Azeotropic compositions of hydrogen fluoride and Z-3,3,3-trifluoro-1-chloropropene

Patent metadata

Field	Value
Publication number	US-10590052-B2
Application number	US-201816018191-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Dec 19, 2013
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A process for producing a main (hydro)halocarbon compound, including the formation of a mixture of compounds including hydrogen fluoride, Z-3,3,3-trifluoro-1-chloropropene and one or more other (hydro)halocarbon compounds, distillation of this mixture making it possible to collect, firstly, an azeotropic composition, and, secondly, at least one of the compounds of the mixture. The (hydro) halocarbon compounds are preferably selected among tetrachlorofluoropropanes, trichlorodifluoropropanes, dichlorotrifluoropropanes, chlorotetrafluoropropanes, pentafluoropropanes, dichlorodifluoropropenes, chlorotrifluoropropenes and tetrafluoropropenes.

First claim

The invention claimed is:

1. A process for producing a (hydro)halocarbon compound comprising from 1 to 3 carbon atoms, comprising:
forming a mixture of compounds comprising hydrogen fluoride, Z-3,3,3-trifluoro-1-chloropropene and two or more (hydro)halocarbon compounds comprising from 1 to 3 carbon atoms;
distilling the mixture to, firstly, an azeotropic composition comprising hydrogen fluoride, Z-3,3,3-trifluoro-1-chloropropene and two or more (hydro)halocarbon compounds comprising from 1 to 3 carbon atoms, and, secondly, at least one of the compounds of the mixture.

2. The process as claimed in claim 1 , comprising distilling the mixture to collect, firstly, the azeotropic composition, and, secondly, hydrogen fluoride.

3. The process as claimed in claim 1 , comprising distilling the mixture to collect, firstly, the azeotropic composition, and, secondly, E-3,3,3-trifluoro-1-chloropropene.

4. The process as claimed in claim 1 , wherein the at least one of the compounds of the mixture comprises 3,3,3-trifluoro-1-chloropropene.

5. The process as claimed in claim 1 , wherein the at least one of the compounds of the mixture comprises E-3,3,3-trifluoro-1-chloropropene.

6. The process as claimed in claim 1 , wherein the forming the mixture of compounds comprises a fluorination step, comprising the reaction of a chloro compound with hydrogen fluoride.

7. The process as claimed in claim 6 , comprising separating the azeotropic composition into two immiscible liquid fractions, namely a fraction rich in hydrogen fluoride and a fraction poor in hydrogen fluoride, the fraction rich in hydrogen fluoride containing a higher proportion of hydrogen fluoride than the fraction poor in hydrogen fluoride; and the fraction rich in hydrogen fluoride being, where appropriate, recycled into the fluorination step.

8. The process as claimed in claim 7 , comprising separating the azeotropic composition by decantation.

9. The process as claimed in claim 6 , wherein the chloro compound is 1,1,1,3,3-pentachloropropane or 1,1,3,3-tetrachloropropene.

10. The process as claimed in claim 1 , wherein the two or more (hydro)halocarbon compounds comprise three carbon atoms.

11. The process as claimed in claim 1 , wherein the two or more (hydro)halocarbon compounds is selected from the group consisting of tetrachlorofluoropropanes, trichlorodifluoropropanes, dichlorotrifluoropropanes, chlorotetrafluoropropanes, pentafluoropropanes, dichlorodifluoropropenes, trichlorofluoropropenes, chlorotrifluoropropenes and tetrafluoropropenes.

Assignees

• Arkema France

Inventors

• Deur-Bert Dominique
• Pigamo Anne
• Bonnet Philippe

Classifications

• C07C21/18

  containing fluorine · CPC title

• C07C17/383 Primary

  by distillation · CPC title

• C07B2200/09

  Geometrical isomers · CPC title

• B01D3/36

  Azeotropic distillation · CPC title

• C07C19/08

  containing fluorine · CPC title