BE337048A - - Google Patents
Info
- Publication number
- BE337048A BE337048A BE337048DA BE337048A BE 337048 A BE337048 A BE 337048A BE 337048D A BE337048D A BE 337048DA BE 337048 A BE337048 A BE 337048A
- Authority
- BE
- Belgium
- Prior art keywords
- cellulose
- chromium
- acetic acid
- acetate
- desc
- Prior art date
Links
- WFDIJRYMOXRFFG-UHFFFAOYSA-N acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 8
- 229920002678 cellulose Polymers 0.000 claims description 5
- 239000001913 cellulose Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229920002301 Cellulose acetate Polymers 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 150000001242 acetic acid derivatives Chemical class 0.000 claims 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 239000000047 product Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- 230000000397 acetylating Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate dianion Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- LRCIYVMVWAMTKX-UHFFFAOYSA-L Chromium(II) acetate Chemical compound [Cr+2].CC([O-])=O.CC([O-])=O LRCIYVMVWAMTKX-UHFFFAOYSA-L 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- FOCAUTSVDIKZOP-UHFFFAOYSA-M chloroacetate Chemical compound [O-]C(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-M 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000012084 conversion product Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003863 metallic catalyst Substances 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-M triacetate(1-) Chemical compound CC(=O)CC(=O)CC([O-])=O ILJSQTXMGCGYMG-UHFFFAOYSA-M 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
<Desc/Clms Page number 1>
Procédé de fabrication de l'acétate de cellulose.
La présente invention a pour objet un procédé de fabrication de l'acétate de cellulose par le traitement de cellulose ou de ses produits de conversion voisins au moyen d'un mélange acéty- lisant consistant en anhydride acétique et en acide acétique.
Suivant linvention ,on soumet la cellulose de préférence séchée à l'air demanière à contenir 6% à 7% d'humidité rési- duaire,à un procédé acétylisant par traitement avec de l'anhy- dride acétique de l'acide acétique, et un catalyseur métallique notamment le chrome.
Le chromé peut se trouver sous une forme quelconque appropriée,telle que l'acétate ,1 e sulfate ,le nitra- te,le butyrate,le benzène sulfonate, naphtalène-sulfonate,le chlo racétate,le carbonate,l'oxyde hydraté ou des équivalents. l'exemplequi suit sert à illustrer l' inv enti on, bi en que cslle-ci ne soit nullement limitée à ce mode de procéder :
Exemple¯; On dissout 140 grammes d'acétate de chrome dans 13,5 kgs. environ d'acide acétique contenusdans un récipient approprié,muni d,un condenseur à reflux et d,un agitateur ; on ajoute alors environ 4,5 kgs. d'anhydride acétique,et finalement
<Desc/Clms Page number 2>
1,35 kg. de cellulose,de préférence sous forme de tissusde papier séché à l'air,préparé au moyen de coton pur.
On chauffe alors le mélange jusqu'au point d'ébullition jusqu'à ce que le cellulose ait passé dans la solution,la masse étant de préféren ce agitée pendant toute la durée de l'opération. Après cela,le produit peut être précipité de la manière usuelle quand on constatera qu'il est soluble dans le chloroforme; ou bien que l'on peut le soumettre à l'un quelconque des procédés connus, pour en modifier la solubilité.
Les solutions de ce nouveau produit sont gélatineuses et trouvent leur application dans les industries où cette proprié- té est recherchée. Il est bien entendu que l'on peut faire varier les proportions dans des limites étendues,pourvu que la quantité d'acide acétique soit telle que l'on puisse facilement manipuler le produit pendant toute la durée du procédé et que laquantité d'hy anhydride présente un excès raisonnable au-delà de celle requise pour former le triacétate. En outre,on peut faire varier à volonté la forme sous laquelle le chrome est introduit,bien qui il soit préférable de l'employer sous forme d'acétate ,ce sel étant exempt des inconvénients introduits par les effets du radical acide.
En outre,la quantité de sel de chrome ajoutée peut être sensiblement modifiée,pourvu toute- fois que la quantité employée soit suffisante pout effectuer 1' acétylation voulue, en un temps raisonnable. En outre, on peut également faire varier la température dans certaines limites, pourvu qu'elles permettent d'effectuer l'opération,en une pé- riode de temps raisonnable.
<Desc / Clms Page number 1>
Process for manufacturing cellulose acetate.
The subject of the present invention is a process for the manufacture of cellulose acetate by treating cellulose or its related conversion products by means of an acetylating mixture consisting of acetic anhydride and acetic acid.
According to the invention, the cellulose, preferably air-dried, so as to contain 6% to 7% residual moisture, is subjected to an acetylating process by treatment with acetic anhydride of acetic acid, and a metallic catalyst, in particular chromium.
The chromium may be in any suitable form, such as acetate, sulfate, nitrate, butyrate, benzene sulfonate, naphthalenesulfonate, chloracetate, carbonate, oxide hydrate or acids. equivalent. the following example serves to illustrate the inv enti on, although it is not limited to this method of proceeding:
Example; 140 grams of chromium acetate are dissolved in 13.5 kgs. approximately acetic acid contained in a suitable vessel fitted with a reflux condenser and stirrer; then add about 4.5 kgs. acetic anhydride, and finally
<Desc / Clms Page number 2>
1.35 kg. cellulose, preferably in the form of air-dried paper fabrics, prepared using pure cotton.
The mixture is then heated to the boiling point until the cellulose has passed into the solution, the mass preferably being stirred throughout the operation. After that, the product can be precipitated in the usual manner when it is found to be soluble in chloroform; or else that it can be subjected to any of the known methods to modify its solubility.
The solutions of this new product are gelatinous and find their application in industries where this property is sought after. Of course, the proportions can be varied within wide limits, provided that the amount of acetic acid is such that the product can be easily handled throughout the process and that the amount of hy anhydride exhibits a reasonable excess beyond that required to form the triacetate. In addition, the form in which the chromium is introduced can be varied at will, although it is preferable to use it in the form of acetate, this salt being free from the drawbacks introduced by the effects of the acid radical.
Further, the amount of chromium salt added can be significantly varied, provided however that the amount employed is sufficient to effect the desired acetylation in a reasonable time. In addition, the temperature can also be varied within certain limits, provided that they allow the operation to be carried out in a reasonable period of time.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE337048A true BE337048A (en) |
Family
ID=15236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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BE337048D BE337048A (en) |
Country Status (1)
Country | Link |
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BE (1) | BE337048A (en) |
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0
- BE BE337048D patent/BE337048A/fr unknown
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