIN GLATZ
Original Assignee
ERWIN GLATZ
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 ERWIN GLATZ filed Critical ERWIN GLATZ
Publication of GB373594A publication Critical patent/GB373594A/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds

Landscapes

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

Abstract

373,594. Retting. GLATZ, E., GLATZ, A., and GLATZ, E., (trading as GLATZ, J.), Niedenfels, Rheinpfalz, Germany. Nov. 21, 1930, No. 35098. Convention date, Jan. 8. Void [Published under Sect. 91 of the Acts]. [Class 120 (i).] Incrusting substances are separated from fibres by first treating with an alkali bleaching lye with or without resin dissolving substances and swelling media, and then adding dilute acid with constant pH measurement until a weak acid reaction is given and the chlorine so freed from the bleaching lye has converted the remaining lignin into the water or alkalisoluble form. The fibres may advantageously be subsequently treated with weak alkali and a bleaching agent. In an example, air dried fibre is placed in a Hollander with water and heated to 25-30‹ C. Sufficient sodium hypochlorite is added to convert all the lignin into the alkali-soluble form. After half an hour dilute acid is added until the pH value is 1-2, and the mass allowed to stand for one hour. The calculated quantity of dilute caustic soda to give an alkali content of 2 per cent is added, the whole allowed to stand for another hour, and the material finally washed. If the material has a weak bleaching capacity, half the chlorine may be added, a pH value of 1-2 obtained as above, the second half added, and the process repeated.
GB35098/30A 1930-01-08 1930-11-21 A new or improved process for freeing fibrous material from incrusting substances Expired GB373594A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE373594X 1930-01-08

Publications (1)

Publication Number Publication Date
GB373594A true GB373594A (en) 1932-05-26

Family

ID=6338960

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35098/30A Expired GB373594A (en) 1930-01-08 1930-11-21 A new or improved process for freeing fibrous material from incrusting substances

Country Status (2)

Country Link
BE (1) BE375578A (en)
GB (1) GB373594A (en)

Also Published As

Publication number Publication date
BE375578A (en)

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