DE816992C - Process for the preparation of halofluoroethylene - Google Patents

Process for the preparation of halofluoroethylene

Info

Publication number
DE816992C
DE816992C DEB352A DEB0000352A DE816992C DE 816992 C DE816992 C DE 816992C DE B352 A DEB352 A DE B352A DE B0000352 A DEB0000352 A DE B0000352A DE 816992 C DE816992 C DE 816992C
Authority
DE
Germany
Prior art keywords
water
preparation
halogen
zinc dust
halofluoroethylene
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
DEB352A
Other languages
German (de)
Other versions
DE1628977U (en
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 DEB352A priority Critical patent/DE816992C/en
Application granted granted Critical
Publication of DE816992C publication Critical patent/DE816992C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/23—Preparation of halogenated hydrocarbons by dehalogenation

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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 Durch Behandlung von Chlorfluoräthanen mit einer Suspension von Zinkstaub in Alkoholen werden unter Abspaltung von Chlor Chlorfluoräthylene erhalten, z. B. gemäß der Gleichung CFZCl - CFCl2 -E- Zn + CH30H = CF2: CFCI -f- ZnCI, + CH,OH. Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung von Halogenfluoräthylenen aus Halonenfluoräthanen, die mindestens 2 Atome eines anderen Halogens als Fluor enthalten, durch Abspaltung vonChlor mit HilfevonMetall,vorzugsweise in fein verteilter Forin, wie z. B. Zinkstaub, in Gegenwart von Wasser. Es ist sehr überraschend, daß bei der Durchführung dieser Abspaltiingsreaktion in Gegenwart von Wasser kein Fluor abgespalten wird, obwohl die Gegenwart vom Wasser eine hohe Reaktionsfähigkeit des Metalls bewirkt. Die Bezeichnung Halogen soll im vorliegenden Fall unter Ausschluß von Fluor die eigentlichen Halogene, insbesondere Chlor und Brom, umfassen. Beispiel i In einem Rührkolben von 6 1 Inhalt werden 5oo g Zinkstaub mit 1,5 1 Wasser unter Erwärmen verrührt und allmählich 2 kg Trichlorfluoräthan eingetragen. Das entwickelte Fluorchloräthylen C Cl F : CH, wird durch einen mit Sole gekühlten Rückflußkühler von dem Trichlorfluoräthan getrennt. Beispiel 2 In einem 6-Liter-Rührkolben werden wie in Beispiel i Soo g Zinkstaub mit 1,5 1 Wasser verrührt und unter Erwärmen allmählich 2 kg Trichlortrifluoräthan C,C13F3 einlaufen gelassen. Das entwickelte Trifluorchloräthylen C FZ : C F Cl wird in einem mit Sole gekühlten RückfluBkühler von CQC13F3 befreit. Die Geschwindigkeit der Umsetzung kann durch Arbeiten unter schwachem Überdruck in ginem Autoklaven beschleunigt werden.Process for the preparation of halofluoroethylenes by treatment of chlorofluoroethanes with a suspension of zinc dust in alcohols are under Cleavage of chlorine chlorofluoroethylene obtained, for. B. according to the equation CFZCl - CFCl2 -E- Zn + CH30H = CF2: CFCI -f- ZnCl, + CH, OH. Subject of the present Invention is a process for the preparation of halofluoroethylenes from halonfluoroethanes, which contain at least 2 atoms of a halogen other than fluorine, by cleavage of chlorine with the help of metal, preferably in finely divided form, e.g. B. zinc dust, in the presence of water. It is very surprising when doing this Splitting reaction in the presence of water no fluorine is split off, although the presence of water makes the metal highly reactive. The designation In the present case, halogen, with the exclusion of fluorine, should represent the actual halogens, especially chlorine and bromine. Example i In a stirring flask with a capacity of 6 liters 500 g of zinc dust are stirred with 1.5 l of water while warming and gradually 2 kg of trichlorofluoroethane entered. The developed fluorochloroethylene C Cl F: CH, is separated from the trichlorofluoroethane by a reflux condenser cooled with brine. Example 2 In a 6 liter stirred flask, as in Example 1, soo g of zinc dust Stirred with 1.5 l of water and gradually add 2 kg of trichlorotrifluoroethane while warming C, C13F3 let in. The developed trifluorochloroethylene C FZ: C F Cl is in one CQC13F3 was removed from the reflux condenser cooled with brine. The speed of implementation can be accelerated by working under slight overpressure in a ginem autoclave.

Beispiel 3 In einem 6-Liter-Rührkolben werden wie in Beispiel i 400 g Zinkstaub und i 1 Wasser verrührt und unter Erwärmen i kg Trichlordifluoräthan C,HC1;F2 allmählich zugesetzt. Das entwickelte Chlordifluoräthylen C,F,CIH wird durch einen mit Sole gekühlten RückfluBkühler vom Ausgangsprodukt befreit.Example 3 In a 6 liter stirred flask, as in Example i 400 g zinc dust and i 1 water and stirred together with heating i kg trichlorodifluoroethane C, HC1; F2 gradually added. The developed chlorodifluoroethylene C, F, CIH is freed from the starting product by a reflux condenser cooled with brine.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellurg von Halogerfluoräthylenen aus Halogenfluoräthanen, die mindestens zwei Atome eines anderen Halogens als Fluorenthall en, durch Abspalten von Halogen durch ein Metall, vorzugsweise in fein verteilter Form, wie Zinkstaub, dadurch gekennzeichnet, daB die Abspaltung des Halogens in Gegenwart von Wasser durchgeführt wird. PATENT CLAIM: Process for the production of Halogerfluoroäthylenes from halofluoroethanes, which contain at least two atoms of a halogen other than Fluorenthall en, by splitting off halogen by a metal, preferably in finely divided form, such as zinc dust, characterized in that the splitting off of the halogen in the presence of water is carried out.
DEB352A 1949-10-29 1949-10-29 Process for the preparation of halofluoroethylene Expired DE816992C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB352A DE816992C (en) 1949-10-29 1949-10-29 Process for the preparation of halofluoroethylene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB352A DE816992C (en) 1949-10-29 1949-10-29 Process for the preparation of halofluoroethylene

Publications (1)

Publication Number Publication Date
DE816992C true DE816992C (en) 1951-10-15

Family

ID=6951813

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB352A Expired DE816992C (en) 1949-10-29 1949-10-29 Process for the preparation of halofluoroethylene

Country Status (1)

Country Link
DE (1) DE816992C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952713C (en) * 1953-07-14 1956-11-22 Bayer Ag Process for the preparation of olefins containing fluorine and hydrogen
DE1088046B (en) * 1954-11-23 1960-09-01 Minnesota Mining & Mfg Process for producing a fluorine-containing olefin
WO2003095401A1 (en) * 2002-05-13 2003-11-20 Bayer Cropscience Aktiengesellschaft Method for the production of substituted trifluoroethylenes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952713C (en) * 1953-07-14 1956-11-22 Bayer Ag Process for the preparation of olefins containing fluorine and hydrogen
DE1088046B (en) * 1954-11-23 1960-09-01 Minnesota Mining & Mfg Process for producing a fluorine-containing olefin
WO2003095401A1 (en) * 2002-05-13 2003-11-20 Bayer Cropscience Aktiengesellschaft Method for the production of substituted trifluoroethylenes

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