CH144876A - Process for the production of cellulose acetate. - Google Patents
Process for the production of cellulose acetate.Info
- Publication number
- CH144876A CH144876A CH144876DA CH144876A CH 144876 A CH144876 A CH 144876A CH 144876D A CH144876D A CH 144876DA CH 144876 A CH144876 A CH 144876A
- Authority
- CH
- Switzerland
- Prior art keywords
- cellulose
- production
- cellulose acetate
- acetic anhydride
- acetate
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/20—Esterification with maintenance of the fibrous structure of the cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/06—Cellulose acetate, e.g. mono-acetate, di-acetate or tri-acetate
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
- D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Description
Verfahren zur Herstellung von Zelluloseacetat. Es wurde gefunden, dass man in sehr vorteilhafter Weise Zelluloseacetat herstellen kann, wenn man auf ein Zellulosexanthogenat Essigsäureanhydrid einwirken lässt. Diese Reaktion kann in Gegenwart oder Abwesen heit von Lösungsmitteln oder Katalysatoren durchgeführt werden.
Besonders wertvolle Ergebnisse erzielt man, wenn man unter Ausschluss von solchen Mitteln arbeitet, welche die Zellulosexantho- genate bezw. Zellulosexanthogensäuren und die Zelluloseester lösen.
Der Schutz für das angegebene Verfah ren wird nur so weit beansprucht, als es sich nicht um eine für die Textilindustrie in Betracht kommende Behandlung von Textilfasern zum Zwecke deren Veredlung handelt. <I>Beispiel 1:</I> Gebleichter Zellstoff wird in der üblichen Weise in Viskose übergeführt und letztere versponnen. Als Fällbad dient eine mit Es- sigsäure angesäuerte Alkali- oder Ammo- niumsalzlösung, oder mit Essigsäure versetz ter Methylalkohol. Der ausgefällte wasser lösliche Faden wird mit einer 20%igen Lö sung von Essigsäureanhydrid in Toluol be handelt. Die Temperatur wird bis zum Siede punkt der Lösung gesteigert.
Man erhält eine Esterseide, die schönen Glanz, hervorragende Nassfestigkeit und die färberischen Eigen schaften von Acetatseide besitzt. In Chloro form, Aceton, Eisessig, Pyridin und Nitro- benzol ist das erhaltene Material unlöslich. <I>Beispiel 2:</I> Der nach Beispiel 1 erhaltene Xantho- genatfaden wird mit Essigsäureanhydrid bei etwa 100 behandelt, das Fasermaterial aus geschleudert und mit Wasser gewaschen.
Man erhält eine glanzlose, matte Kunstseide. Wird vor dem Auswaschen das dem Material noch anhaftende Essigsäureanhydrid durch Verdunstenlassen entfernt, so besitzt die er haltene Faser den üblichen Kunstseidenglanz. <I>Beispiel 3:</I> Faseriges Zellulosexanthogenat, entspre chend 10 Teilen Zellulose, wird in 50%ige Chlorzinklösung eingelegt, ausgepresst und, ohne zu waschen, in 100 Teile Essigsäure anhydrid, verdünnt mit 150 Teilen Xylol, gegeben und erwärmt. Bei 60 bis 70 findet stürmische Reaktion statt.
Nach einstündigem Erwärmen auf dem kochenden Wasserbade wird die Flüssigkeit abgelassen und das Zellulosematerial ausgewaschen. Man erhält ein hartes, sprödes Produkt, dessen Zusam mensetzung annähernd der eines Zellulose- Triacetates entspricht. Das erhaltene Acetat ist in Eisessig und Nitrobenzol löslich, in Chloroform nur quellbar.
Wird ohne Verdünnungsmittel gearbeitet, so geht die Reaktion unter Lösung des ent- stehenden Acetates vor sich. Dabei steigt die Temperatur des Reaktionsgemisches durch die Reaktionswärme von selbst über <B>100'</B> hinaus und eine äussere Wärmezufuhr ist überflüssig. Das erhaltene, mit Wasser ausgefällte Material ist löslich in Eisessig, Nitrobenzol, Chloroform und teilweise in Aceton.
Process for the production of cellulose acetate. It has been found that cellulose acetate can be produced in a very advantageous manner if acetic anhydride is allowed to act on a cellulose xanthate. This reaction can be carried out in the presence or absence of solvents or catalysts.
Particularly valuable results are obtained if one works with the exclusion of such agents, which respectively cellulose xanthogenates. Dissolve cellulose xanthogenic acids and the cellulose esters.
Protection for the specified method is only claimed as far as it does not involve a treatment of textile fibers for the purpose of their finishing that is suitable for the textile industry. <I> Example 1 </I> Bleached cellulose is converted into viscose in the usual way and the latter is spun. An alkali metal or ammonium salt solution acidified with acetic acid or methyl alcohol mixed with acetic acid serves as the precipitation bath. The precipitated water-soluble thread is treated with a 20% solution of acetic anhydride in toluene. The temperature is increased to the boiling point of the solution.
An ester silk is obtained which has a beautiful gloss, excellent wet strength and the dyeing properties of acetate silk. The material obtained is insoluble in chloro form, acetone, glacial acetic acid, pyridine and nitrobenzene. <I> Example 2: </I> The xanthogenate thread obtained according to Example 1 is treated with acetic anhydride at about 100, the fiber material is spun out and washed with water.
A dull, matt artificial silk is obtained. If the acetic anhydride still adhering to the material is removed by allowing it to evaporate before it is washed out, the fiber it holds has the usual rayon gloss. <I> Example 3: </I> Fibrous cellulose xanthogenate, corresponding to 10 parts of cellulose, is placed in 50% zinc chloride solution, pressed out and, without washing, added to 100 parts of acetic anhydride, diluted with 150 parts of xylene, and heated. At 60 to 70 there is a stormy reaction.
After one hour of warming on the boiling water bath, the liquid is drained and the cellulose material is washed out. A hard, brittle product is obtained, the composition of which corresponds approximately to that of a cellulose triacetate. The acetate obtained is soluble in glacial acetic acid and nitrobenzene, but only swellable in chloroform.
If the work is carried out without a diluent, the reaction proceeds with the resulting acetate dissolving. The heat of reaction causes the temperature of the reaction mixture to rise by itself over <B> 100 '</B> and an external supply of heat is superfluous. The material obtained, precipitated with water, is soluble in glacial acetic acid, nitrobenzene, chloroform and partly in acetone.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH144876T | 1929-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH144876A true CH144876A (en) | 1931-01-31 |
Family
ID=4401236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH144876D CH144876A (en) | 1929-06-01 | 1929-06-01 | Process for the production of cellulose acetate. |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH144876A (en) |
GB (1) | GB349322A (en) |
-
1929
- 1929-06-01 CH CH144876D patent/CH144876A/en unknown
-
1930
- 1930-06-02 GB GB17014/30A patent/GB349322A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB349322A (en) | 1931-05-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE807395C (en) | Process for the impregnation of fibers with synthetic, chain-shaped polyamides | |
CH144876A (en) | Process for the production of cellulose acetate. | |
DE937970C (en) | Process for the production of threads or staple fibers from secondary cellulose acetate | |
DE706870C (en) | Process for esterifying cellulose fibers or structures made from cellulose while maintaining their structure | |
DE909491C (en) | Process for the production of threads or fibers from casein | |
DE498157C (en) | Process for the production of artificial structures, especially rayon | |
DE573740C (en) | Process for the production of artificial structures from fibroin solutions | |
DE560036C (en) | Process for the production of cellulose esters | |
DE536730C (en) | Process for the immunization of textile fabrics made of vegetable fibers against direct dyes | |
DE823738C (en) | Process for the production of o-aminothiophenol or its alkali salts | |
DE550760C (en) | Process for the production of cellulose derivatives | |
DE815965C (en) | Process for refining cellulose hydrate textiles while maintaining the fiber structure by esterification | |
DE680879C (en) | Process for the production of condensation products | |
DE731303C (en) | Process for the production of curled rayon | |
DE668950C (en) | Process for the preparation of cellulose esters which are insoluble in organic solvents | |
AT128866B (en) | Process for the preparation of cellulose esters. | |
DE554696C (en) | Process for the production of fatty acid esters of cellulose | |
DE710903C (en) | Process for esterifying cellulose fibers or structures made of cellulose while maintaining the fiber structure | |
DE526479C (en) | Process for the preparation of cellulose esters | |
DE878429C (en) | Process for the production of shaped articles from chloroform-soluble acetyl cellulose | |
DE515679C (en) | Process for the production of acylated oxyfatty acids and their soaps | |
AT127380B (en) | Preparations for treating textiles. | |
DE748927C (en) | Process for improving the spinnability of cellulose hydrate fibers | |
DE930514C (en) | Process for making amine yarn | |
GB335605A (en) | Improvements in or relating to the production of artificial silk or the like from viscose solution |