79-38-9 Usage
Description
Chlorotrifluoroethylene is a colorless gas with a faint ethereal odor, which is very toxic by inhalation and easily ignited. It is shipped as a liquefied gas under its vapor pressure and can cause asphyxiation due to the displacement of air by its vapors. Contact with the liquid can cause frostbite, and prolonged exposure to intense heat or fire may lead to violent rupture and rocketing of the containers or polymerization with possible container rupture.
Uses
Used in Chemical Industry:
Chlorotrifluoroethylene is used as an intermediate and monomer for chlorotrifluoroethylene resins. It is a key component in the production of various types of polymers, which have a wide range of applications in different industries.
Used in Polymer Production:
Chlorotrifluoroethylene is used as a monomer in the synthesis of polymers, such as polychlorotrifluoroethylene (PCTFE). These polymers exhibit excellent chemical resistance, thermal stability, and non-stick properties, making them suitable for various applications, including chemical processing equipment, electrical insulation, and non-stick coatings.
Used in Fluoroelastomers:
Chlorotrifluoroethylene is also used in the production of fluoroelastomers, which are a class of synthetic rubbers with exceptional resistance to heat, chemicals, and weathering. These elastomers are widely used in the automotive, aerospace, and chemical processing industries for seals, gaskets, and other components that require high-performance properties.
Used in Coatings and Linings:
Chlorotrifluoroethylene-based polymers are used in the formulation of coatings and linings for various applications, such as chemical storage tanks, pipelines, and protective coatings for metal surfaces. These coatings provide excellent corrosion and chemical resistance, as well as non-stick properties, making them ideal for use in harsh environments.
Used in Electrical Insulation:
Due to their excellent dielectric properties, chlorotrifluoroethylene-based polymers are used as insulating materials in electrical applications, such as wire and cable insulation, transformers, and capacitors. These materials offer high temperature resistance, excellent electrical insulation, and good mechanical properties, making them suitable for use in various electrical systems.
Preparation
Chlorotrifluoroethylene is prepared from ethylene by the following route:Ethylene is treated with an excess of chlorine at 300-350°C in the presence of
activated charcoal to give hexachloroethane. This product is then treated
with hydrogen fluoride in the presence of antimony pentachloride to yield
trichlorotrifluoroethane. Dechlorination in the liquid phase with zinc dust
and ethanol results in the formation of chlorotrifluoroethylene which is
washed with water to remove alcohol, dried and distilled under pressure.
Air & Water Reactions
Highly flammable.
Reactivity Profile
Halogenated aliphatic compounds, such as Chlorotrifluoroethylene, are moderately or very reactive. Reactivity generally decreases with increased degree of substitution of halogen for hydrogen atoms. Low molecular weight haloalkanes are highly flammable and can react with some metals to form dangerous products. Materials in this group are incompatible with strong oxidizing and reducing agents. Also, they are incompatible with many amines; nitrides; azo/diazo compounds; alkali metals; strong oxidizers such as chlorine perchlorate, oxygen, bromine; and epoxides.
Hazard
Dangerous fire risk. Flammable limits in
air 8.4–38.7%.
Health Hazard
Inhalation causes dizziness, nausea, vomiting; liver and kidney injury may develop after several hours and cause jaundice and necrosis of the kidney. Contact with liquid causes frostbite of eyes and possibly of skin.
Flammability and Explosibility
Extremelyflammable
Safety Profile
Poison by ingestion and
intraperitoneal routes. Moderately toxic by
inhalation. Very dangerous fire hazard when
exposed to heat, flames (sparks), or
oxidizers. To fight fire, stop flow of gas.
Violent reaction when mixed with (Brz +
02) or (CIF3 + water). Potentially explosive
polymerization reaction with ethylene.
Incompatible with 1,l -dchloroethylene;
oxygen. When heated to decomposition it
emits toxic fumes of Fand Cl-. See also
CHLORINATED HYDROCARBONS,
ALIPHATIC; and FLUORIDES.
Purification Methods
Scrub it with 10% KOH solution, then 10% H2SO4 solution to remove inhibitors, dry and pass it through silica gel. It is stabilized with ~1% tributylamine. Use brass equipment. [Beilstein 1 III 646.] TOXIC GAS.
Check Digit Verification of cas no
The CAS Registry Mumber 79-38-9 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 7 and 9 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 79-38:
(4*7)+(3*9)+(2*3)+(1*8)=69
69 % 10 = 9
So 79-38-9 is a valid CAS Registry Number.
InChI:InChI=1/C2ClF3/c3-1(4)2(5)6
79-38-9Relevant articles and documents
Tyerman, W. J. R.
, p. 1188 - 1198 (1969)
Gas phase process for chlorotrifluoroethylene
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Page/Page column 12; 17, (2020/07/15)
Disclosed are processes for the dechlorination of haloethanes comprising reacting in the gaseous phase a haloethane and reducing agent such as an alkene, an alkane, hydrogen or combinations of two or more of these, in the presence of a silicon-based catalyst.
Novel green chlorotrifluoroethylene preparation method
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Paragraph 0022; 0023, (2017/03/17)
A process for preparing trifluorochloroethylene including: in a multi-tubular reactor, hydrogenation reacting 1,1,2-trifluoro-1,2,2-trichloroethane directly with a catalyst potassium zinc trihydride to obtain trifluorochloroethylene, wherein the catalytic reaction is performed at a temperature of 250-350° C. and a pressure of 0.7-1.0 MPa for 10-20 seconds. The conventional process in which zinc powder is used for dechlorination or hydrogen is used for dechlorination through hydrogenation with the action of a noble metal catalyst is avoided in the process disclosed herein. The present process substantially reduces the production cost of trifluorochloroethylene, and substantially increases the product yield, which can be up to 99% or more.
At the same time, preparation of trifluoro-vinyl chloride and tetrafluoroethylene, and method
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Paragraph 0054; 0055, (2017/03/22)
The invention discloses a method for simultaneously preparing trifluorochloroethylene and tetrafluoroethylene. The method comprises the following steps: mixing monochlorodifluoromethane, dichlorofluoromethane and a diluent, performing copyrolysis reaction to generate pyrolysis gas, quickly cooling, washing by water and alkali in sequence, drying, compressing, rectifying and purifying to obtain trifluorochloroethylene and tetrafluoroethylene, wherein the molar ratio of monochlorodifluoromethane to dichlorofluoromethane is 1 to (1-4), the molar ratio of the diluent to the total amount of monochlorodifluoromethane and dichlorofluoromethane is 1 to (1-20), the reaction temperature is 500-1,200 DEG C, the reaction pressure is 0.1-1MPa, and the reaction retention time is 0.01-10 seconds. The method has the advantages of being simple in process, easy for industrialization and environment-friendly, and raw materials are easily available.