DE526797C - Process for the production of acid anhydrides - Google Patents
Process for the production of acid anhydridesInfo
- Publication number
- DE526797C DE526797C DE1928526797D DE526797DD DE526797C DE 526797 C DE526797 C DE 526797C DE 1928526797 D DE1928526797 D DE 1928526797D DE 526797D D DE526797D D DE 526797DD DE 526797 C DE526797 C DE 526797C
- Authority
- DE
- Germany
- Prior art keywords
- production
- acid anhydrides
- aldehyde
- parts
- acid
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von Säureanhydriden Im Hauptpatent wurde ein Verfahren zur Herstellung von Säureanhydriden durch Umsetzung von Estern des Vinylalkohols mit Carbonsäuren unter Abscheidung des entstandenen Aldehyds aus dem Reaktionsgleichgewicht beschrieben.Process for the production of acid anhydrides In the main patent was a process for the preparation of acid anhydrides by reacting esters of the Vinyl alcohol with carboxylic acids with separation of the aldehyde formed from the Reaction equilibrium described.
Grundsätzlich verläuft die Reaktion gemäß dem Hauptpatent am günstigsten, wenn man den entstandenen Aldehyd so rasch wie möglich aus dem Reaktionsgemisch abdestilliert. Es hat sich aber bei der weiteren Ausarbeitung gezeigt, daß es unter Umständen praktisch vorteilhafter sein kann, durch anfängliches Erhitzen am Rückflußkühler der auf den Reaktionskessel aufgesetzten Kolonne den Siedepunkt des Reaktionsgemisches zunächstmehroderweniger zu erhöhen und dann erst den Aldehyd abzutreiben. Obgleich der Fortschritt der Anhydridbildung hierdurch etwas gehemmt wird, überwiegt doch in manchen Fällen der Vorteil, daß der Aldehyd dann schärfer abfraktioniert werden kann. Inwieweit diese Maßnahme im Einzelfalle vorteilhaft wirkt, hängt von dem Arbeitsziel und von der Apparatur ab, in der man die Umsetzung des Vinylesters mit der Carbonsäure vornimmt.In principle, the reaction according to the main patent proceeds most favorably, if you remove the resulting aldehyde from the reaction mixture as quickly as possible distilled off. However, it has been shown in further elaboration that it is under Circumstances can be practically more advantageous by initially heating on the reflux condenser the column placed on the reaction vessel indicates the boiling point of the reaction mixture to increase initially more or less and only then to drive off the aldehyde. Although the progress of the anhydride formation is somewhat inhibited by this, but predominates in some cases the advantage that the aldehyde can then be fractionated more sharply can. The extent to which this measure has an advantageous effect in individual cases depends on the work objective and from the apparatus in which the reaction of the vinyl ester with the carboxylic acid is carried out undertakes.
Beispiel i Ein Gemisch von 86o Teilen Vinylacetat, 6oo Teilen Essigsäure, 2 Teilen Phosphorsäure und i Teil Schwefelsäure wurde am Rückflußkühler gekocht, bis der Siedepunkt auf i2o ° angestiegen war. Der Aldehyd ließ sich dann schärfer abfraktionieren als bei sofortigem Abtreiben, und es wurden 723 Teile Anhydrid erzeugt.Example i A mixture of 86o parts of vinyl acetate, 600 parts of acetic acid, 2 parts of phosphoric acid and 1 part of sulfuric acid was boiled on the reflux condenser, until the boiling point had risen to 120 °. The aldehyde then became sharper fraction off than immediately drive off and 723 parts of anhydride were produced.
Beispiel 2 Ein Gemisch von 57o Teilen Vinylbutyrat und qq.ö Teilen Buttersäure wurde mit i Teil Phosphorsäure und i Teil Schwefelsäure am Rückflußkühler gekocht, bis sein Siedepunkt auf 155 ° angestiegen war. Der Aldehyd ließ sich dann schärfer abfraktionieren als bei sofortigem Abdestillieren. Es wurden 577 Teile Buttersäureanhydrid erzeugt.Example 2 A mixture of 57o parts of vinyl butyrate and qq.ö parts Butyric acid was refluxed with 1 part phosphoric acid and 1 part sulfuric acid cooked until its boiling point had risen to 155 °. The aldehyde then settled Fraction more sharply than with immediate distillation. There were 577 parts Butyric anhydride generated.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE526797T | 1928-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE526797C true DE526797C (en) | 1931-06-10 |
Family
ID=6553097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1928526797D Expired DE526797C (en) | 1928-05-03 | 1928-05-03 | Process for the production of acid anhydrides |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE526797C (en) |
-
1928
- 1928-05-03 DE DE1928526797D patent/DE526797C/en not_active Expired
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