DE539401C - Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp - Google Patents

Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp

Info

Publication number
DE539401C
DE539401C DEZ17939D DEZ0017939D DE539401C DE 539401 C DE539401 C DE 539401C DE Z17939 D DEZ17939 D DE Z17939D DE Z0017939 D DEZ0017939 D DE Z0017939D DE 539401 C DE539401 C DE 539401C
Authority
DE
Germany
Prior art keywords
cellulose
production
further processing
high quality
wood pulp
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
DEZ17939D
Other languages
German (de)
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.)
ARNOLD BERNSTEIN DR
Zellsloff Fabrik Waldhof AG
Original Assignee
ARNOLD BERNSTEIN DR
Zellsloff Fabrik Waldhof 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 ARNOLD BERNSTEIN DR, Zellsloff Fabrik Waldhof AG filed Critical ARNOLD BERNSTEIN DR
Priority to DEZ17939D priority Critical patent/DE539401C/en
Priority claimed from GB2324529A external-priority patent/GB337445A/en
Application granted granted Critical
Publication of DE539401C publication Critical patent/DE539401C/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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
    • C08B1/02—Rendering cellulose suitable for esterification

Description

Verfahren zur Herstellung hochwertiger Cellulose für die Weiterverarbeitung auf Celluloseester, Kunstseide u. dgl. aus Holzzellstoff Bei weiteren Versuchen zur Behandlung von Zellstoff gemäß Patent 537 846 hat sich gezeigt, daß auch bei Anwendung verdünnterer Lösungen von Ätz- oder kohlensauren Alkalien, welche weniger als 5 0;o Alkali enthalten, Stoffe von verhältnismäßig hohem Gehalt an reiner Cellulose erhalten werden können. Wenn man bei Anwendung dieser niedrigeren Konzentrationen auch naturgemäß nicht den hohen Reincellulosegehalt wie nach dem Verfahren des Hauptpatentes erzielt, so bedeutet doch die nach dem neuen Verfahren mit verhältnismäßig einfachen Mitteln erreichte Erhöhung des Reincellulosegehaltes auf mindestens 9o % einen wesentlichen. Fortschritt gegenüber bekannten Verfahren. Die Behandlung wird zweckmäßig in nicht zu hoher Stoffkonzentration vorgenommen, worauf man eine gründliche Nachwaschung, am besten zunächst mit verdünnter alkalischer Waschflüssigkeit, folgen läßt. Man kann beispielsweise wie folgt verfahren: i oo kg vorgebleichter Zellstoff werden mit i 5oo kg 2, 5 %iger Natronlauge, welcher vorher ioo 1 Chlorlauge mit etwa 2o g wirksamem Chlor im Liter beigemischt werden, etwa i Stunde unter Bewegung bei gewöhnlicher Temperatur behandelt. Die Behandlungsflüssigkeit läßt man ablaufen und wäscht gründlich mit verdünnter Natronlauge und im Anschluß daran mit Wasser nach. Zum Schluß wird abgesäuert und wieder gründlich gewaschen.Process for the production of high quality cellulose for further processing on cellulose ester, rayon and the like made of wood pulp In further experiments for the treatment of pulp according to patent 537 846 it has been shown that also in Use of more dilute solutions of caustic or carbonic acid alkalis, which less contain more than 50; o alkali, substances with a relatively high content of pure cellulose can be obtained. If you are using these lower concentrations also naturally not the high pure cellulose content as in the process of the main patent achieved, it means that according to the new method with relatively simple A substantial increase in the pure cellulose content to at least 90% was achieved. Advancement over known processes. The treatment becomes expedient in not too high a concentration of the substance, whereupon a thorough post-wash, best to follow with a dilute alkaline washing liquid first. Man can, for example, proceed as follows: 100 kg of pre-bleached pulp are used with 1500 kg of 2.5% strength sodium hydroxide solution, which was previously 100 l of sodium hydroxide solution with about 2o g of effective chlorine per liter can be added for about an hour with agitation ordinary temperature treated. The treatment liquid is allowed to run off and washes thoroughly with dilute sodium hydroxide solution and then with water after. Finally, it is acidified and washed again thoroughly.

Claims (2)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung hochwertiger Cellulose für die Weiterverarbeitung auf Celluloseester, Kunstseide. u. dgl. aus Holzzellstoff gemäß Patent 537 846, dadurch gekennzeichnet, daß Zellstoff ungebleicht oder gebleicht mit Lösungen von Ätz- oder kohlensauren Alkalien (bzw. Gemischen derselben), welche weniger als 5 % Alkali enthalten, in Gegenwart eines oxydierenden Bleichmittels behandelt und im Anschluß daran gewaschen wird. PATENT CLAIMS: i. Process for the production of high quality cellulose for further processing on cellulose ester, rayon. and the like made of wood pulp according to patent 537 846, characterized in that pulp is unbleached or bleached with solutions of caustic or carbonic acid alkalis (or mixtures thereof), which Contains less than 5% alkali, in the presence of an oxidizing bleach treated and then washed. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Auswaschung zunächst mit Alkali- oder Carbonatlauge und im Anschluß daran mit Wasser durchgeführt wird.2. The method according to claim i, characterized characterized in that the leaching is first carried out with alkali or carbonate liquor and is then carried out with water.
DEZ17939D 1928-11-03 1928-11-03 Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp Expired DE539401C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEZ17939D DE539401C (en) 1928-11-03 1928-11-03 Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEZ17939D DE539401C (en) 1928-11-03 1928-11-03 Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp
GB2324529A GB337445A (en) 1929-07-29 1929-07-29 Improvements in or relating to the treatment of wood cellulose

Publications (1)

Publication Number Publication Date
DE539401C true DE539401C (en) 1931-11-25

Family

ID=26003700

Family Applications (1)

Application Number Title Priority Date Filing Date
DEZ17939D Expired DE539401C (en) 1928-11-03 1928-11-03 Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp

Country Status (1)

Country Link
DE (1) DE539401C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972448C (en) * 1950-02-22 1959-07-23 Mo Och Domsjoe Ab Process for the aftertreatment of cellulose material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972448C (en) * 1950-02-22 1959-07-23 Mo Och Domsjoe Ab Process for the aftertreatment of cellulose material

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