DE301274C - - Google Patents

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Publication number
DE301274C
DE301274C DENDAT301274D DE301274DA DE301274C DE 301274 C DE301274 C DE 301274C DE NDAT301274 D DENDAT301274 D DE NDAT301274D DE 301274D A DE301274D A DE 301274DA DE 301274 C DE301274 C DE 301274C
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Germany
Prior art keywords
aldehyde
acetic acid
oxygen
acetaldehyde
reaction
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DENDAT301274D
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German (de)
Publication of DE301274C publication Critical patent/DE301274C/de
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/23Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of oxygen-containing groups to carboxyl groups
    • C07C51/235Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of oxygen-containing groups to carboxyl groups of —CHO groups or primary alcohol groups

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  • 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)

Claims (1)

Die Herstellung von Essigsäure aus Acetaldehyd und Sauerstoff mußte wegen des niedrigen Siedepunktes des Acetaldehyde (21 °) bisher bei verhältnismäßig niedriger Temperatur vorgenommen werden. Dabei sind aber die Ausbeuten an Essigsäure sehr gering. Eine Steigerung der Ausbeute wird erzielt, wenn man unter Drück im geschlossenen Gefäß und bei höherer Temperatur arbeitet. Das hatThe production of acetic acid from acetaldehyde and oxygen had to be done because of the low boiling point of acetaldehyde (21 °) hitherto have been carried out at a relatively low temperature. But there are the yields of acetic acid are very low. An increase in the yield is achieved if one works under pressure in a closed vessel and at a higher temperature. That has ο aber wiederum den Nachteil, daß die Reaktion so intensiv vonstatten geht, daß sich die Temperatur unerwünscht steigert, so daß Drucksteigerungen und Explosionen die Folgen sind. Es ist bekannt, bei der Oxydation des Aldehyds diesem Eisessig seine Chlorderivate, Essigsäureanhydrid, ihre Homologen oder ein Gemisch derselben beizusetzen; auch hat man es bereits mit einem Wasserzusatz versticht. Jedoch entstehen in beiden Fällen bei der Reaktion Verbindungen, die sowohl von günstigem als auch nachteiligem Einfluß auf die Ausbeute sein können,ο but again the disadvantage that the reaction takes place so intensely that the Temperature increases undesirably, so that pressure increases and explosions are the consequences. It is known that during the oxidation of the aldehyde, this glacial acetic acid contains its chlorine derivatives, To add acetic anhydride, their homologues or a mixture thereof; one also has it already ceases with the addition of water. However, in both cases the Reaction Compounds that are both beneficial and detrimental to the Yield can be Die Erfindung geht von dem Gedanken aus, daß man bei der Reaktion nur die Flüchtigkeit des Aldehyds herabsetzt, indem man ihn in geeigneten Lösungsmitteln auflöst, welche seine Flüchtigkeit herabsetzen, ohne bei der Oxydation Verbindungen entstehen zu lassen, welche für deren Verlauf von Einfluß sind.The invention is based on the idea that the reaction is only volatile of the aldehyde by dissolving it in suitable solvents, which reduce its volatility without letting the oxidation form compounds, which are of influence for their course. ;o Hierduich werden bei gesteigerter Temperatur reinere Produkte und bessere Ausbeuten erhalten. Als geeignete Verdünnungsmittel erweisen sich beispielsweise gechlorte Kohlenwasserstoffe. ; o Hierduich will be at increased temperature get purer products and better yields. Chlorinated hydrocarbons, for example, have proven to be suitable diluents. B e i s pi e 1.Example 1. In 10 kgTetrachlpraethan wird ι kg Acetaldehyd gelöst und durch diese Lösung Sauerstoff, bzw. sauerstoffhaltige Gasgemische (Luft), durchgepumpt, während man den Gasdruck in den Grenzen schwachen Überdruckes hält (1 bis 2 Atm.). Die Flüssigkeit wird auf ungefähr 70 bis 90° erwärmt. Man hält die Aldehydkonzentratiori zweckmäßig immer auf gleicher Höhe und trennt bei genügender Anreicherung an neugebildeter Essigsäure die Reste noch nicht oxydierten Aldehyds und die gewonnene Essigsäure durch fraktionierte ■ Destillation ab. Das Lösungsmittel geht in den Betrieb zurück. Etwaige geringe Mengen verdampfenden Aldehyds werden durch geeignete Kühl- und Waschvorrichtungen wieder gewonnen. Nach etwa 10 bis 15 Minuten ist der gesamte Aldehyd oxydiert. Die Ausbeuten sind sehr gut.In 10 kg Tetrachlpraethan ι kg of acetaldehyde is dissolved and oxygen, or oxygen-containing gas mixtures (air), pumped through while keeping the gas pressure holds within the limits of slight overpressure (1 to 2 atm.). The liquid will be on approximately 70 to 90 ° heated. The aldehyde concentration is always expediently stopped same amount and separates with sufficient enrichment on newly formed acetic acid the residues of not yet oxidized aldehyde and the acetic acid obtained is removed by fractional ■ distillation. The solvent goes in the company back. Any small amounts of vaporizing aldehyde are removed by suitable Cooling and washing facilities recovered. After about 10 to 15 minutes it is all of the aldehyde is oxidized. The yields are very good. Die Reaktion läßt sich auch in Türmen oder Kolonnen mit Füllmaterial im kontinuierlichen Betrieb ausführen.The reaction can also be carried out continuously in towers or columns with packing material Run operation. Paten τ-Anspruch:Sponsorship τ claim: Verfahren zur Herstellung von Essigsäure aus Acetaldehyd und Sauerstoff in Gegenwart eines Verdünnungsmittels, dadurch gekennzeichnet, daß man vor der Zuführung von Sauerstoff in Gegenwart ,oder Abwesenheit von Katalysatoren den Aldehyd in solchen seine Flüchtigkeit her absetzenden Flüssigkeiten auflöst, die mit dem Aldehyd keine Verbindung eingehen.Process for the production of acetic acid from acetaldehyde and oxygen in Presence of a diluent, characterized in that one before the Supply of oxygen in the presence or absence of catalysts Aldehyde dissolves in such liquids, which reduce its volatility, with do not combine with the aldehyde. (a. Auflage, ausgegeben am 23. August 1920.J(a. edition, issued on August 23, 1920
DENDAT301274D Active DE301274C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE766155C (en) * 1941-10-09 1954-08-16 Ruhrchemie Ag Process for the production of fatty acid metal compounds

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE766155C (en) * 1941-10-09 1954-08-16 Ruhrchemie Ag Process for the production of fatty acid metal compounds

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