DE939127C - Process for acetylating papers - Google Patents
Process for acetylating papersInfo
- Publication number
- DE939127C DE939127C DES14976D DES0014976D DE939127C DE 939127 C DE939127 C DE 939127C DE S14976 D DES14976 D DE S14976D DE S0014976 D DES0014976 D DE S0014976D DE 939127 C DE939127 C DE 939127C
- Authority
- DE
- Germany
- Prior art keywords
- acetylating
- papers
- acetylation
- pyridinium chloride
- acids
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
Landscapes
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Description
Verfahren zum Acetylieren von Papieren Es ist bereits vorgeschlagen worden, bei der Acetylierung von Faserstoffen auf die Verwendung der üblichem Katalysatoren in Form von Säuren oder Schwezmetallsalzen zu verzichten und an deren Stelle organische Basen oder Abkömmlinge solcher Basen, unter anderem auch Pyridin, zu verwenden. Hierdurch wird ein Angriff der als Katalysatoren dienenden Säuren auf die Fasern verhindert und die Festigkeit der acetylierten Faserstoffbahnen nicht unwesentlich .erhöht.Process for acetylating papers It has already been proposed been used in the acetylation of fiber on the use of the usual catalysts in the form of acids or sulfur metal salts and replace them with organic ones Bases or derivatives of such bases, including pyridine, to use. This causes the acids serving as catalysts to attack the fibers prevented and the strength of the acetylated fibrous webs is not insignificant .elevated.
Es ist auch bereits bekannt, zur Veresterung von Zellulosematerial, und zwar insbesondere von regenerierter Zellulose, als Katalysator Pyridiniumchlorid in einer Menge von etwa i : 5o im Verhältnis zu der behandelten Zellulose zu verwenden. Die Erfindung bezieht sich demgegenüber auf ein Verfahren zum Acetylieren von Papier, das für chemische Nachbehandlung verhältnismäßig empfindlich ist, so daß hierbei besonderer Wert .auf eine milde Behandlung gelegt werden muiß, um vor allem die Festigkeit nicht zu beeinträchtigen.It is also already known for the esterification of cellulosic material, in particular regenerated cellulose, pyridinium chloride as a catalyst to be used in an amount of about i: 50 relative to the treated cellulose. In contrast, the invention relates to a process for acetylating paper, which is relatively sensitive to chemical aftertreatment, so that here Special emphasis must be placed on mild treatment, especially in order to avoid the Not to compromise strength.
Die Erfindung besteht darin, daß zum Aoetylieren von Papier unter Verwendung von Abkömmlingen organischer Basen an Stelle von Säuren oder Schwermetallsalzen als Katalysator eine Acetylierungsflüsisigkeit verwendet wird, die aus Essigsäureanhydrid mit etwa 10/6 Pyridiniumchlorid besteht.The invention consists in that for aoetylating paper under Use of derivatives of organic bases instead of acids or heavy metal salts Acetylierungsflüsigkeit is used as a catalyst, which is made from acetic anhydride with about 10/6 pyridinium chloride.
Das Pyridiniumchlorid wird vorzugsweise durch Einleiten von trockenem Salzsäuregas in Pyridin hergestellt und ist in Essigsäureanhydrid löslich. Es kann vorteilhaft in Form einer gesättigten Lösung vorrätig gehalten werden. Die Acetylierung kann in einem geschlossenen Gefäß vor sich gehen, wobei gegebenenfalls Umlaufpumpen oder Sprudelvorrichtungen verwendet werden können. Die Acetylierwngsflüssigkeit wird dabei bis zum Siedepunkt erhitzt. Um die Reaktionstemperatur herabzusetzen, empfiehlt es sich, dass Verfahren unter Unterdruck durchzuführen.The pyridinium chloride is preferably by introducing dry Hydrochloric acid gas is made in pyridine and is soluble in acetic anhydride. It can advantageously be kept in stock in the form of a saturated solution. The acetylation can going on in a closed vessel, with possibly circulation pumps or Bubbler devices can be used. The acetylation fluid will heated to boiling point. To reduce the reaction temperature, recommends it is necessary to carry out the procedure under negative pressure.
Die Acetylierungsflüssigkeit wird bis zur Erreichung des gewünschten Acetylierungsgrades, der in der Regel bei etwa 30% Aoetylgehalt liegt, auf die Faserstoffe einwirken gelassen. Nach Erreichung des gewünschten Grades werden die Reste des Acetylierungsgemvsches - zweckmäßig durch Abschleudern oder Erhitzen im Vakuum -entfernt, wobei Essigsäureanhydrid zurückgewonnen werden kann. Das verwendete Acetyllerungsgemisch kann mehrfach Verwendung finden, es empfiehlt sich jedoch, vor jeder Verwendung eine geringe Menge frischen Pyridiniumchlorides zuzusetzen.The acetylating fluid is used until the desired Degree of acetylation, which is usually around 30% aoetyl content, on the fiber allowed to act. After reaching the desired level, the remains of the Acetylation mixtures - expediently removed by centrifuging or heating in a vacuum, whereby acetic anhydride can be recovered. The acetylation mixture used can be used several times, but it is advisable to use it before each use add a small amount of fresh pyridinium chloride.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES14976D DE939127C (en) | 1938-06-12 | 1938-06-12 | Process for acetylating papers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES14976D DE939127C (en) | 1938-06-12 | 1938-06-12 | Process for acetylating papers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE939127C true DE939127C (en) | 1956-02-16 |
Family
ID=7474798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES14976D Expired DE939127C (en) | 1938-06-12 | 1938-06-12 | Process for acetylating papers |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE939127C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260964B (en) * | 1959-01-12 | 1968-02-08 | Eastman Kodak Co | Process for the production of paper that is dimensionally stable when exposed to moisture |
DE3816035A1 (en) * | 1986-10-20 | 1989-11-16 | Nippon Kodoshi Corp | ELECTROLYTE PAPER FOR AN ELECTROLYTE CAPACITOR |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2029481A (en) * | 1933-03-29 | 1936-02-04 | Du Pont Cellophane Co Inc | Esterification of cellulosic materials |
-
1938
- 1938-06-12 DE DES14976D patent/DE939127C/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2029481A (en) * | 1933-03-29 | 1936-02-04 | Du Pont Cellophane Co Inc | Esterification of cellulosic materials |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1260964B (en) * | 1959-01-12 | 1968-02-08 | Eastman Kodak Co | Process for the production of paper that is dimensionally stable when exposed to moisture |
DE3816035A1 (en) * | 1986-10-20 | 1989-11-16 | Nippon Kodoshi Corp | ELECTROLYTE PAPER FOR AN ELECTROLYTE CAPACITOR |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE737527C (en) | Process for the production of fibrous webs from cellulose fibers which have been esterified while maintaining their structure | |
DE975736C (en) | Process for hydrophobing and waterproofing fabrics | |
DE939127C (en) | Process for acetylating papers | |
DE556393C (en) | Process for sizing fibers | |
DE756904C (en) | Process for the hydrophobing of textile goods | |
DE1004134B (en) | Process for treating fibrous materials | |
DE619019C (en) | Process for the production of acidic phosphoric acid esters of high molecular weight aliphatic alcohols | |
DE752308C (en) | Process for reducing the water absorbency of paper | |
DE892439C (en) | Process for the production of cellulose triesters | |
DE704154C (en) | Process for breaking down cellulosic substances | |
DE557537C (en) | Process for the production of a very low-resin cellulose | |
DE712785C (en) | Process for improving the esterification ability of cellulose | |
DE1808937A1 (en) | Process for the production of partially acylated regenerated cellulose film or fiber | |
AT158154B (en) | Process for the hydrolysis of cellulosic raw materials. | |
DE717381C (en) | Finishing, especially the stiffening of hats | |
DE915451C (en) | Process for the production of cellulose triesters | |
DE749539C (en) | Exclusion procedure for fibers | |
AT160457B (en) | Process for the processing of used esterification baths. | |
DE535724C (en) | Process for obtaining an anhydrous reaction mixture for the acetylation of celulose | |
DE302524C (en) | ||
CH150791A (en) | Process for the production of a new cellulose derivative. | |
AT136005B (en) | Process for the production of practically pure cellulose (alpha cellulose) from raw celluloses of any origin. | |
DE556063C (en) | Process for the production of alkyl celluloses | |
AT160471B (en) | Process for the production of synthetic compositions from materials such as cellulose, wood, asbestos, leather waste, etc. and for the preservation, in particular of wood. | |
DE523999C (en) | Method for bleaching montan wax |