DE816698C - Process for the preparation of halofluoroethylene - Google Patents
Process for the preparation of halofluoroethyleneInfo
- Publication number
- DE816698C DE816698C DEB351A DEB0000351A DE816698C DE 816698 C DE816698 C DE 816698C DE B351 A DEB351 A DE B351A DE B0000351 A DEB0000351 A DE B0000351A DE 816698 C DE816698 C DE 816698C
- Authority
- DE
- Germany
- Prior art keywords
- preparation
- splitting
- halofluoroethylene
- hydrogen
- water
- 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
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/25—Preparation of halogenated hydrocarbons by splitting-off hydrogen halides from halogenated hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung von Halogenfluoräthylenen Clilorfltior'ithvlene werden häufig aus Chlorfluor2thanen durch Abspalten von Chlorwasserstoff mit alkoholischer Natronlauge gewonnen, z. B. gemäß der Gleichung: CCI2F - CHCI, + NaOH + CH30H =Cl FC:CC1_,-@NaCl+H,O+CH30H Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung von Halogenfluoräthylenen durch Abspalten von Halogenwasserstoff aus wasserstoffhaltigen Halogenfluoräthanen mit AI-kalilauge oder vorzugsweise Erdalkali@hydroxyden in Gegenwart von Wasser. Die Bezeichnung Halogen soll im vorliegenden Fall unter Ausschluß von Fluor die eigentlichen Halogene, insbesondere Chlor und Brom, umfassen. Es ist eine überraschende Tatsache, daß hierbei kein Fluorwasserstoft abgespalten wird, obwohl die Gegenwart von Wasser eine hohe Reaktionsfähigkeit der alkalischen Mittel bewirkt.Process for the production of Halogenfluoräthylenes Clilorfltior'ithvlene are often made from chlorofluorothanes by splitting off hydrogen chloride with alcoholic Caustic soda obtained, e.g. B. according to the equation: CCI2F - CHCI, + NaOH + CH30H = Cl FC: CC1 _, - @ NaCl + H, O + CH30H The present invention relates to a method for the preparation of halofluoroethylenes by splitting off hydrogen halide from hydrogen-containing halofluoroethanes with Al potassium hydroxide or preferably alkaline earth hydroxides in the presence of water. The term halogen is intended in the present case under Exclusion of fluorine includes the actual halogens, in particular chlorine and bromine. It is a surprising fact that no hydrogen fluoride is split off will, although the presence of water has a high reactivity of the alkaline Means causes.
Beispiel i 200 g Calciumoxyd werden in einem 6-Liter-Rührkolben mit 11 kochendem Wasser gelöscht und durch einen Tropfrichter i kg Fluortetrachloräthan Cz F H C14 anteilsweise zugegeben, wobei der Rührkolben auf Siedetemperatur geheizt wird. Das entstehende, bei 71 bis 72° siedende Fluortrichloräthylen wird durch einen Widmerdestillationsaufsatz abdestilliert.Example i 200 g of calcium oxide are in a 6 liter stirred flask with 11 quenched boiling water and i kg fluorotetrachloroethane through a dropping funnel Cz F H C14 were added proportionally, the stirred flask being heated to boiling temperature will. The resulting fluorotrichlorethylene, boiling at 71 to 72 °, is replaced by a Widmer distillation attachment distilled off.
Beispiel e 200g Calciumoxyd werden wie in Beispiel i mit kochendem Wasser gelöscht und anteilweise i kg i, i, 2-Trichlor-2-fluoräthan in der Hitze zugegeben. Das entstehende Fluordichloräthylen wird durch einen Widmerdestillationsaufsatz abdestilliert.Example e 200g calcium oxide are as in example i with boiling Water quenched and partially i kg i, i, 2-trichloro-2-fluoroethane in the heat admitted. The resulting fluorodichlorethylene is by a Widmer distillation attachment distilled off.
Beispiel 3 In einem 6-Liter-Autoklaven mit schnell laufendem Rührer werden 5oo g Calciumoxyd mit 2 1 kochendem Wasser gelöscht, 3 kg Trichlorfluoräthan C HZ Cl C F C12 zugesetzt, das trichloräthylenhaltig sein kann, und der Autoklav verschlossen. Dann wird unter Rühren 8 Stunden lang auf 12o bis 14o° geheizt und schließlich das entstandene Fluordichloräthylen, das nach der Reinigung bei 36 bis 37° siedet, abdestilliert.Example 3 In a 6 liter autoclave with a high-speed stirrer 5oo g of calcium oxide are extinguished with 2 liters of boiling water, 3 kg of trichlorofluoroethane C HZ Cl C F C12 added, which may contain trichlorethylene, and the autoclave locked. The mixture is then heated to 12o to 14o ° for 8 hours while stirring finally the resulting fluorodichlorethylene, which after cleaning at 36 to 37 ° boils, distilled off.
Beispiel 4 Zoo g Calciumoxyd werden in einem 6-Liter-Rührkolben mit 1 1 kochendem Wasser wie in Beispiel i gelöscht und unter Rühren und Erwärmen i kg Trichlordifluoräthan C2 H C13 FZ anteilsweise eingetragen. Das entwickelte Dichlordifluoräthylen wird durch Destillation mit einem Widmerdestillationsaufsatz gereinigt.Example 4 Zoo g of calcium oxide are used in a 6 liter stir flask 1 1 boiling water as in Example i and deleted with stirring and heating i kg trichlorodifluoroethane C2 H C13 FZ entered proportionally. That developed dichlorodifluoroethylene is purified by distillation with a Widmer distillation attachment.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB351A DE816698C (en) | 1949-10-29 | 1949-10-29 | Process for the preparation of halofluoroethylene |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB351A DE816698C (en) | 1949-10-29 | 1949-10-29 | Process for the preparation of halofluoroethylene |
Publications (1)
Publication Number | Publication Date |
---|---|
DE816698C true DE816698C (en) | 1951-10-11 |
Family
ID=6951812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB351A Expired DE816698C (en) | 1949-10-29 | 1949-10-29 | Process for the preparation of halofluoroethylene |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE816698C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0010672A1 (en) * | 1978-10-27 | 1980-05-14 | Bayer Ag | Process for the preparation of 1-fluoro-1,2- dichloroethylene by dehydrochlorination of 1-fluoro-1,1,2-trichloroethane |
-
1949
- 1949-10-29 DE DEB351A patent/DE816698C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0010672A1 (en) * | 1978-10-27 | 1980-05-14 | Bayer Ag | Process for the preparation of 1-fluoro-1,2- dichloroethylene by dehydrochlorination of 1-fluoro-1,1,2-trichloroethane |
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