DE816698C - Process for the preparation of halofluoroethylene - Google Patents

Process for the preparation of halofluoroethylene

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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
Application number
DEB351A
Other languages
German (de)
Inventor
Julius Dr Soell
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Priority to DEB351A priority Critical patent/DE816698C/en
Application granted granted Critical
Publication of DE816698C publication Critical patent/DE816698C/en
Expired legal-status Critical Current

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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

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  • 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)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung von Halogenfluoräthylenen durch Abspalten von Halogenwasserstoff aus wasserstoffhaltigen Halogenfluoräthanen mit alkalischen 'Mitteln, dadurch gekennzeichnet, daß die Abspaltung des Halogenwasserstoffs in Gegenwart von Wasser durchgeführt wird. PATENT CLAIMS: i. Process for the preparation of halofluoroethylenes by splitting off hydrogen halide from hydrogen-containing halofluoroethanes with alkaline agents, characterized in that the splitting off of the hydrogen halide is carried out in the presence of water. 2. Verfahren gemäß Anspruch i, dadurch gekennzeichnet, daß Erdalkalili_\Idroxyde als Halogenwasserstoff abspaltende Mittel verwendet werden.2. The method according to claim i, characterized characterized that Erdalkalili_ \ Idroxyde as an agent splitting off hydrogen halide be used.
DEB351A 1949-10-29 1949-10-29 Process for the preparation of halofluoroethylene Expired DE816698C (en)

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

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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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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