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1. WO2020014130 - COMPOSITIONS ET PROCÉDÉS POUR UN PROCÉDÉ INTÉGRÉ DE PRÉPARATION DE 2,3,3,3-TÉTRAFLUOROPROPÈNE

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[ EN ]

CLAIMS

What is claimed is:

1. A method of synthesizing 3,3,3-thfluoropropene comprising:

contacting 1 ,3,3,3-tetrachloropropane, with a base at a temperature sufficient to effect dehydrochlorination to form 1 ,1 ,3- trichloro-1 -propene; and

contacting the 1 ,1 ,3-trichloro-1-propene, in the vapor phase, with hydrogen fluoride in the presence of a fluorination catalyst at a temperature sufficient to effect formation of 3,3,3-thfluoropropene.

2. The method of claim 1 , wherein the base includes sodium hydroxide, potassium hydroxide, or potassium tert-butoxide.

3. The method of claim 1 further comprising, recovering the 1 ,1 ,3- trichloro-1-propene from the reaction mixture prior to contacting the

1.1 .3-trichloro-1 -propene with hydrogen fluoride.

4. The method of claim 1 further comprising, recovering the 3,3,3- thfluoropropene from the reaction mixture.

5. The method of claim 1 , wherein the temperature sufficient to effect formation of 3,3,3-thfluoropropene is between 250°C and 350°C.

6. The method of claim 1 , wherein the fluorination catalyst includes activated carbon, alumina, chromium oxide, oxides of transition metals, or metal halides.

7. The method of claim 1 , wherein at least a 95 percent selectivity of

3.3.3-thfluoropropene is maintained in a continuous reaction for at least 30 hours.

8. A method of synthesizing 2,3,3,3-tetrafluoropropene comprising:

contacting 1 ,3,3,3-tetrachloropropane with a base at a temperature sufficient to effect dehydrochlorination to form 1 ,1 ,3- trichloro-1 -propene;

contacting the 1 , 1 ,3-trichloro-1 -propene, in the vapor phase, with hydrogen fluoride in the presence of a fluorination catalyst at a temperature sufficient to effect formation of 3,3,3-trifluoropropene; and

contacting the 3,3,3-trifluoropropene with one or more additional reagents sufficient to effect formation of 2,3,3,3-tetrafluoropropene.

9. The method of claim 8, wherein the step of contacting the 3,3,3- trifluoropropene with one or more additional reagents includes the steps of:

contacting the 3,3,3-trifluoropropene in the vapor phase with chlorine gas at a temperature to effect formation of 2,3-dichloro- 1 ,1 ,1-trifluoropropane;

contacting the 2,3-dichloro-1 , 1 ,1-trifluoropropane in the vapor phase with a base at a temperature sufficient to effect

dehydrochlorination to form 2-chloro-3,3,3-trifluoropropene;

contacting the 2-chloro-3,3,3-trifluoropropene in the vapor phase, with hydrogen fluoride in the presence of a fluorination catalyst at a temperature sufficient to effect formation of 2-chloro- 2,3,3,3-tetrafluoropropane; and

contacting the 2-chloro-2,3,3,3-tetrafluoropropane in the vapor phase with a base at a temperature sufficient to effect

dehydrochlorination to form 2,3,3,3-tetrafluoropropene.

10. The method of claim 8, wherein the fluorination catalyst is selected from the group consisting of activated carbon, alumina, chromium oxide, oxides of transition metals, or metal halides and combinations thereof.

1 1. A composition comprising 3,3,3-trifluoropropene formed by the

process of claim 1.

12. A composition comprising, 2,3,3,3-tetrafluoropropene formed by the process of claim 8.