An object of the present disclosure is to provide a method for dehydrating a composition containing a fluorine-based hydrocarbon compound, such as HFC-134a. The dehydration method includes the step of bringing a composition containing a fluorine-based hydrocarbon compound into contact with a zeolite.

A method of producing trifluoroiodomethane (CF.sub.3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI.sub.3) and iodine (I.sub.2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream. Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

A method of producing trifluoroiodomethane (CF.sub.3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI.sub.3) and iodine (I.sub.2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream. Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

A method of producing trifluoroiodomethane (CF.sub.3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI.sub.3) and iodine (I.sub.2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream. Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

The invention relates to a two-stage method for recovering halogenated hydrocarbons. In a desorption step, steam is passed through an adsorbent comprising adsorbed halogenated hydrocarbons, which produces a secondary flow volume containing halogenated hydrocarbons. The secondary flow volume is converted into a condensate containing halogenated hydrocarbons and water by cooling, from which condensate the halogenated hydrocarbons are separated. In a sterilisation step that precedes the desorption step, the adsorbent comprising adsorbed halogenated hydrocarbons is brought into contact with steam for at least 10 minutes at a temperature of more than 120° C. and at a pressure between 0.15 MPa and 0.4 MPa.

The invention relates to a two-stage method for recovering halogenated hydrocarbons. In a desorption step, steam is passed through an adsorbent comprising adsorbed halogenated hydrocarbons, which produces a secondary flow volume containing halogenated hydrocarbons. The secondary flow volume is converted into a condensate containing halogenated hydrocarbons and water by cooling, from which condensate the halogenated hydrocarbons are separated. In a sterilisation step that precedes the desorption step, the adsorbent comprising adsorbed halogenated hydrocarbons is brought into contact with steam for at least 10 minutes at a temperature of more than 120° C. and at a pressure between 0.15 MPa and 0.4 MPa.

A method of producing trifluoroiodomethane (CF.sub.3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI.sub.3) and iodine (I.sub.2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream.

Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

A method of producing trifluoroiodomethane (CF.sub.3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI.sub.3) and iodine (I.sub.2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream.

Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

A method of producing trifluoroiodomethane (CF.sub.3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI.sub.3) and iodine (I.sub.2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream.

Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column charged with carbonaceous materials to remove hydrogen iodide (HI), hydrogen triiodide (HI3) and iodine (I2) from the trifluoroiodomethane product stream.

The present disclosure provides a method for purifying HFO-1132 to a high purity while suppressing the isomerization and loss of HFO-1132. Specifically, the present disclosure provides a method for purifying 1,2-difluoroethylene, which is HFO-1132, the method comprising, in this order, step 1 of bringing a composition comprising trans-1,2-difluoroethylene, which is HFO-1132(E), and water into contact with a zeolite having an average pore size of 2 to 4 Å to reduce the water content from the composition; and step 2 of recovering a purified product containing HFO-1132(E) and a reduced content of water, and containing less than 0.1% by volume of HFO-1132(Z).