DE869057C - Process for the preparation of 2-AEthylhexanal-1 - Google Patents

Process for the preparation of 2-AEthylhexanal-1

Info

Publication number
DE869057C
DE869057C DEB7212D DEB0007212D DE869057C DE 869057 C DE869057 C DE 869057C DE B7212 D DEB7212 D DE B7212D DE B0007212 D DEB0007212 D DE B0007212D DE 869057 C DE869057 C DE 869057C
Authority
DE
Germany
Prior art keywords
ethylhexanal
catalysts
preparation
hydrogen
aethylhexanal
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
Application number
DEB7212D
Other languages
German (de)
Inventor
Erich Dr Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to DEB7212D priority Critical patent/DE869057C/en
Application granted granted Critical
Publication of DE869057C publication Critical patent/DE869057C/en
Expired legal-status Critical Current

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
    • C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/62—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by hydrogenation of carbon-to-carbon double or triple bonds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Verfahren zur Herstellung von 2-Athylhexanal-1 Es ist bekannt, daß man durch Behandeln von 2-Äthylhexen-2-al-i (a-Äthyl-ß,-propylacrolein) mit Wasserstoff bei verhältnismäßig hohen Temperaturen, gegebenenfalls unter Druck, in Gegenwart von nickelhaltigen Katalysatoren 2-Äthylhexanal-i (Äthyl-butyl-acetaldehyd) erhält. @ Die Ausbeuten sind hierbei nicht befriedigend, da erhebliche Mengen 2-Äthylhexanol-i und auch Kohlenwasserstoffe entstehen.Process for the preparation of 2-ethylhexanal-1 It is known that by treating 2-ethylhexen-2-al-i (a-ethyl-ß, -propylacrolein) with hydrogen at relatively high temperatures, optionally under pressure, in the presence 2-Ethylhexanal-i (ethyl-butyl-acetaldehyde) is obtained from nickel-containing catalysts. @ The yields here are not satisfactory, since considerable amounts of 2-ethylhexanol-i and hydrocarbons are also formed.

Es wurde nun gefunden, daß man. 2-Äthylhexanal-i in sehr guter Ausbeute erhält, wenn man 2-Äthylhexen-2-al-i mit Wasserstoff bei erhöhter Temperatur, beispielsweise bei 5o bis i5o°, zweckmäßig unter Druck, über Edelmetallkatalysatoren leitet. Diese Katalysatoren gestatten die Anwendung niedrigerer Temperaturen als Nickelkatalysatoren, nämlich schon solcher von' etwa i00'°' und sogar darunter. Die Katalysatoren., wie Platin oder Palladium, werden vorteilhaft auf Träger aufgetragen. Der Wasserstoff kann im t_lberschuß angewandt werden. Die Ausbeuten an a-Äthylhexanal-i erreichen nach einer kurzen Anlaufzeit von beispielsweise 24 Stunden 9o °/o der berechneten Mengen und .darüber. Nebenerzeugnisse entstehen nur in untergeordneter Menge.It has now been found that one. 2-Ethylhexanal-i in very good yield obtained when 2-ethylhexen-2-al-i with hydrogen at elevated temperature, for example at 5o to 15o °, expediently under pressure, passes over noble metal catalysts. These Catalysts allow the use of lower temperatures than nickel catalysts, namely already those of 'about 100' ° 'and even below. The catalysts. How Platinum or palladium are advantageously applied to supports. The hydrogen can be used in excess. Reach the yields of a-ethylhexanal-i after a short start-up period for example 24 hours 90 ° / o the calculated quantities and .above. By-products arise only in subordinate Lot.

Beispiel Über z 1 Kieselsäuregel, auf ,dem o,2 g Palladium niedergeschlagen sind, leitet man, bei 7o bis 8d° und 30o Atm. Wasserstoffdruck im Laufe von, 24 Stunden 4 bis 51 2-Äthylhexen-2-al-z. Nach einer gewissen Anlaufzeit erhält man, als Umsetzungserzeugnis 2-Äthylhexanal-r in einer Aus-, beute von 88 bis 9o o/o neben etwa 3 % unverändertem Ausgangsstoff. Der Rest besteht aus höhermolekularen Kondensationsprodukten und kleinen Mengen 2-Äthylhexanol-z. Die Lebensdauer des Katalysators beträgt mehrere Monate.EXAMPLE About z 1 silica gel on which 0.2 g of palladium was deposited are, one leads, at 7o to 8d ° and 30o Atm. Hydrogen pressure during, 24 Hours 4 to 51 2-ethylhexen-2-al-z. After a certain start-up time you get, as a conversion product of 2-ethylhexanal-r in a yield of 88 to 90 o / o in addition to about 3% unchanged starting material. The rest consists of higher molecular weight Condensation products and small amounts of 2-ethylhexanol-z. The lifetime of the Catalyst is several months.

Claims (1)

PATENTANSPRUCH:-Verfahrent zur Herstellung von 2-Äthylhexanal-r durch Überleiten von 2-Äthylhexen-2-al-z mit Wasserstoff bei erhöhter Temperatur, gegebenenfalls unter Druck, überKatalysatoren, dadurch gekennzeichnet, daß man in Gegenwart von Edelmetallkatalysatoren arbeitet.PATENT CLAIM: -Process for the production of 2-ethylhexanal-r by Passing 2-ethylhexen-2-al-z with hydrogen at elevated temperature, if necessary under pressure, over catalysts, characterized in that in the presence of Precious metal catalysts works.
DEB7212D 1943-02-11 1943-02-11 Process for the preparation of 2-AEthylhexanal-1 Expired DE869057C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB7212D DE869057C (en) 1943-02-11 1943-02-11 Process for the preparation of 2-AEthylhexanal-1

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB7212D DE869057C (en) 1943-02-11 1943-02-11 Process for the preparation of 2-AEthylhexanal-1

Publications (1)

Publication Number Publication Date
DE869057C true DE869057C (en) 1953-03-02

Family

ID=6955205

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB7212D Expired DE869057C (en) 1943-02-11 1943-02-11 Process for the preparation of 2-AEthylhexanal-1

Country Status (1)

Country Link
DE (1) DE869057C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS547766B1 (en) * 1970-02-21 1979-04-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS547766B1 (en) * 1970-02-21 1979-04-10

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