PROCESSO PARA A SEPARACAO DE 1,1,1,2-TETRAFLUORETANO (HFA 134A) DE UMA MISTURA RICA EM HFA 134A DO MESMO COM HF E/OU 1-CLORO-2,2-DIFLUORETILENO (CFC 11222)

摘要

A method for separating HFA 134a from an HFA 134a-rich mixture thereof with HF and/or CFC 1122 which comprises feeding the mixture to a distillation column to separate an azeotrope or near-azeotrope of HFA 134a and HF and/or CFC 1122 from a residue comprising substantially pure HFA 134a. Starting from an HF-rich mixture of HFA 134a such as a typical product stream in HFA 134a production, the method includes a first distillation step to separate HF from the initial mixture and produce an azeotrope or near azeotrope of HFA 134a and HF which is an HFA 134a-rich mixture.