CH256846A - Process for the preparation of a fluoroalkylene. - Google Patents

Process for the preparation of a fluoroalkylene.

Info

Publication number
CH256846A
CH256846A CH256846DA CH256846A CH 256846 A CH256846 A CH 256846A CH 256846D A CH256846D A CH 256846DA CH 256846 A CH256846 A CH 256846A
Authority
CH
Switzerland
Prior art keywords
fluoroalkylene
preparation
starting material
pyrolysis
alloy
Prior art date
Application number
Other languages
German (de)
Inventor
Inc Kinetic Chemicals
Original Assignee
Inc Kinetic Chemicals
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 Inc Kinetic Chemicals filed Critical Inc Kinetic Chemicals
Publication of CH256846A publication Critical patent/CH256846A/en

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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 eines     Fluoralkylens.       Gegenstand der Erfindung ist     ein    Ver  fahren zur     Herstellung    des an sich bekann  ten     Fluoralkylens    der Formel     CHz    =     CF_     durch Pyrolyse des     Fluorchloralkyls    der For  mel<B>CH,</B>     #    C Cl     F'2.        Unter    Pyrolyse     wird    die  Umwandlung des Ausgangsstoffes durch die  Einwirkung von Hitze verstanden.  



  Zweckmässig wird das Verfahren durch       kontinuierliches    Durchleiten des Ausgangs  materials durch ein auf die     pyrolytisch    wirk  same Temperatur erhitztes Rohr durchge  führt.     Dass    Rohr besteht vorteilhaft aus  einem     Material,    welches     gegenüber    der Re  aktion und den Reaktionsprodukten     inert    ist.  Besonders geeignet ist ein Nickelrohr, wel  ches: auf der Innenseite mit einem Platin  belag versehen ist und auf der Aussenseite  einen Mantel aufweist, der aus einer Legie  rung von etwa 80 % Ni, 14 %     Cr        und    6 % Fe  besteht. Die bevorzugte Temperatur für die  Pyrolyse liegt ungefähr bei 715  C.  



  Der durch das neue Verfahren her  gestellte Stoff kann zur Herstellung von       Polymeren    und     gopolymeren    für Spezial  filme verwendet werden.  



       Beispiel:          CHg        #    C Cl F, wurde in einer Menge von  120 g pro Stunde durch ein Nickelrohr ge  leitet, das einen     innern    Platinbelag und einen  äussern     Schutzmantel    aus einer Legierung    aus etwa 80     %    Ni, 14     %    -     Cr    und 6 % Fe. auf  wies und dessen Länge 108 cm und dessen       Innendurchmesser    13,7     mm    betrug. Durch  elektrische Heizung wurde über eine Länge  von schätzungsweise 200 mm eine Temperatur  von 715  C aufrechterhalten.

   Die Reaktions  produkte wurden mit Wasser gewaschen, ge  trocknet und in zwei Vorlagen     kondensiert.     Die erste Vorlage wurde auf     ungefähr     - 70  C gekühlt, während die zweite Vor  lage in einem aus flüssigem     Stickstoff    be  stehenden Bad gekühlt     wurde.    Wie durch  Säurebestimmung     im        .Waschwasser    festge  stellt wurde, betrug die Umwandlung unge  fähr 50 % des Ausgangsmaterials.

   Die Pyro  lyse verlief glatt unter Bildung von prak  tisch reinem<B>CH,</B> =     CFZ        mit    einem Siede  punkt von -     83,9     C und einer Dampfdichte  von 2,58 g pro Liter bei     28     C und 756 mm  Druck.



  Process for the preparation of a fluoroalkylene. The invention relates to a process for the preparation of the known fluoroalkylene of the formula CHz = CF_ by pyrolysis of the fluorochloroalkyl of the formula <B> CH, </B> # C Cl F'2. Pyrolysis is the conversion of the starting material through the action of heat.



  The process is advantageously carried out by continuously passing the starting material through a tube heated to the pyrolytically effective temperature. The tube is advantageously made of a material which is inert to the reaction and the reaction products. Particularly suitable is a nickel tube which is provided with a platinum coating on the inside and has a jacket on the outside which consists of an alloy of about 80% Ni, 14% Cr and 6% Fe. The preferred temperature for pyrolysis is around 715 C.



  The fabric produced by the new process can be used to manufacture polymers and copolymers for special films.



       Example: CHg # C Cl F, was passed through a nickel tube in an amount of 120 g per hour, which had an inner platinum coating and an outer protective jacket made of an alloy of about 80% Ni, 14% Cr and 6% Fe. and its length was 108 cm and its inner diameter was 13.7 mm. A temperature of 715 ° C was maintained by electrical heating over a length of approximately 200 mm.

   The reaction products were washed with water, dried and condensed in two templates. The first template was cooled to about -70 C, while the second template was cooled in a bath consisting of liquid nitrogen. As was found by determining the acid in the washing water, the conversion was approximately 50% of the starting material.

   The pyrolysis proceeded smoothly with the formation of practically pure <B> CH, </B> = CFZ with a boiling point of - 83.9 C and a vapor density of 2.58 g per liter at 28 C and 756 mm pressure.

Claims (1)

PATENTANSPRUCH: Verfahren, zur Herstellung des Fluor- alkylens der Formel<B>CH,</B> = C F"2, dadurch gekennzeichnet, dass die Verbindung CH, -<B>C Cl</B> F2 der Pyrolyse unterworfen wird. UNTERANSPRüCHE: 1. Claim: Process for the preparation of the fluoroalkylene of the formula <B> CH, </B> = CF "2, characterized in that the compound CH, - <B> C Cl </B> F2 is subjected to pyrolysis. SUBCLAIMS: 1. Verfahren nach Patentanspruch, da durch gekennzeichnet, dass das Ausgangs- material<B>-</B>auf eine Temperatur von etwa 715' C erhitzt wird. 2,. Verfahren gemäss Patentanspruch, da durch gekennzeichnet, dass das Ausgangs material durch ein Nickelrohr mit einem innern Platinbelag und einem Schutzmantel aus einer Legierung aus Ni, Cr und Fe ge leitet wird. Method according to patent claim, characterized in that the starting material <B> - </B> is heated to a temperature of about 715 ° C. 2 ,. Method according to claim, characterized in that the starting material is passed through a nickel tube with an internal platinum coating and a protective jacket made of an alloy of Ni, Cr and Fe.
CH256846D 1942-03-17 1945-10-27 Process for the preparation of a fluoroalkylene. CH256846A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US256846XA 1942-03-17 1942-03-17

Publications (1)

Publication Number Publication Date
CH256846A true CH256846A (en) 1948-09-15

Family

ID=21827485

Family Applications (1)

Application Number Title Priority Date Filing Date
CH256846D CH256846A (en) 1942-03-17 1945-10-27 Process for the preparation of a fluoroalkylene.

Country Status (1)

Country Link
CH (1) CH256846A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2783821A1 (en) * 1998-09-03 2000-03-31 Atochem Elf Sa Process for the manufacture of vinylidine fluoride and 1,2-difluroethylene by the pyrolysis of 1-chloro-2,2-difluoroethane in a reactor of which the metallic walls function as a catalyst

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2783821A1 (en) * 1998-09-03 2000-03-31 Atochem Elf Sa Process for the manufacture of vinylidine fluoride and 1,2-difluroethylene by the pyrolysis of 1-chloro-2,2-difluoroethane in a reactor of which the metallic walls function as a catalyst

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