Removal of (hydro)haloalkene impurities from product streams
AssigneeIneos Fluor Holdings Limited
InventorsStuart Corr, John Charles McCarthy
Life of this patent
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Abstract
A process for removing a (hydro)haloalkene impurity from a product stream containing that impurity and a desired compound is described. The process comprises contacting the product stream with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å. The process is particularly suited to the removal of (hydro)halopropene impurities from saturated hydrofluorocarbons such as a tetrafluoroethane, a pentafluoropropane, a hexafluoropropane or a heptafluoropropane.
Claims22
A process for removing at least one (hydro)haloalkene impurity) from a product stream containing that impurity and at least one desired compound, which process comprises contacting the product stream with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å.
A process for removing at least one (hydro)haloalkene impurity from a product stream containing that impurity and at least one hydrofluorocarbon, which process comprises contacting the product stream with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å.
A process as claimed in 3 or 4, wherein the at least one (hydro)halopropene comprises at least one compound selected from the group consisting of perfluoropropene, 1,1,3,3,3-pentafluoropropene and 2-chloro-1,1,3,3,3-pentafluoropropene.
A process as claimed in any one of the preceding claims, wherein the adsorbent comprises pores in which the openings to the pores have a size across their largest dimension in the range of from greater than 7 Å to less than 10 Å.
A process as claimed in any one of the preceding claims, wherein the adsorbent is a molecular sieve.
A process for removing at least one (hydro)halopropene impurity that comprises 2,3,3,3-tetrafluoropropene from a product stream containing that impurity and at least one desired compound, which process comprises contacting the product stream at a temperature of from −20 to 100° C. with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å.
A process for removing at least one (hydro)halopropene impurity that comprises 2,3,3,3-tetrafluoropropene from a product stream containing that impurity and at least one hydrofluorocarbon, which process comprises contacting the product stream with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å.
A process for removing at least one (hydro)halopropene impurity selected from the group consisting of perfluoropropene, 1,1,3,3,3-pentafluoropropene and 2-chloro-1,1,3,3,3-pentafluoropropene from a product stream containing that impurity and at least one desired compound, which process comprises contacting the product stream at a temperature of from −20 to 100° C. with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å.
A process for removing at least one (hydro)halopropene impurity selected from the group consisting of perfluoropropene, 1,1,3,3,3-pentafluoropropene and 2-chloro-1,1,3,3,3-pentafluoropropene from a product stream containing that impurity and at least one hydrofluorocarbon, which process comprises contacting the product stream with a solid adsorbent comprising pores having openings which have a size across their largest dimension in the range of from about 7 Å to about 10 Å.
Dependencies are inferred from the claim text.