DE548035C - Process for the production of a highly refined pentosan-free pulp - Google Patents

Process for the production of a highly refined pentosan-free pulp

Info

Publication number
DE548035C
DE548035C DEI39713D DEI0039713D DE548035C DE 548035 C DE548035 C DE 548035C DE I39713 D DEI39713 D DE I39713D DE I0039713 D DEI0039713 D DE I0039713D DE 548035 C DE548035 C DE 548035C
Authority
DE
Germany
Prior art keywords
pentosan
production
highly refined
free pulp
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
DEI39713D
Other languages
German (de)
Inventor
Dr-Ing G-A Feldtmann
Dr-Ing Otto Merlau
Dr Erich Opfermann
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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
Priority to DEI37423D priority Critical patent/DE539938C/en
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI39713D priority patent/DE548035C/en
Priority claimed from DEI39712D external-priority patent/DE546344C/en
Application granted granted Critical
Publication of DE548035C publication Critical patent/DE548035C/en
Expired legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00After-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
    • D21C9/08Removal 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
    • D21C9/083Removal 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)

Description

Verfahren zur Herstellung eines hochveredelten pentosanfreien Zellstoffes Im Hauptpatent 539 938 und im ersten Zusatzpatent 546 344 wird ein Verfahren zur Herstellung eines hochveredelten pentosanfreien Holzzellstoffes und zur Reinigung und Veredlung von nicht aus Holz gewonnenen pflaftzlichen Rohfasern aller Art beschrieben, bei welchem der Zellstoff oder Faserstoff zunächst bei Zimmertemperatur etwa. 3 Stunden lang mit einer ungefähr 5prozentigen Natronlauge digeriert, dann bis auf etwa t 5 1j" NaOH, berechnet auf das Stoffgewicht, von der Lauge befreit und unter Verdünnung mit Wasser oder Dampf einer Kochung unter Druck unterworfen wird.Process for the production of a highly refined pentosan-free pulp In the main patent 539 938 and in the first additional patent 546 344 a method for the production of a highly refined pentosan-free wood pulp and for the cleaning and refinement of non-wood-derived vegetable raw fibers of all kinds is described, in which the pulp or fiber initially at Room temperature approx. Digested for 3 hours with an approximately 5% sodium hydroxide solution, then up to about 5% NaOH, calculated on the weight of the material, is freed from the lye and subjected to boiling under pressure while being diluted with water or steam.

Es wurde gefunden, daß diese Kochung vorteilhaft mit milder wirkenden Basen als Natronlauge durchgeführt wird, da zahlreiche Faserstoffe bei höheren Temperaturen gegen Natronlauge sehr empfindlich sind.It has been found that this cooking is beneficial with milder-acting Bases than caustic soda is carried out, as numerous fibers at higher temperatures are very sensitive to caustic soda.

Die Nachkochung von Zellstoffen mit den milder wirkenden Hvdroxvden der Erdalkalien oder des Magnesiums zum Zwecke der Veredlung an Stelle von Alkalien ist zwar an sich bekannt. Aber noch viel weniger als Natronlauge allein können diese im Gegensatz zu den Alkalien wegen ihrer schlechteren Löslichkeit sehr schwachen Basen bei der Erhitzung mit oder ohne Druck die Inkrusten und besonders das Pentosan so weitgehend herauslösen, wie es zu den gedachten Zwecken, z. B. für die Herstellung hochwertiger Kunstseidezellstoffe, notwendig ist. Erst wenn man der Druckkochung mit den Basen der alkalischen Erden und des Magnesiums eine kalte Vorbehandlung mit Natronlauge vorhergehen läßt, erhält man eine befriedigende Reinigung und Befreiung der Faserstoffe von Pentosan.The reboiling of cellulose with the milder Hvdroxvden alkaline earths or magnesium for the purpose of refinement instead of alkalis is known per se. But they can do much less than caustic soda alone in contrast to alkalis, they are very weak because of their poor solubility When heated, with or without pressure, bases the incrustations and especially the pentosan dissolve as much as it is necessary for the intended purposes, e.g. B. for manufacturing high quality rayon pulp is necessary. Only when you get the pressure cooker a cold pretreatment with the bases of the alkaline earths and magnesium Let it precede with sodium hydroxide solution, you get a satisfactory cleaning and liberation of the fibers of pentosan.

Erfindungsgemäß wird diese Verbindung von Vorbehandlung mit kalter Natronlauge und Nachkochung mit den Basen der alkalischen Erden oder des Magnesiums vorteilhaft dadurch erreicht, daß man die nach der Vorbehandlung mit Natronlauge und dem Abschleudern oder Abpressen im Stoff verbleibende Menge Natronlauge ganz oder teilweise durch Zusatz von Chloriden der alkalischen Erden oder des Magnesiums zu den entsprechenden Basen umsetzt und dadurch eine mehr oder weniger gepufferte Kochflüssigkeit erhält. Dies hat im Gegensatz zu einer naheliegenden Abstumpfung- der Kochlauge mit C02, S02 oder ähnlichen Säuren den Vorteil, daB die Hydroxylionenkonzentration zwar sinkt, aber die zur Verfügung stehende Menge an Hydroxylgruppen nicht verringert wird. Beispiele i. ioo kg lufttrockener ungebleichter, gut bleichfähiger Zellstoff werden 3 Stunden lang mit der zwanzigfachen Menge einer q.- bis 6prozentigen Natronlauge bei Zimmertemperatur digeriert, dann wird so weit abgeschleudert, daß der Stoff noch i 5 °1a N a OH, berechnet auf das Stoffgewicht, enthält. Dieses Gemisch wird in einen Kocher eingetragen und mit Wasser, welches _10,4 kg wasserfreies Calciumchlorid gelöst enthält, verdünnt. Durch diesen Zusatz von Calciumchlorid wird die Hälfte des im Stoff vorhandenen Ätznatrons zu Ca (O H)2 umgesetzt. Man kocht Stunden bis zur Erreichung einer Tem. peratur von r35° und hält diese Temperatur 2 Stunden lang aufrecht. Dann wird die Lauge entfernt und der Stoff in der üblichen Weise warm ausgewaschen, gebleicht und ges äuert.According to the invention, this combination of pretreatment with cold Sodium hydroxide solution and boiling with the bases of the alkaline earths or magnesium advantageously achieved by the fact that after the pretreatment with sodium hydroxide solution and spinning off or squeezing off the entire amount of caustic soda remaining in the fabric or partly by adding chlorides of the alkaline earths or of magnesium converts to the corresponding bases and thereby one more Or less receives buffered cooking liquid. This has in contrast to an obvious one Dulling the cooking liquor with C02, S02 or similar acids has the advantage that the Hydroxyl ion concentration decreases, but the amount available decreases Hydroxyl groups are not decreased. Examples i. ioo kg air-dry unbleached, pulp that can be easily bleached for 3 hours with twenty times the amount of a q.- to 6% caustic soda is digested at room temperature, then it gets so far thrown off, that the substance is still i 5 ° 1a N a OH, calculated on the weight of the substance, contains. This mixture is introduced into a cooker and mixed with water, which _ 10.4 kg of anhydrous calcium chloride in dissolved form, diluted. With this addition calcium chloride converts half of the caustic soda in the fabric to Ca (O H) 2 implemented. You cook for hours until a temp is reached. temperature of r35 ° and maintains this temperature for 2 hours. Then the lye is removed and the fabric is washed warm, bleached and acidified in the usual way.

2. ioo kg Hullfasern werden nach Beispiel i behandelt.2. 100 kg of Hull fibers are treated according to example i.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines hochveredelten pentosanfreien Holzzellstoffes oder pflanzlichen Rohfaserstoffes nach Patent 539 938, dadurch gekennzeichnet, daB die nach dem Abschleudern oder Abpressen im Stoff verbleibende Menge Natronlauge vor der Kochung ganz oder teilweise durch Zusatz von Chloriden der alkalischen Erden oder des Magnesiums zu den entsprechenden Basen umgesetzt wird. PATENT CLAIM: Process for the production of a highly refined pentosan-free wood pulp or vegetable raw fiber material according to patent 539 938, characterized in that the amount of caustic soda remaining in the material after being thrown off or pressed is wholly or partially by adding chlorides of the alkaline earths or magnesium to the appropriate bases is implemented.
DEI39713D 1929-03-13 1929-11-03 Process for the production of a highly refined pentosan-free pulp Expired DE548035C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEI37423D DE539938C (en) 1929-03-13 1929-03-13 Process for the production of a highly refined, pentosan-free wood pulp
DEI39713D DE548035C (en) 1929-03-13 1929-11-03 Process for the production of a highly refined pentosan-free pulp

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEI37423D DE539938C (en) 1929-03-13 1929-03-13 Process for the production of a highly refined, pentosan-free wood pulp
DEI39712D DE546344C (en) 1929-03-13 1929-11-03 Process for the production of a highly refined, pentosan-free pulp
DEI39713D DE548035C (en) 1929-03-13 1929-11-03 Process for the production of a highly refined pentosan-free pulp

Publications (1)

Publication Number Publication Date
DE548035C true DE548035C (en) 1932-04-08

Family

ID=32966001

Family Applications (2)

Application Number Title Priority Date Filing Date
DEI37423D Expired DE539938C (en) 1929-03-13 1929-03-13 Process for the production of a highly refined, pentosan-free wood pulp
DEI39713D Expired DE548035C (en) 1929-03-13 1929-11-03 Process for the production of a highly refined pentosan-free pulp

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DEI37423D Expired DE539938C (en) 1929-03-13 1929-03-13 Process for the production of a highly refined, pentosan-free wood pulp

Country Status (1)

Country Link
DE (2) DE539938C (en)

Also Published As

Publication number Publication date
DE539938C (en) 1931-12-05

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