AT86756B - Process for the production of alkali cellulose. - Google Patents
Process for the production of alkali cellulose.Info
- Publication number
- AT86756B AT86756B AT86756DA AT86756B AT 86756 B AT86756 B AT 86756B AT 86756D A AT86756D A AT 86756DA AT 86756 B AT86756 B AT 86756B
- Authority
- AT
- Austria
- Prior art keywords
- alkali
- cellulose
- viscose
- production
- way
- Prior art date
Links
Landscapes
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Herstellung von Alkalizellulose.
Es ist bekannt,. dass bei der Herstellung von Viskose, die zur Erzeugung glänzender Fäden, Bänder, Films, Platten usw. dienen soll, die Behandlung der Zellulose mit Alkalilauge einer-der wichtigsten Teile des Prozesses ist. Eine schlecht mit Alkalilauge durchtränkte Zellulose ergibt mit ungelösten Zellulosefasern verunreigte Viskose. Die ungelösten, durch Alkali'gelatinierten Fasern erschweren das Filtrieren solcher Viskosen ausserordentlich, ja sie machen es sogar oft unmöglich. Unfiltrierte Viskosen lassen sich aber nicht in gewünschter Weise weiterverarbeiten, z. B. zu Fäden verspinnen.
Es wurde nun gefunden, dass die Ursache des schlechten Eindringens der Alkalilauge in die einzelnen Fasern und deren Zellen, die Luft ist, die ausserordentlich schwer durch Alkalilauge verdrängt wird. Deswegen wird in der Praxis die Zellulose längere Zeit, wie etwa i Stunden, mit der Alkalilauge behandelt.
Dieser grosse Übelstand wird der Erfindung gemäss, dadurch vollständig behoben, dass man die Zellulose vor der Behandlung mit Alkali möglichst luftfrei macht und-zweckmässig auch die Behandlung selbst unter vermindertem Druck ausführt.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for the production of alkali cellulose.
It is known,. that in the production of viscose, which is to be used to produce shiny threads, ribbons, films, plates, etc., the treatment of the cellulose with alkali is one of the most important parts of the process. Cellulose that is poorly saturated with alkali lye results in viscose contaminated with undissolved cellulose fibers. The undissolved fibers gelatinized by alkali make the filtration of such viscose extremely difficult, indeed they often even make it impossible. However, unfiltered viscose cannot be further processed in the desired manner, e.g. B. spin into threads.
It has now been found that the cause of the poor penetration of the alkali lye into the individual fibers and their cells is the air, which is extremely difficult to displace by the alkali lye. Therefore, in practice, the cellulose is treated with the alkali for a long time, such as 1 hour.
According to the invention, this major drawback is completely eliminated by making the cellulose as free from air as possible before the treatment with alkali and, expediently, also carrying out the treatment itself under reduced pressure.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86756T | 1920-01-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT86756B true AT86756B (en) | 1921-12-27 |
Family
ID=3607609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT86756D AT86756B (en) | 1920-01-30 | 1920-01-30 | Process for the production of alkali cellulose. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT86756B (en) |
-
1920
- 1920-01-30 AT AT86756D patent/AT86756B/en active
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