DE153350C - - Google Patents
Info
- Publication number
- DE153350C DE153350C DE1901153350D DE153350DA DE153350C DE 153350 C DE153350 C DE 153350C DE 1901153350 D DE1901153350 D DE 1901153350D DE 153350D A DE153350D A DE 153350DA DE 153350 C DE153350 C DE 153350C
- Authority
- DE
- Germany
- Prior art keywords
- hydrocellulose
- alcohol
- sulfuric acid
- acetic anhydride
- solution
- 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 - Lifetime
Links
- WFDIJRYMOXRFFG-UHFFFAOYSA-N acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 claims 1
- 229920002678 cellulose Polymers 0.000 claims 1
- 239000001913 cellulose Substances 0.000 claims 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229960000583 Acetic Acid Drugs 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229940081735 acetylcellulose Drugs 0.000 description 2
- 230000001476 alcoholic Effects 0.000 description 2
- 239000012362 glacial acetic acid Substances 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000001828 Gelatine Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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
- C08B3/06—Cellulose acetate, e.g. mono-acetate, di-acetate or tri-acetate
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
besesp
(Si/ncpHiqfc bc-z οαιιι-τννί-ί-n
fi'pi *2fηfcfcfl faJ^e _ _ (Si / ncpHiqfc bc-z οαιιι-τννί-ί-n
fi'pi * 2fηfcfcfl faJ ^ e _ _
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Über die Einwirkung von Essigsäureanhydrid und Schwefelsäure auf Hydrocellulose ist bekannt geworden, daß, wenn man Essigsäureanhydrid in Gegenwart geringer Mengen Schwefelsäure auf Hydrocellulose einwirken läßt, man zu alkoholunlöslicher Acetylcellulose gelangt (vergl. Patentschriften 118538 und 120713).About the action of acetic anhydride and sulfuric acid on hydrocellulose it has become known that when acetic anhydride is used in the presence of small amounts Sulfuric acid is allowed to act on hydrocellulose, it becomes alcohol-insoluble acetyl cellulose arrives (see patent specifications 118538 and 120713).
Es wurde nun die Beobachtung gemacht, daß, wenn man auf Hydrocellulose Essigsäureanhydrid bei Gegenwart größerer Mengen konzentrierter Schwefelsäure, als wie sie nach den Beispielen der erwähnten Patentschriften angewendet werden, einwirken läßt, man zu einem ganz anderen Ergebnis gelangt; man erhält nämlich eine bisher nicht bekannte Acetylcellulose, welche in Alkohol außerordentlich leicht löslich ist, und deren konzentrierte alkoholische Lösung in der Kälte eine Masse von der Konsistenz erstarrter Gelatine bildet, die sich beim Erwärmen oder bei Zusatz von Alkohol wieder verflüssigt. Die alkoholischen Lösungen, sowie die Lösungen in Aceton, Eisessig usw. werden durch Wasser in Flocken gefällt.The observation has now been made that when one looks at hydrocellulose, acetic anhydride in the presence of larger amounts of concentrated sulfuric acid than as in the examples of the patents mentioned be applied, allowed to act, one arrives at a completely different result; man This is because it contains a previously unknown acetyl cellulose, which is extraordinary in alcohol is easily soluble, and its concentrated alcoholic solution solidifies in the cold to a mass of the consistency Gelatine forms, which liquefy again when heated or when alcohol is added. The alcoholic solutions, as well as the solutions in acetone, glacial acetic acid etc. are used precipitated in flakes by water.
Beispiel. 125 gHydrocellulose werden in ein Gemisch von 500 g Eisessig, 500 g Essigsäureanhydrid und 25 g Schwefelsäure von 66° Be. eingetragen. Das Reaktionsgemisch wird durch Abkühlung möglichst auf Zimmertemperatur gehalten und von Zeit zu Zeit durch Umrühren gleichmäßig verteilt. Nach wenigen Stunden bereits ist die Hydrocellulose in Lösung gegangen, und das Reaktionsgemisch bildet alsdann eine dünnflüssige, leicht filtrierbare Lösung. Diese wird in Wasser gegossen, wobei das neue Produkt in weißen Flocken ausfällt, welche abgepreßt und in der fünffachen Menge Alkohol in der Wärme gelöst werden. Die so erhaltene klare Lösung erstarrt beim Erkalten zu einer gelatineartigen Masse von den oben erwähnten Eigenschaften.Example. 125 g of hydrocellulose are used in a mixture of 500 g of glacial acetic acid, 500 g of acetic anhydride and 25 g of sulfuric acid 66 ° Be. registered. The reaction mixture is cooled to room temperature if possible held and evenly distributed from time to time by stirring. After a few hours, the hydrocellulose is in Solution gone, and the reaction mixture then forms a thin, easily filterable Solution. This is poured into water, whereby the new product precipitates in white flakes, which are squeezed and in five times the amount of alcohol can be dissolved in the heat. The clear solution thus obtained solidifies on cooling to a gelatinous mass with the properties mentioned above.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT21213D AT21213B (en) | 1901-08-01 | 1901-12-23 | Process for the preparation of an alcohol-soluble acetyl derivative of cellulose. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE153350C true DE153350C (en) |
Family
ID=419993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1901153350D Expired - Lifetime DE153350C (en) | 1901-08-01 | 1901-08-01 |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE153350C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029243A (en) * | 1975-02-28 | 1977-06-14 | Samuel Zerobnick | Integrated belt-supported backpack |
-
1901
- 1901-08-01 DE DE1901153350D patent/DE153350C/de not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029243A (en) * | 1975-02-28 | 1977-06-14 | Samuel Zerobnick | Integrated belt-supported backpack |
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