Method for producing fluorinated organic compounds
View Patent ↗Disclosed are processes for the production of fluorinated olefins, preferably adapted to commercialization of CF 3 CF═CH 2 (1234yf). In certain preferred embodiments the processes comprise first exposing a compound of Formula (IA) C(X) 2 ═CClC(X) 3 (IA) where each X is independently F, Cl or H, preferably CCl 2 ═CClCH 2 Cl, to one or more sets of reaction conditions, but preferably a substantially single set of reaction conditions, effective to produce at least one chlorofluoropropane, preferably in accordance with Formula (IB): CF 3 CClX′C(X′) 3 Formula (IB) where each X′ is independently F, Cl or H, and then exposing the compound of Formula (IB) to one or more sets of reaction conditions, but preferably a substantially single set of reaction conditions, effective to produce a compound of Formula (II) CF 3 CF═CHZ (II) where Z is H, F, Cl, I or Br.
1. A process for making a tetrafluoropropene, comprising:
dehydrohalogenating 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) in the presence of a caustic agent.
2. The process of claim 1 wherein the tetrafluoropropene is 2,3,3,3-tetrafluoropropene.
3. The process of claim 1 wherein the caustic agent is at least one agent selected from the group consisting of KOH, NaOH, Ca(OH) 2 , and CaO.
4. The process of claim 3 wherein the caustic agent is KOH.
5. The process of claim 1 wherein the caustic agent is provided in a solution having a caustic agent strength of between about 2 wt % and about 100 wt. %.
6. The process of claim 1 wherein the caustic agent is provided in a solution having a caustic agent strength of between about 5 wt % and about 90 wt. %.
7. The process of claim 1 wherein the caustic agent is provided in a solution having a caustic agent strength of between about 10 wt % and about 80 wt. %.
8. The process of claim 1 wherein a mole ratio of the caustic agent:HCFC-244bb is from about 1:1 to about 2:1.
9. The process of claim 1 wherein a mole ratio of caustic agent:HCFC-244bb is from about 1.1:1 to about 1.5:1.
10. The process of claim 1 wherein a mole ratio of caustic agent:HCFC-244bb is from about 1.2:1 to about 1.4:1.
11. The process of claim 1 wherein the dehydrohalogenating step is conducted at a temperature from about 20° C. to about 100° C.
12. The process of claim 1 wherein the dehydrohalogenating step is conducted at a temperature from about 30° C. to about 90° C.
13. The process of claim 1 wherein the dehydrohalogenating step is conducted at a temperature from about 40° C. to about 80° C.
14. The process of claim 1 wherein a reaction pressure of the process ranges from atmospheric pressure, super-atmospheric pressure and sub-atmospheric pressure.
15. The process of claim 1 further comprising a phase transfer catalyst.
16. The process of claim 1 further comprising recovering the tetrafluoropropene.