DE422729C - Process for the preparation of acetaldehyde from ethyl alcohol - Google Patents
Process for the preparation of acetaldehyde from ethyl alcoholInfo
- Publication number
- DE422729C DE422729C DEH95540D DEH0095540D DE422729C DE 422729 C DE422729 C DE 422729C DE H95540 D DEH95540 D DE H95540D DE H0095540 D DEH0095540 D DE H0095540D DE 422729 C DE422729 C DE 422729C
- Authority
- DE
- Germany
- Prior art keywords
- ethyl alcohol
- acetaldehyde
- preparation
- silver
- catalyst
- 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
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung von Acetaldehyd aus Äthylalkohol. Man hat bereits vorgeschlagen, Acetaldehyd durch Überleuen von Äthylalkoholdämpfen und Luft bei höherer Temperatur über Asbest mit darauf niedergeschlagenem fein verteilten Silber als Katalysator herzustellen. Im Hinblick auf zahlreiche Kontaktvorgänge, bei denen die feine Verteilung des Katalysators auf Trägern vorteilhafte Wirkungen zeitigt, war anzunehmen, daß auch in vorliegendem Falle der Asbestträger mit dem fein verteilten Silberniederschlag eine kaum verbesserungsfähige Form des Katalysators darstelle.Process for the preparation of acetaldehyde from ethyl alcohol. One has already proposed acetaldehyde by overcoming ethyl alcohol vapors and air at higher temperature over asbestos with finely dispersed on it Produce silver as a catalyst. With regard to numerous contact processes, in which the fine distribution of the catalyst on supports has beneficial effects it was to be assumed that in the present case the asbestos carrier with the finely divided silver precipitate a form of the catalyst that could hardly be improved represent.
Es wurde aber . überraschenderweise gefunden. daß sich ein erheblicher Fortschritt erzielen läßt, wenn man das Silber in Form von Drahtnetzen, Geflechten oder ähnlichen Gebilden, also in weit kompakterer Form anwendet; denn es stellte sich heraus, daß dann nicht nur die Lebensdauer des Katalysators erhöht wird, sondern daß auch die Ausbeute an Aldehyd eine beträchtliche S,eigerung, und zwar bis zu 93,6 Prozent der Theorie erfährt, während Si.berasbest im Höchstfall 70"1 Prozent ergibt.But it was. surprisingly found. that is a significant Progress can be achieved if the silver is in the form of wire nets, braids or similar structures, i.e. in a much more compact form; because it posed it turns out that then not only the life of the catalyst is increased, but that the yield of aldehyde is a considerable increase, up to 93.6 percent of the theory learns, while Si.berasbestos at most 70 "1 percent results.
Ein besonderer Vorteil beim Arbeiten mit Silberdrahtnetz- und Geflechtkontakten liegt noch darin, daß man einstufig, d. h. unter Verwendung nur eines Kontaktrohres arbeiten kann, während bei Benutzung von Silberasbest infolge des heftigen Verlaufs d--r Reaktion der Arbeiten in mehreren Stufen, also in zwei hintereinandergeschalteten Kontaktrohren unerläßlich ist. Beispiel: Durch ein Quarzrohr von 18 mm, welches auf 6o mm Länge mit aufeinanderliegenden Silberdrahtscheiben beschickt ist, werden in der Stunde etwa 2o g Alkohol von 9o Gewichtsprozenten in Dampfform und 25 1 Luft gelehet. Der Vorgang wird durch kurzes Erwärmen des Kata_vsators auf eben sichtbare Rotglut in Gang gesetzt, worauf die Reaktion ohne jede weitere äußere Wärmezufuhr verläuft. Der gebildete Acetaldehyd wird in bekannter Weise aufgefangen, z. B. aus den Reaktionsgasen herausgewaschen. Die Ausbeute beträgt 92,3 Prozent der Theorie.A particular advantage when working with silver wire mesh and braided contacts still lies in the fact that one is single-stage, i. H. using only one contact tube can work while using silver asbestos due to the violent course d - the reaction of the work in several stages, i.e. in two consecutive steps Contact tubes is essential. Example: Through a quartz tube of 18 mm, which is loaded with silver wire disks lying on top of one another over a length of 60 mm an hour about 20 g alcohol of 90 percent by weight in vapor form and 25 liters of air lent. The process is made visible by briefly heating the Kata_vsator Red heat set in motion, whereupon the reaction without any additional external heat supply runs. The acetaldehyde formed is collected in a known manner, for. B. off washed out the reaction gases. The yield is 92.3 percent of theory.
An Stelle von reinem oder wäßrigem Äthylalkohol können auch ,äthylalkoholhaltige Gemische und Lösungen, sofern sie störende Begleitstoffe nicht enthalten, was durch Vorversuche leicht feststellbar ist, verarbeitet werden.Instead of pure or aqueous ethyl alcohol, ethyl alcohol-containing Mixtures and solutions, provided that they do not contain interfering accompanying substances, what through Preliminary tests can be easily determined to be processed.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH95540D DE422729C (en) | 1923-12-19 | 1923-12-19 | Process for the preparation of acetaldehyde from ethyl alcohol |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH95540D DE422729C (en) | 1923-12-19 | 1923-12-19 | Process for the preparation of acetaldehyde from ethyl alcohol |
Publications (1)
Publication Number | Publication Date |
---|---|
DE422729C true DE422729C (en) | 1925-12-10 |
Family
ID=7167314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEH95540D Expired DE422729C (en) | 1923-12-19 | 1923-12-19 | Process for the preparation of acetaldehyde from ethyl alcohol |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE422729C (en) |
-
1923
- 1923-12-19 DE DEH95540D patent/DE422729C/en not_active Expired
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