CH96140A - Process for the manufacture of a cellulose acetate. - Google Patents
Process for the manufacture of a cellulose acetate.Info
- Publication number
- CH96140A CH96140A CH96140DA CH96140A CH 96140 A CH96140 A CH 96140A CH 96140D A CH96140D A CH 96140DA CH 96140 A CH96140 A CH 96140A
- Authority
- CH
- Switzerland
- Prior art keywords
- parts
- sep
- cellulose acetate
- hours
- chloroform
- Prior art date
Links
- 229920002301 cellulose acetate Polymers 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title description 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 21
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 7
- 229920002678 cellulose Polymers 0.000 claims description 5
- 239000001913 cellulose Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 150000008064 anhydrides Chemical class 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- 238000006266 etherification reaction Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 229960000583 acetic acid Drugs 0.000 claims 3
- 239000012362 glacial acetic acid Substances 0.000 claims 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- 230000021736 acetylation Effects 0.000 description 2
- 238000006640 acetylation reaction Methods 0.000 description 2
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006196 deacetylation Effects 0.000 description 1
- 238000003381 deacetylation reaction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
Landscapes
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
Procédé de fabrication d'un acétate de cellulose. Le brevet principal n 68996 décrit un procédé pour la préparation d'un acétate de cellulose, caractérisé en ce que l'on fait pré-- céder l'éthérification d'un traitement préalable par un catalyseur dissous dans l'acide acéti que glacial en présence de petites quantités d'anhydride acétique.
Il a été reconnu qu'en exécutant le traite ment préalable à une température ne dépassant pas 30 0 C, on peut obtenir un acétate inso luble dans le chloroforme.
<I>Exemple I:</I> 100 parties de cellulose sont maintenues en contact durant 3 à 4 heures à 25 0 C avec un mélange constitué comme suit:
EMI0001.0004
Acide <SEP> acétique <SEP> 100 <SEP> % <SEP> 610 <SEP> parties,
<tb> Acide <SEP> sulfurique <SEP> 100 <SEP> % <SEP> 5 <SEP> parties,
<tb> Anhydride <SEP> acétique <SEP> 50 <SEP> parties. La cellulose se désagrège rapidement et forme bientôt une pâte homogène, que l'on peut très facilement agiter.
On ajoute alors 250 parties d'anhydride. En maintenant la température vers 40 0<B>0</B> on obtient, après 1 à 2 heures, une masse vis queuse et d'une limpidité parfaite, qui, pré cipitée par l'eau; donne un acétate de cellu lose insoluble dans le chloroforme, mais qui y devient translucide et s'y gonfle énormément. 8i, au lieu de précipiter directement, on sa ponifie partiellement, on obtient facilement des produits de désacétylation nouveaux, dont quelques-uns sont insolubles dans le chloro forme et solubles dans l'acétone, dont d'autres sont par exemple solubles dans l'acétate d'éthyle.
Exemple <B><I>Il:</I></B> 100 parties de cellulose sont addition nées de:
EMI0001.0007
Acide <SEP> acétique <SEP> 100% <SEP> 610 <SEP> parties,
<tb> Acide <SEP> sulfurique <SEP> 100'/o <SEP> 3 <SEP> parties,
<tb> Anhydride <SEP> acétique <SEP> 50 <SEP> parties. On chauffe à 30 0 C, durant 4 heures en viron. Au bout de ce temps la masse réac tionnelle se présente sous forme d'une bouillie qui peut être facilement malaxée et qui se prête parfaitement à l'acétylation. Cette acétylation se fait dans des con ditions identiques à celles de l'exemple I. Elle fournit également un acétate de cellulose insoluble dans le chloroforme.
Cet acétate sa ponifié partiellement conduit à l'obtention d'acétates nouveaux, dont certains sont in solubles dans le chloroforme et solubles dans l'acétone.
Process for the manufacture of a cellulose acetate. Main Patent No. 68996 describes a process for the preparation of a cellulose acetate, characterized in that the etherification of a pretreatment is carried out beforehand with a catalyst dissolved in glacial acetate acid. presence of small amounts of acetic anhydride.
It has been recognized that by carrying out the preliminary treatment at a temperature not exceeding 30 ° C., an acetate insoluble in chloroform can be obtained.
<I> Example I: </I> 100 parts of cellulose are kept in contact for 3 to 4 hours at 25 ° C. with a mixture made up as follows:
EMI0001.0004
Acetic <SEP> Acetic <SEP> 100 <SEP>% <SEP> 610 <SEP> parts,
<tb> Sulfuric acid <SEP> <SEP> 100 <SEP>% <SEP> 5 <SEP> parts,
<tb> Acetic anhydride <SEP> <SEP> 50 <SEP> parts. The cellulose disintegrates quickly and soon forms a homogeneous paste, which can be very easily stirred.
250 parts of anhydride are then added. By maintaining the temperature around 40 0 <B> 0 </B> one obtains, after 1 to 2 hours, a viscous mass of perfect clarity, which, precipitated by water; gives a cellulose acetate insoluble in chloroform, but which becomes translucent there and swells enormously. 8i, instead of precipitating directly, it is partially ponified, and new deacetylation products are easily obtained, some of which are insoluble in chloroform and soluble in acetone, others of which are for example soluble in ethyl acetate.
Example <B><I>Il:</I> </B> 100 parts of cellulose are added from:
EMI0001.0007
Acetic <SEP> <SEP> 100% <SEP> 610 <SEP> parts,
<tb> Sulfuric acid <SEP> <SEP> 100 '/ o <SEP> 3 <SEP> parts,
<tb> Acetic anhydride <SEP> <SEP> 50 <SEP> parts. Heated to 30 0 C for about 4 hours. At the end of this time, the reaction mass is in the form of a slurry which can be easily mixed and which lends itself perfectly to acetylation. This acetylation is carried out under conditions identical to those of Example I. It also provides a cellulose acetate insoluble in chloroform.
This partially ponified acetate results in the production of new acetates, some of which are insoluble in chloroform and soluble in acetone.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH68996T | 1914-06-08 | ||
| FR96140X | 1919-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH96140A true CH96140A (en) | 1922-09-16 |
Family
ID=25700354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH96140D CH96140A (en) | 1914-06-08 | 1920-09-29 | Process for the manufacture of a cellulose acetate. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH96140A (en) |
-
1920
- 1920-09-29 CH CH96140D patent/CH96140A/en unknown
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