Process for the removal of water from a solution by azeotropic distillation and process for the production of a hydrofluoroalkane
AssigneeSolvay (Societe Anonyme)
InventorsDominique Balthasart, Andre Jacquemart
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Abstract
The invention relates to binary azeotropic compositions between water and 1,1-dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane, 1,1,1-trifluoroethane, 1,1,1,2-tetrafluoroethane, 1,1-difluoroethane or trifluoroethylene, to a process for the removal of water from solutions by azeotropic distillation using these compositions, as well as to a process for the production of a hydrofluoroalkane in which water is removed from the mixture of reaction products by azeotropic distillation using these compositions.
Claims12
A process for removing water from a recovered mixture of reaction products in the production of a hydrofluoroalkane, comprising:
- forming a water and 1,1-dichloro-1-fluoroethane azeotrope in said mixture comprising hydrofluoroalkane and water, said azeotrope at 20.degree. C. having a water:
- 1,1-dichloro-1-fluoroethane molar ratio equal to (4.+-.0.4):100 and a vapor pressure of 0.67.+-.0.01 bar,
- distilling said mixture containing said azeotrope,
- removing said azeotrope containing water as an overhead product, and
- recovering said hydrofluoroalkane as a bottom product.
A process for removing water from a recovered mixture of reaction products in the production of a hydrofluoroalkane, comprising:
- forming a water and 1-chloro-1,1-difluoroethane azeotrope in said mixture comprising hydrofluoroalkane and water, said azeotrope at 20.degree. having a water:
- 1-chloro-1,1-difluoroethane molar ratio equal to (1.1.+-.0.1):
- 100 and a vapor pressure of 2.93.+-.0.01 bar,
- distilling said mixture containing said azeotrope,
- removing said azeotrope containing water as an overhead product, and
- recovering said hydrofluoroalkane as a bottom product.
A process for removing water from a recovered mixture of reaction products in the production of a hydrofluoroalkane, comprising:
- forming a water and 1,1,1-trifluoroethane azeotrope in said mixture comprising hydrofluoroalkane and water, said azeotrope at 20.degree. C. having a water:1,1,1-trifluoroethane molar ratio equal to (0.3.+-.0.03):100 and a vapor pressure of 11.+-.0.01 bar,
- distilling said mixture containing said azeotrope,
- removing said azeotrope containing water as an overhead product, and
- recovering said hydrofluoroalkane as a bottom product.
A process for removing water from a recovered mixture of reaction products in the production of a hydrofluoroalkane, comprising:
- adding 1,1-dichloro-1-fluoroethane to said mixture of reaction products to form a water and 1,1-dichloro-1-fluoroethane azeotrope in said mixture of reaction products, to said azeotrope at 20.degree. C. having a water:1,1-dichloro-1-fluoroethane molar ratio equal to (4.+-.0.4):100 and a vapor pressure of 0.67.+-.0.01 bar,
- distilling said mixture containing said azeotrope,
- removing said azeotrope containing water as an overhead product, and
- recovering said hydrofluoroalkane as a bottom product.
A process for removing water from a recovered mixture of reaction products in the production of a hydrofluoroalkane, comprising:
- adding 1-chloro-1,1-difluoroethane to said mixture of reaction products to form a water and 1-chloro-1,1-difluoroethane azeotrope in said mixture of reaction products, said azeotrope at 20.degree. having a water:1-chloro-1,1-difluoroethane molar ratio equal to (1.1.+-.0.1):100 and a vapor pressure of 2.93.+-.0.01 bar,
- distilling said mixture containing said azeotrope,
- removing said azeotrope containing water as an overhead product, and
- recovering said hydrofluoroalkane as a bottom product.
A process for removing water from a recovered mixture of reaction products in the production of a hydrofluoroalkane, comprising:
- adding 1,1,1-trifluoroethane to said mixture of reaction products to form a water and 1,1,1-trifluoroethane azeotrope in said mixture of reaction products, said azeotrope at 20.degree. C. having a water:1,1,1-trifluoroethane molar ratio equal to (0.3.+-.0.03):100 and a vapor pressure of 11.+-.0.01 bar,
- distilling said mixture containing said azeotrope,
- removing said azeotrope containing water as an overhead product, and
- recovering said hydrofluoroalkane as a bottom product.
Dependencies are inferred from the claim text.