DE825399C - Process for accelerating the ripening of alkali cellulose - Google Patents

Process for accelerating the ripening of alkali cellulose

Info

Publication number
DE825399C
DE825399C DEF2375A DEF0002375A DE825399C DE 825399 C DE825399 C DE 825399C DE F2375 A DEF2375 A DE F2375A DE F0002375 A DEF0002375 A DE F0002375A DE 825399 C DE825399 C DE 825399C
Authority
DE
Germany
Prior art keywords
ripening
alkali cellulose
accelerating
alkali
iron
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
DEF2375A
Other languages
German (de)
Inventor
Dr Gustav Adolf Schroeter
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.)
Feldmuehle AG
Feldmuehle Papier und Zellstoffwerke AG
Original Assignee
Feldmuehle AG
Feldmuehle Papier und 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 Feldmuehle AG, Feldmuehle Papier und Zellstoffwerke AG filed Critical Feldmuehle AG
Priority to DEF2375A priority Critical patent/DE825399C/en
Application granted granted Critical
Publication of DE825399C publication Critical patent/DE825399C/en
Expired legal-status Critical Current

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Classifications

    • 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
    • C08B1/08—Alkali cellulose

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)

Description

Verfahren zur Beschleunigung der Reifung von Alkalicellulose Bei der Herstellung von Viskose ist es bekannt, daß die Reifung der für die Xanthogenierung angewandten Alkalicellulose dadurch beschleunigt werden kann, 4aß man die Cellulose vor der Alkalibehandlung in eine Metallsalzlösung, z. B. in eine Lösung von Eisensulfat oder Nickelsulfat, taucht.Process for accelerating the ripening of alkali cellulose In the Production of viscose it is known that the ripening is necessary for xanthogenation applied alkali cellulose can be accelerated by 4assing the cellulose before alkali treatment in a metal salt solution, e.g. B. in a solution of iron sulfate or nickel sulfate, dips.

Die Erfindung bezweckt, für die katalytische Reifebeschleulligung durch Aletallverbindungen den Tauchprozeß in eine Metalisalzlösung und die hieran anschließende Trocknung entbehrlich zu machen, und erreicht den Zweck durch Ubergasen der Alkalicellulose mit einem flüchtigen Metallcarl>onyl, vorzugsweise mit Eisencarbonyl. The invention aims for catalytic ripening by Aletallverbindungen the immersion process in a metal salt solution and this making subsequent drying unnecessary, and achieves the purpose by overgas the alkali cellulose with a volatile metal carbonyl, preferably with iron carbonyl.

Beispiel Technische Akalicellulose, welche sich in einem gläsernen Lahoratoriumstrockenturm von 6 cm befand, wurde 8 Minuten mit einem eisencarbonylbeladenen Luftstrom bei eiller Strömungsgeschwindigkeit von 2 1 in der Minute begast. Dem Luftstrom wurden pro Minute 60 ccm Zusatzluft hinzugefügt, welche durch eine 3 cm hohe Eisenpentacarhonylschicht perlte. Der Eisengehalt der Alkalicellulose stieg hierdurch von 4 mg für IOO g Zellstoff auf 34 mg. Die behandelt und die unbehandelte Alkalicellulose wurden im Thermostaten bei 400 gereift. Die aus den Alkalicellulosen isolierten Cellulosen zeigten die im folgenden angegebenen relativen Viskositäten (Papierfabrikant 1937, Techn. Teil, S. II9). Example Technical Akalicellulose, which is in a glass Lahoratorium drying tower of 6 cm, was 8 minutes with an iron carbonyl-laden Air flow gassed at a flow rate of 2 liters per minute. To the Air flow were added 60 ccm of additional air per minute, which was passed through a 3 cm high layer of iron pentacarhonyl pearled. The iron content of the alkali cellulose increased thereby from 4 mg for 100 g of pulp to 34 mg. The treated and the untreated Alkali celluloses were thermostatically ripened at 400. The ones from the alkali celluloses isolated Celluloses showed the relative values given below Viscosities (paper manufacturer 1937, technical part, p. II9).

Ausgangsstoff: 9,o7 unbehandelt mit Carbonyl begast nach 2h bei 400 gereift: 6,35 4,5 nach 4h bei 400 gereift: 5,0 3,2 Durch die beschriebene Eisenpentacarbonylbegasung ist also eine so°/oige Zeitersparnis erzielt.Starting material: 9, o7 untreated with carbonyl gassed after 2h at 400 matured: 6.35 4.5 after 4h at 400 matured: 5.0 3.2 by the iron pentacarbonyl gassing described thus, such a% time saving is achieved.

Die beschriebene Anwendungsart von Metallcarbonylen kann in mannigfacher, den jeweilig einzusetzenden Apparaturen und Verfahren angepaßter Weise variiert werden. Sie soll sich nicht nur auf den Viskoseprozeß beschränken, sondern sinngemäß bei allen Verfahren Anwendung finden, bei welchen ein Reifen von Allialicellulose vorgenommen wird. The type of application of metal carbonyls described can be used in various varies in a manner adapted to the particular apparatus and process to be used will. It should not be limited to the viscose process, but analogously find use in all processes in which a ripening of allialicellulose is made.

Claims (1)

PATENTANSPRUCI{ Verfahren zur Beschleunigung der Reifung von Alkalicellulose durch Einführung von Metallverbindungen, dadurch gekennzeichnet, daß die Alkalicellulose mit Metallcarbonylen vorzugsweise Eisenpentacarhonyl, begast wird. PATENTANSPRUCI {Process for accelerating the ripening of alkali cellulose by introducing metal compounds, characterized in that the alkali cellulose with metal carbonyls, preferably iron pentacarhonyl, is gassed.
DEF2375A 1943-04-04 1943-04-04 Process for accelerating the ripening of alkali cellulose Expired DE825399C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF2375A DE825399C (en) 1943-04-04 1943-04-04 Process for accelerating the ripening of alkali cellulose

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF2375A DE825399C (en) 1943-04-04 1943-04-04 Process for accelerating the ripening of alkali cellulose

Publications (1)

Publication Number Publication Date
DE825399C true DE825399C (en) 1951-12-17

Family

ID=7083249

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF2375A Expired DE825399C (en) 1943-04-04 1943-04-04 Process for accelerating the ripening of alkali cellulose

Country Status (1)

Country Link
DE (1) DE825399C (en)

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