AT58733B - Process for the preparation of isoprene from as-dimethylallene. - Google Patents
Process for the preparation of isoprene from as-dimethylallene.Info
- Publication number
- AT58733B AT58733B AT58733DA AT58733B AT 58733 B AT58733 B AT 58733B AT 58733D A AT58733D A AT 58733DA AT 58733 B AT58733 B AT 58733B
- Authority
- AT
- Austria
- Prior art keywords
- isoprene
- dimethylallene
- preparation
- vacuum
- alumina
- Prior art date
Links
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 4
- 238000002360 preparation method Methods 0.000 title claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Darstellung von Isopren aus as-Dimethylallen.
Leitet man as-Dimethylallen bei höherer Temperatur und, um die Bildung polymerer Kohlenwasserstoffe zu vermeiden, zweckmässig im Vakuum über geeignete Kontaktsubstanzen, so tritt, wie gefunden wurde, eine Verschiebung der Doppelbindungen im Molekül ein und es lagert sich das Demithylallen in das isomere Isopren nm. Als für diese Umlagerung besonders geeignet haben sich Tonerde verschiedenster Herkunft und tonerdehaltige Materialien erwiesen.
Beispiel :
Ein mit Tonerde in Stücken beschicktes, auf etwa 3000 C heizbares Rohr ist einer- seits mit piner Zutropfvorrichtung, andererseits mit durch Kohlensäureäther kühlbaren Vorlagen und durch diese mit einer Vakuumpumpe verbunden. Nach dem Evakuieren und Erhitzen lässt man Dimethylallen (Siedepunkt 39 bis 410 C) zutropfen, dass ein Vakuum von 20 bis 30 111m bestehen bleibt. In den Vorlagen kondensiert sich fast reines Isopren vom Siedepunkt 32 bis 340 C.
Analog kann man verfahren, wenn man statt des Vakuums von 20 bis 30 mm nur teilweise verminderten oder gewöhnlichen Druck anwendet, doch ist dies weniger vorteilhaft, indem leicht Zersetzung eintritt, die beim Arbeiten Im Vakuum nicht oder kaum erfolgt.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for the preparation of isoprene from as-dimethylallene.
If as-dimethylallene is passed at a higher temperature and, in order to avoid the formation of polymeric hydrocarbons, expediently in a vacuum via suitable contact substances, a shift in the double bonds in the molecule occurs, as has been found, and the demithylallene is deposited in the isomeric isoprene nm Alumina of various origins and alumina-containing materials have proven to be particularly suitable for this rearrangement.
Example:
A tube filled with alumina in pieces and heatable to about 3000 C is connected on the one hand to a pin dropping device, on the other hand to templates that can be cooled by carbonic acid ether and through this to a vacuum pump. After evacuation and heating, dimethylallene (boiling point 39 to 410 C) is added dropwise so that a vacuum of 20 to 30 111m remains. Almost pure isoprene with a boiling point of 32 to 340 C. condenses in the templates.
An analogous procedure can be used if, instead of the vacuum of 20 to 30 mm, only partially reduced or normal pressure is used, but this is less advantageous as decomposition easily occurs, which does not or hardly takes place when working in a vacuum.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE58733X | 1911-05-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT58733B true AT58733B (en) | 1913-04-25 |
Family
ID=5629692
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT58733D AT58733B (en) | 1911-05-12 | 1912-02-12 | Process for the preparation of isoprene from as-dimethylallene. |
| AT62970D AT62970B (en) | 1911-05-12 | 1913-01-13 | Process for the preparation of isoprene. |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT62970D AT62970B (en) | 1911-05-12 | 1913-01-13 | Process for the preparation of isoprene. |
Country Status (1)
| Country | Link |
|---|---|
| AT (2) | AT58733B (en) |
-
1912
- 1912-02-12 AT AT58733D patent/AT58733B/en active
-
1913
- 1913-01-13 AT AT62970D patent/AT62970B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| AT62970B (en) | 1914-01-10 |
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