Azeotropic mixture of 1,1-difluoroethane and hydrogen fluoride and production process of 1,1-difluoroethane
AssigneeDaiken Industries, Ltd.
InventorsTakehide Tsuda, Satoshi Komatsu
Life of this patent
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Abstract
There is provided an azeotropic mixture of hydrogen fluoride (HF) and 1,1-difluoroethane (HFC152a). In addition, there is provided a process for the production of HFC152a having a step of more effectively recovering HF which does not contain HFC152a or HFC152a which does not contain HF in which step an azeotropic mixture is distilled off from a column top by subjecting a mixture containing HFC152a and HF, so that HF which does not contain HFC152a or HFC152a which does not contain HF is recovered from a column bottom.
Claims6
An azeotropic mixture consisting essentially of 1,1-difluoroethane and hydrogen fluoride.
A process for recovering hydrogen fluoride which comprises distilling off an azeotropic mixture of 1,1-difluoroethane and hydrogen fluoride by subjecting a mixture comprising at least 1,1-difluoroethane and hydrogen fluoride to a distillation operation, and withdrawing a bottom product comprising hydrogen fluoride which product does not contain 1,1-difluoroethane.
A process for recovering 1,1-difluoroethane from an azeotropic mixture of 1,1-difluoroethane and hydrogen fluoride which comprises distilling off said azeotropic mixture of 1,1-difluoroethane and hydrogen fluoride by subjecting a mixture comprising at least 1,1-difluoroethane and hydrogen fluoride to a distillation operation, and withdrawing a bottom product comprising 1,1-difluoroethane which product does not contain hydrogen fluoride.
Dependencies are inferred from the claim text.