Method for purifying hydrofluorocarbons

Patent metadata

Field	Value
Publication number	US-11918939-B2
Application number	US-202017639357-A
Country	US
Kind code	B2
Filing date	Sep 4, 2020
Priority date	Sep 6, 2019
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

The present invention relates to a process for purifying a composition comprising a hydrohalocarbon B comprising the steps of: i) providing a composition A1 comprising a hydrohalocarbon B and at least one impurity C different from said hydrohalocarbon B, ii) compressing said composition A1, and optionally cooling it, so as to obtain said hydrohalocarbon B in liquid form in order to form a liquid stream A2 comprising said hydrohalocarbon B, iii) distilling said stream A2 obtained in step ii) in order to form and recover a stream A3 comprising said hydrohalocarbon B, characterized in that step iii) is carried out in a pressurized distillation device comprising one or more rotating packed beds.

First claim

The invention claimed is:

1. A process for purifying a composition comprising a hydrohalocarbon B comprising the steps of:
i. providing a composition A1 comprising a hydrohalocarbon B and at least one impurity C different from said hydrohalocarbon B,
ii. compressing said composition A1, and optionally cooling it, so as to obtain said hydrohalocarbon B in liquid form in order to form a liquid stream A2 comprising said hydrohalocarbon B,
iii. distilling said stream A2 obtained in step ii) in order to form and recover a stream A3 comprising said hydrohalocarbon B and a stream A4 comprising said at least one impurity C wherein step iii) is carried out in a pressurized distillation device comprising one or more rotating packed beds.

2. The process as claimed in claim 1 , wherein said stream A2 is introduced in liquid form into said one or more rotating packed beds and is distributed therein radially with respect to a rotatable shaft thereof.

3. The process as claimed in claim 1 , wherein the speed of said one or more rotating packed beds is from 100 to 3000 revolutions per minute (rpm).

4. The process as claimed in claim 1 , wherein step iii) is carried out at a pressure of from 2 to 200 bar absolute.

5. The process as claimed in claim 1 , wherein said hydrohalocarbon B comprises three carbon atoms and at least one halogen atom.

6. The process as claimed in claim 1 , wherein said hydrohalocarbon B is of formula (I) CX(Y) 2 —CX(Y) m —CH m XY, where X and Y independently represent H, F or Cl and m=0 or 1 with at least one from among X or Y being Cl or F.

7. The process as claimed in claim 1 , wherein said hydrohalocarbon B is selected from the group B1 consisting of 2,3,3,3-tetrafluoropropene, 2-chloro-3,3,3-trifluoropropene, 1,3,3,3-tetrafluoropropene, 1-chloro-3,3,3-trifluoropropene, 1,1,1,2,2-pentafluoropropane, 2-chloro-1,1,1,2-tetrafluoropropane, 2,3-dichloro-1,1,1-trifluoropropane, 3,3,3-trifluoropropene, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,3-pentafluoropropane, 1,1,1,2,3-pentafluoropropene, 1,1,1,2,3-pentachloropropane, 1,1,2,2,3-pentachloropropane, 1,1,1,3,3-pentachloropropane, 1,1,2,3-tetrachloro-1-propene, 2,3,3,3-tetrachloro-1-propene, 1,1,3,3-tetrachloro-1-propene and 1,3,3,3-tetrachloro-1-propene.

8. The process as claimed in claim 1 , wherein said at least one impurity C is selected from the group Cl consisting of chloromethane, dichloromethane, tetrachloromethane, trichlorofluoromethane, dichlorodifluoromethane, trichlorotrifluoroethane, dichlorotetrafluoroethane, chloropentafluoroethane, fluoromethane, difluoromethane, trifluoromethane, fluoroethane, 1,1-difluoroethane, 1,2-difluoroethane, 1,1,1-trifluoroethane, 1,1,2-trifluoroethane, 3,3,3-trifluoropropyne, methane, ethane, propane, 1,1,1-trifluoroethane, 1,1,1,2,3,3,3-heptachloropropane, 1,1,1,2,2,3,3-heptachloropropane, 2-chloro-1,1,1,3,3,3-hexafluoropropane, 1-chloro-1,1,2,3,3,3-hexafluoropropane, 2-chloro-1,1,2,3,3,3-hexafluoropropane, 3-chloro-1,1,1,2,2,3-hexafluoropropane, 1-chloro-1,1,2,2,3,3-hexafluoropropane, 1,1,1,3,3,3-hexachloropropane, 1,1,1,2,3,3-hexachloropropane, 1,1,2,2,3,3-hexachloropropane, 1,1,1,2,2,3-hexachloropropane, 3-chloro-1,1,1,3,3-pentafluoropropane, 1-chloro-1,2,3,3,3-pentafluoropropane, 1-chloro-1,1,2,3,3-pentafluoropropane, 3-chloro-1,1,2,2,3-pentafluoropropane, 3-chloro-1,1,1,2,2-pentafluoropropane, 1-chloro-1,1,2,2,3-pentafluoropropane, 2-chloro-1,1,1,3,3-pentafluoropropane, 2-chloro-1,1,2,3,3-pentafluoropropane, 2-chloro-1,1,1,2,3-pentafluoropropane, 1,1,1,3,3,3-hexafluoropropane, 1,1,2,2,3,3-hexafluoropropane, 1,1,1,2,2,3-hexafluoropropane, 1,1,1,2,3,3-hexafluoropropane, 1,1,1,3,3-pentachloropropane, 1,1,2,3,3-pentachloropropane, 1,1,1,2,3-pentachloropropane, 1,1,2,2,3-pentachloropropane, 1,1,1,2,2-pentachloropropane, 1,1,2,2,3-pentafluoropropane, 1,1,1,2,2-pentafluoropropane, 1,1,2,3,3-pentafluoropropane, 1,1,1,2,3-pentafluoropropane, 1,1,1,3,3-pentafluoropropane, 1,1,3,3-tetrachloropropane, 1,1,1,3-tetrachloropropane, 1,1,2,3-tetrachloropropane, 1,1,1,2-tetrachloropropane, 1,2,2,3-tetrachloropropane, 1,1,2,2-tetrachloropropane, 1-chloro-1,1,3-trifluoropropane, 1-chloro-3,3,3-trifluoropropane, 1-chloro-1,1,3-trifluoropropane, 2-chloro-1,2,3-trifluoropropane, 2-chloro-1,1,2-trifluoropropane, 1-chloro-2,2,3-trifluoropropane, 1-chloro-1,2,2-trifluoropropane, 3-chloro-1,1,2-trifluoropropane, 1-chloro-1,2,3-trifluoropropane, 1-chloro-1,1,2-trifluoropropane, 1,1,3-trichloropropane, 1,1,1-trichloropropane, 1,2,3-trichloropropane, 1,1,2-trichloropropane, 1,2,2-trichloropropane, hexachloropropene, 1,1,2-trichloro-3,3,3-trifluoropropene, 1,2,3-trichloro-1,3,3-trifluoropropene, 2,3,3-trichloro-1,1,3-trifluoropropene, 3,3,3-trichloro-1,1,2-trifluoropropene, 1,3,3-trichloro-1,2,3-trifluoropropene, 1,1,3-trichloro-2,3,3-trifluoropropene, 3,3-dichloro-1,1,2,3-tetrafluoropropene, 2,3-dichloro-1,1,3,3-tetrafluoropropene, 1,3-dichloro-1,2,3,3-tetrafluoropropene, 1,2-dichloro-1,3,3,3-tetrafluoropropene, 1,2-dichloro-2,3,3,3-tetrafluoropropene, hexafluoropropene, 1,1,2,3,3-pentachloropropene, 1,2,3,3,3-pentachloropropene, 1,1,3,3,3-pentachloropropene, 1,2-dichloro-3,3,3-trifluoropropene, 2,3-dichloro-1,3,3-trifluoropropene, 2,3-dichloro-1,1,3-trifluoropropene, 3,3-dichloro-1,1,3-trifluoropropene, 1,3-dichloro-1,3,3-trifluoropropene, 1,1-dichloro-3,3,3-trifluoropropene, 1,1-dichloro-2,3,3-trifluoropropene, 1,3-dichloro-2,3,3-trifluoropropene, 3,3-dichloro-1,2,3-trifluoropropene, 3,3-dichloro-1,1,2-trifluoropropene, 3-chloro-1,1,2,3-tetrafluoropropene, 2-chloro-1,1,3,3-tetrafluoropropene, 3-chloro-1,1,3,3-tetrafluoropropene, 1-chloro-1,2,3,3-tetrafluoropropene, 1-chloro-1,3,3,3-tetrafluoropropene, 3-chloro-1,2,3,3-tetrafluoropropene, 2-chloro-1,3,3,3-tetrafluoropropene, 1-chloro-2,3,3,3-tetrafluoropropene, 1,1,3,3,3-pentafluoropropene, 1,1,2,3,3-pentafluoropropene, 1,2,3,3,3-pentafluoropropene, 1,1,2,3-tetrachloroprop ene, 1,2,3,3-tetrachloropropene, 2,3,3,3-tetrachloropropene, 1,1,3,3-tetrachloroprop ene, 1,3,3,3-tetrachloropropene, 2-chloro-3,3,3-trifluoropropene, 3-chloro-2,3,3-trifluoropropene, 1-chloro-2,3,3-trifluoropropene, 1-chloro-3,3,3-trifluoropropene, 2-chloro-1,3,3-trifluoropropene, 3-chloro-1,2,3-trifluoropropene, 3-chloro-1,3,3-trifluoropropene, 3-chloro-1,1,2-trifluoropropene, 2-chloro-1,1,3-trifluoropropene, 3-chloro-1,1,3-trifluoropropene, 1-chloro-1,2,3-trifluoropropene, 1-chloro-1,3,3-trifluoropropene, 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,2,3-tetrafluoropropene, 1,1,3,3-tetrafluoropropene, 1,2,3,3-tetrafluoropropene, 1,1,2-trichloropropene, 1,2,3-trichloropropene, 2,3,3-trichloropropene, 1,1,3-trichloropropene, 1,3,3-trichloropropene, 3,3,3-trichloropropene, 3-chloro-3,3-difluoropropene, 3-chloro-2,3-difluoropropene, 2-chloro-3,3-difluoropropene, 2-chloro-1,1-difluoropropene, 3-chloro-1,1-difluoropropene, 3-chloro-1,2-difluoropropene, 2-chloro-1,3-difluoropropene, 3-chloro-1,3-difluoropropene, 1-chloro-2,3-difluoropropene, 1-chloro-3,3-difluoropropene, 1,1,3-trifluoropropene, 1,1,2-trifluoropropene, 3,3,3-trifluoropropene, 1,2,3-trifluoropropene, 2,3,3-trifluoropropene, 1,3,3-trifluoropropene, 1,1-dichloropropene, 1,2-dichloropropene, 2,3-dichloropropene, 1,3-dichloropropene, 3,3-dichloropropene, 1,1-difluoropropene, 1,2-difluoropropene, 2,3-difluoropropene and 3,3-difluoropropene.

9. The process as claimed in claim 1 , wherein said stream A3 comprises said hydrohalocarbon B in a weight content of greater than 90% by weight on the basis of the total weight of said stream A3.

10. The process as claimed in claim 1 , wherein in said stream A3 the content of said at least one impurity C is less than 1% by weight.

11. The process as claimed in claim 1 , wherein said pressurized distillation device comprises a

Assignees

• Arkema France

Inventors

• Dubois Jean-Luc

Classifications

• B01D3/08 Primary

  in rotating vessels; Atomisation on rotating discs ({B01D1/222} , B01D3/10 take precedence) · CPC title

• C07C17/383

  by distillation · CPC title