DE524185C - Process for drying cellulose using liquid sulphurous acid - Google Patents
Process for drying cellulose using liquid sulphurous acidInfo
- Publication number
- DE524185C DE524185C DED58518D DED0058518D DE524185C DE 524185 C DE524185 C DE 524185C DE D58518 D DED58518 D DE D58518D DE D0058518 D DED0058518 D DE D0058518D DE 524185 C DE524185 C DE 524185C
- Authority
- DE
- Germany
- Prior art keywords
- cellulose
- sulphurous acid
- liquid
- drying
- drying cellulose
- 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
Links
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
- C08B1/02—Rendering cellulose suitable for esterification
Landscapes
- 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)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
Verfahren zum Trocknen von Cellulose mittels flüssiger schwefliger Säure Die Trocknung von Cellulose erfolgt allgemein durch Verdunsten des Wassers durch Wärme. je nach Charakter und Herkommen erleiden Cellulosen durch Wärme eine mehr oder weniger große Schädigung. Während beispielsweise auf eine mit einer Schutzhülle. Kutikula, versehene Cellulose, wie Baum-«-olle, mäßige Wärmegrade verhältnismäßig geringe Einwirkung ausüben, «-erden aus Cellulosernembranen gewonnene Cellulosen stärker angegriffen. Es ist eine alte Erfahrung der Zellstoffindustrie, Zellstoffe bei niedriger Temperatur von 3o bis 5o° zu trocknen, um ihre Eigenschaften möglichst wenig zu beeinträchtigen. Das hat seinen guten Grund, denn jedes Erhitzen von Cellulose ruft eine Veränderung ihrer chemischen Zusammensetzung hervor. Besonders macht sich diese bei chemischen Veredelungsprozessen unliebsam bemerkbar, die ein ziemlich scharfes Trocknen der Cellulose bis zu einem konstanten Wassergehalt zur Voraussetzung haben.Process for drying cellulose using liquid sulphurous Acid The drying of cellulose generally takes place through evaporation of the water through warmth. Depending on its character and origin, celluloses suffer from heat more or less great damage. While, for example, on one with a protective cover. Cuticle, coated cellulose, like tree - «- ole, moderate degrees of warmth in proportion exert little action, earth celluloses obtained from cellulose membranes more attacked. It's an ancient pulp industry experience, pulps to dry at a low temperature of 3o to 5o ° in order to maximize their properties little to affect. There is a good reason for this, because every heating of cellulose causes a change in their chemical composition. Special makes itself this is noticeable in chemical refinement processes, which is quite a A thorough drying of the cellulose to a constant water content is a prerequisite to have.
Die Erfindung besteht in der Fortschaffung des Wassers ohne Erhitzen und wird gelöst durch Verwendung von flüssiger schwefliger Säure, die beim Durchspülen von Cellulose das Wasser herauslöst. Selbst wenn eine geringe Hydrolyse der Cellulose eintritt, ist eine durch Säurewirkung hervorgerufene Schädigung der Cellulose bei ihrer chemischen Weiterverarbeitung viel weniger störend als eine durch Erhitzen hervorgerufene. Die der Cellulose nach Entfernung des Wassers anhaftende flüssige schweflige Säure kann durch Verminderung des Druckes bis zum Vakuum entfernt werden.The invention consists in the removal of the water without heating and is solved by using liquid sulphurous acid when rinsing through of cellulose dissolves the water. Even if there is little hydrolysis of the cellulose occurs is damage to the cellulose caused by the action of acids their chemical processing is much less disruptive than one by heating evoked. The liquid that adheres to the cellulose after the water has been removed Sulphurous acid can be removed by reducing the pressure to a vacuum.
Die Behandlung mit flüssiger schwefliger Säure bietet den weiteren Vorteil, daß man eine absolut wasserfreie Cellulose als Ausgangsmaterial für chemische Weiterverarbeitung bekommt. Eine so getrocknete Cellulose eignet sich beispielsweise besonders für Acetvlieren und Viskosieren.Treatment with liquid sulphurous acid offers the further The advantage of using an absolutely water-free cellulose as the starting material for chemical Further processing gets. Cellulose dried in this way is suitable, for example especially for acetylation and viscose.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED58518D DE524185C (en) | 1929-06-01 | 1929-06-01 | Process for drying cellulose using liquid sulphurous acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED58518D DE524185C (en) | 1929-06-01 | 1929-06-01 | Process for drying cellulose using liquid sulphurous acid |
Publications (1)
Publication Number | Publication Date |
---|---|
DE524185C true DE524185C (en) | 1931-05-04 |
Family
ID=7057453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED58518D Expired DE524185C (en) | 1929-06-01 | 1929-06-01 | Process for drying cellulose using liquid sulphurous acid |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE524185C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1193341B (en) * | 1959-06-16 | 1965-05-20 | Siemens Ag | Method and device for the rapid and continuous drying of welding electrodes |
-
1929
- 1929-06-01 DE DED58518D patent/DE524185C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1193341B (en) * | 1959-06-16 | 1965-05-20 | Siemens Ag | Method and device for the rapid and continuous drying of welding electrodes |
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