| 摘要 |
A process is provided for preparing 1,1,1,2-tetrafluoroethane. The process comprises fluorinating as a first step trichloroethylene in the gas phase with hydrogen fluoride in a first reaction to form 1,1,1-trifluoro-2-chloroethane, and then fluorinating as a second step the 1,1,1-trifluoro-2-chloroethane in the gas phase with hydrogen fluoride in a second reaction to generate a first gaseous mixture comprising 1,1,1,2-tetrafluoroethane. At least a part of the first gaseous mixture is fed to the first reaction where it acts as diluent. In addition, hydrogen chloride is recovered between the first and second fluorination steps. |
