One step process for manufacturing trifluoroiodomethane from trifluoroacetyl halide, hydrogen, and iodine
The present disclosure provides a process for producing trifluoroiodomethane (CF 3 I). The process includes providing vapor-phase reactants including trifluoroacetyl halide, hydrogen, and iodine, heating the vapor-phase reactants, and reacting the heated vapor-phase reactants in the presence of a catalyst to produce trifluoroiodomethane. The catalyst includes a transition metal.
1. A process for producing trifluoroiodomethane (CF3I), the process comprising:
providing vapor-phase reactants comprising trifluoroacetyl halide, hydrogen, and iodine;
heating the vapor-phase reactants; and
reacting the heated vapor-phase reactants in the presence of a catalyst to produce trifluoroiodomethane, the catalyst comprising a transition metal.
2. The process of claim 1 , wherein in the providing step, the trifluoroacetyl halide, the iodine, and the hydrogen each comprise less than about 500 ppm by weight of water.
3. The process of claim 1 , wherein in the providing step, a molar ratio of the hydrogen to the iodine is from about 0.1:1 to about 0.9:1.
4. The process of claim 1 , wherein in the providing step, a molar ratio of the hydrogen to the trifluoroacetyl halide is from about 0.01:1 to about 0.05:1.
5. The process of claim 1 , wherein the transition metal includes at least one selected from the group of nickel, cobalt, iron, rhodium, iridium, platinum, and palladium.
6. The process of claim 5 , wherein the catalyst further comprises a support including at least one selected from the group of an aluminum oxide support, a carbon support, a silica gel support, and a silicon carbide support.
7. The process of claim 6 , wherein the transition metal is from about 0.01 wt. % to about 40 wt. % of the total weight of the transition metal and the support.
8. The process of claim 7 , wherein the transition metal includes palladium, the support includes aluminum oxide, and the palladium is about 0.5 wt. % of the total weight of the palladium and the aluminum oxide.
9. The process of claim 7 , wherein the transition metal includes nickel, the support includes aluminum oxide, and the nickel is about 21 wt. % of the total weight of the nickel and the aluminum oxide.
10. The process of claim 1 , wherein the vapor-phase reactants are heated to a temperature from about 200° C. to about 600° C.
11. The process of claim 1 , wherein the trifluoroacetyl halide comprises trifluoroacetyl chloride.
12. The process of claim 1 , wherein the process further comprises the additional steps of:
separating unreacted iodine from the trifluoroiodomethane; and
returning the unreacted iodine to the providing step.
13. The process of claim 1 , wherein the process is a continuous process.
14. The process of claim 1 , wherein the process is a batch process.
15. A process for producing trifluoroiodomethane (CF3I), the process comprising the following steps:
reacting a trifluoroacetyl halide, hydrogen, and iodine in the vapor phase a temperature from about 200° C. to about 600° C. in the presence of a catalyst to produce a product stream comprising the trifluoroiodomethane, unreacted trifluoroacetyl halide, unreacted hydrogen, unreacted iodine, and hydrogen iodide, the catalyst comprising a transition metal;
removing at least some of the unreacted iodine from the product stream by cooling the product stream to condense iodine from the vapor phase; and
recycling the condensed iodine to the reacting step.
16. The process of claim 15 , wherein a molar ratio of the hydrogen to the iodine is from about 0.1:1 to about 0.9:1.
17. The process of claim 15 , wherein the transition metal includes at least one selected from the group of nickel, cobalt, iron, rhodium, iridium, platinum, and palladium.
18. The process of claim 17 , wherein the catalyst further comprises a support including at least one selected from the group of an aluminum oxide support and a carbon support, and the transition metal is from about 0.01 wt. % to about 40 wt. % of the total weight of the transition metal and the support.
19. The process of claim 15 , wherein a molar ratio of the hydrogen to the trifluoroacetyl halide is from about 0.01:1 to about 0.05:1.
20. The process of claim 15 , wherein the process further comprises the additional steps of:
separating the unreacted trifluoroacetyl halide from the product stream; and
recycling the separated trifluoroacetyl halide to the reacting step.