AT55394B - Process for the preparation of 2,3-dimethyl-1,3-butadien. - Google Patents

Process for the preparation of 2,3-dimethyl-1,3-butadien.

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Publication number
AT55394B
AT55394B AT55394DA AT55394B AT 55394 B AT55394 B AT 55394B AT 55394D A AT55394D A AT 55394DA AT 55394 B AT55394 B AT 55394B
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AT
Austria
Prior art keywords
dimethyl
preparation
butadien
pinacon
dehydrating
Prior art date
Application number
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German (de)
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Basf Ag
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Publication of AT55394B publication Critical patent/AT55394B/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung von 2. 3-Dimethyl-1. 3-butadien. 



   Es ist bekannt, dass Pinakon beim Durchleiten durch ein schwach rotglühendes, mit Glasstücken gefülltes Rohr in Azeton und Isopropylalkohol gespalten wird   (vergl. Ber. 13,   S. 645, Abs. 3), dass dagegen unter dem   Einfluss   kochender, verdünnter Schwefelsäure aus Pinakon unter Wasserabspaltung 2.   3-Dimethyi-1. 3-butadiën (Diisopropenyl) entsteht   
 EMI1.1 
 beute an Dimethylbutadiën hiebei nur sehr gering. 



   Es hat sich nun gezeigt, dass sich das Pinakon und ebenso auch das Pinakolin in ausgezeichneter Weise in 2. 3-Dimethyl-1. 3-butadiën   überführen   lassen, wenn man dieselben mit solchen wasserabspaltenden, katalytischen Substanzen erhitzt, die kein oder nur wenig   bydratisch   gebundenes Wasser enthalten, wie z. B. die wasserabspaltenden, katalytischen Oxyde, Tonerde in verschiedenen Formen, blaues Wolframoxyd, Thoroxyd und dgl. 



   B e i s pie 1 : Pinakon oder Pinakolin werden über auf etwa 4000 C erhitzte Ton-   erdestückehen   destilliert. In der Vorlage scheidet sich   neben dei abgespaltenen   Wasser ein niedrig siedendes Produkt ab, welches bei der fraktionierten Destillation über   70'"   der Theorie an   2. 3-Dimethyl-1. 3-butadiën   vom Siedepunkt   69    C liefert. 



   Analog verfährt man bei Verwendung anderer katalytischer Substanzen der erwähnten Art. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the preparation of 2. 3-dimethyl-1. 3-butadiene.



   It is known that pinacon is split into acetone and isopropyl alcohol when it is passed through a slightly red-hot pipe filled with pieces of glass (cf. Ber. 13, p. 645, paragraph 3), whereas pinacon is split under the influence of boiling, dilute sulfuric acid with elimination of water 2. 3-dimethyl-1. 3-butadien (diisopropenyl) is formed
 EMI1.1
 The prey on dimethylbutadien is only very small.



   It has now been shown that pinacon and also pinacolin can be converted into 2. 3-dimethyl-1. 3-butadiën can be transferred if the same is heated with such dehydrating, catalytic substances that contain no or only little bydratisch bound water, such as. B. the dehydrating, catalytic oxides, alumina in various forms, blue tungsten oxide, thoroxide and the like.



   Example 1: Pinakon or Pinakolin are distilled over pieces of clay heated to about 4000 ° C. In addition to the water that has been split off, a low-boiling product separates in the receiver, which, in the case of fractional distillation over 70 '"of theory, delivers 3-dimethyl-1,3-butadiene with a boiling point of 69 ° C.



   The same procedure is used when using other catalytic substances of the type mentioned.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Darstellung von 2.3-Dimethyl-1. 3-butadiën unter Behandlung von Pinakon mit wasserabspaltenden, katalytischen Substanzen, darin bestehend, dass man Pinakon oder Pinakolin mit wasserabspaltenden, katalytischen Oxyden erhitzt. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the preparation of 2,3-dimethyl-1. 3-butadiën under treatment of pinacon with dehydrating, catalytic substances, consisting in that pinacon or pinacolin is heated with dehydrating, catalytic oxides. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT55394D 1910-02-11 1910-08-09 Process for the preparation of 2,3-dimethyl-1,3-butadien. AT55394B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE55394X 1910-02-11

Publications (1)

Publication Number Publication Date
AT55394B true AT55394B (en) 1912-09-10

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ID=5628377

Family Applications (1)

Application Number Title Priority Date Filing Date
AT55394D AT55394B (en) 1910-02-11 1910-08-09 Process for the preparation of 2,3-dimethyl-1,3-butadien.

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AT (1) AT55394B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441966A (en) * 1942-12-16 1948-05-25 Nat Agrol Company Inc Dehydration process and catalyst

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441966A (en) * 1942-12-16 1948-05-25 Nat Agrol Company Inc Dehydration process and catalyst

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