| 摘要 |
The present invention relates to a method for separating a composition containing 2,3,3,3-tetrafluoropropene and hydrofluoric acid, and for recovering the thus-separated 2,3,3,3-tetrafluoropropene and hydrofluoric acid. The invention also relates to a method for manufacturing and purifying 2,3,3,3-tetrafluoropropene using a hydrofluorination reaction of the saturated or unsaturated compound having three carbon atoms and including at least one chlorine atom in the presence of a fluorination catalyst. |
| 主权项 |
1. A process for the manufacture of 2,3,3,3-tetrafluoropropene, comprising (i) at least one reaction stage during which at least one saturated or unsaturated hydrocarbon compound having three carbon atoms and comprising at least one chlorine atom reacts in the gas phase with HF in the presence of a fluorination catalyst to give a stream comprising 2,3,3,3-tetrafluoropropene and intermediates of 2,3,3,3-tetrafluoropropene, HCl and excess HF; (ii) a stage of removal of HCl from the stream exiting from stage (i); (iii) a stage of cooling said stream exiting from stage (ii) in the presence of an added amount of at least one compound (C1) selected from the group consisting of chlorocarbons, hydrochlorocarbons, hydrochlorofluorocarbons, alcohols, fluorinated alcohols, ethers, fluorinated ethers, ketones, esters, polyols and hydrofluorinated ethers in order to separate an upper phase rich in HF from a lower organic phase rich in 2,3,3,3-tetrafluoropropene and compound C1, whereby said separating occurs by settling; (iv) a stage of separation of the 2,3,3,3-tetrafluoropropene from the lower phase; and (v) a stage of purification of the 2,3,3,3-tetrafluoropropene. |
