Method for producing chlorofluorobutane (cfb)
AssigneeKanto Denka Kogyo Co., Ltd.
InventorsSho KIKUCHI, Yohei OKUYAMA, Kazuki KISHI
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Abstract
There is provided a method for producing chlorofluorobutane (CFB) by forming chlorinated butadiene by dimerizing trichloroethylene (TCE) and fluorinating hydrogen atoms of the chlorinated butadiene. Trichloroethylene (TCE) is dimerized by using a dimer represented by the following formula (1) as a solvent and in the presence of a free radical generating agent at a temperature of 100° C. or higher. Hexachlorobutadiene (C4Cl6) is produced from the above dimer by chlorination and dehydrochlorination reaction, and further, the chlorofluorobutane (CFB) is produced by fluorinating the hexachlorobutadiene.
Claims10
A method for producing a dimer of trichloroethylene (TCE) represented by the following formula (1):
- from TCE, the method comprising a step of allowing TCE to dimerize by using a dimer represented by formula (1) as a solvent at a temperature of 100° C. or higher in the presence of a free radical generating agent.
A method for producing hexachlorobutadiene (C4Cl6) by chlorination and dehydrochlorination reaction from a dimer of trichloroethylene (TCE) represented by the following formula (1):
- wherein the method comprises a step of reacting the dimer of TCE with chlorine gas (Cl2) in the presence of a Lewis acid catalyst.
A method for producing 1,2,3,4-tetrachloro-1, 1,2,3,4,4-hexafluorobutane from trichloroethylene (TCE), comprising:
- step (A) of producing a dimer of trichloroethylene (TCE) represented by the following formula (1):
- from TCE, wherein step (A) comprises allowing TCE to dimerize by using a dimer represented by formula (1) as a solvent at a temperature of 100° C. or higher in the presence of a free radical generating agent;
- step (B) of producing hexachlorobutadiene (C4Cl6) by chlorination and dehydrochlorination reaction from the dimer of TCE represented by the above formula (1), wherein step (B) comprises reacting the dimer of TCE with chlorine gas (Cl2) in the presence of FeCl3 as a reaction catalyst;
- step (C) of producing a fluorinated product comprising 1,1,2,3,4,4-hexachloro-1,2,3,4-tetrafluorobutane by fluorinating the hexachlorobutadiene (C4Cl6) with a fluorinating agent;
- and
- step (D) of producing 1,2,3,4-tetrachloro-1,1,2,3,4,4-hexafluorobutane by reacting the fluorinated product obtained in step (C) with chlorine monofluoride (ClF).
Dependencies are inferred from the claim text.