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US 5,672,785 AGranted
Process for producing 1,1-dichloro-12,2,2-tetrafluoroethane
AssigneeAsahi Glass Company, Limited
InventorsShinsuke Morikawa, Shunichi Samejima, Masaru Yoshitake, Shin Tatematsu
Life of this patent
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Abstract
A process for producing 1,1-dichloro-1,2,2,2-tetrafluoroethane, which comprises isomerizing 1,1,2-trichloro-1,2,2-trifluoroethane to form 1,1,1-trichloro-2,2,2-trifluoroethane, followed by fluorination with hydrofluoric acid.
Claims14
A process for producing 1,1-dichloro-1,2,2,2- tetrafluoroethane, which comprises:
- 1) isomerizing and disproportionating 1,1,2-trichloro-1,2,2-trifluoroethane to form a mixture comprising 1,1,1-trichloro-2,2,2-trifluoroethane, 1,1,1,2-tetrachloro-2,2-difluoroethane and 1,1-dichloro-1,2,2,2-tetrafluoroethane;
- 2) introducing said mixture from step 1) into a reactor;
- and
- 3) fluorinating said mixture from step 1) comprising 1,1,1-trichloro-2,2,2-trifluoroethane, 1,1,1,2-tetrachloro-2,2-difluoroethane and 1,1-dichloro-1,2,2,2-tetrafluoroethane with hydrofluoric acid.
1 more element
A process for producing 1,1-dichloro-1,2,2,2-tetrafluoroethane, which comprises:
- 1) isomerizing and disportionation 1,1,2-trichloro-1,2,2-trifluoroethane in the presence of an activated catalyst comprising a halide or an oxide of at least one element selected from the group consisting of Al, Cr, Mg, Ca, Sr, Ba, Fe, Ni and Co to form 1,1,1-trichloro-2,2,2-trifluoroethane, 1,1,1,2-tetrachloro-2,2-difluoroethane and 1,1-dichloro-1,2,2,2-tetrafluoroethane;
- 2) introducing said mixture from step 1) into a reactor;
- and
- 3) fluorinating said mixture from step 1) comprising 1,1,1-trichloro-2,2,2-trifluoroethane, 1,1,1,2-tetrachloro-2,2-difluoroethane and 1,1-dichloro-1,2,2,2-tetrafluoroethane in the presence of an activated catalyst selected from the group consisting of an oxide and a halide, with hydrofluoric acid thereby yielding the desired product,
- wherein said oxide contains at least one element selected from the group consisting of Al, Cr, Mg, Ca, Sr, Ba, Fe, Ni, Co, Sb, Nb, Mn and Ta, and said halide contains at least one element selected from the group consisting of Cr, Mg, Ca, Sr, Ba, Fe, Ni, Co, Sb, Nb, Mn and Ta;
- wherein said oxide catalyst is activated with hydrogen fluoride or with a halogenated methane or halogenated ethane containing at least one fluorine atom, before it is used.
3 more elements
Dependencies are inferred from the claim text.