DE939127C - Process for acetylating papers - Google Patents

Process for acetylating papers

Info

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
Application number
DES14976D
Other languages
German (de)
Inventor
Hermann Dr Boesche
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to DES14976D priority Critical patent/DE939127C/en
Application granted granted Critical
Publication of DE939127C publication Critical patent/DE939127C/en
Expired legal-status Critical Current

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)

PATENTANSPRÜCHE-i. . Verfahren zum Acetylieren von Papieren unter Verwendung von Abkömmlingen organi. scher Basen an Stelle von Säuren oder Schwermetallsalzen als Katalysator, dadurch gekennzeichnet, daß als Acetylierungsflüssigkeit Essigsäureanhydxid verwendet wird, das etwa i Ojo Pyridiniumchloirid .enthält. PATENT CLAIMS-i. . Process for acetylating papers under Use of descendants organi. shear bases instead of acids or heavy metal salts as a catalyst, characterized in that acetic anhydxide is used as the acetylating liquid is used, which contains about i Ojo pyridinium chloride. 2. Verfahren. nach Anspruch i, dadurch gekennzeichnet, @daß die Acetylierung unter Unterdruckdurchgeführt wird. Angezogene Druckschriften: USA.-Patentschrift Nr. 2029481.2. Procedure. according to claim i, characterized in that the acetylation is carried out under reduced pressure. Cited references: U.S. Patent No. 2029481.
DES14976D 1938-06-12 1938-06-12 Process for acetylating papers Expired DE939127C (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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