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AssigneeCentral Glass Company, Limited
InventorsToru Nakazora, Toshihiro Nakamichi, Tuneyoshi Hisayuki, Katumi Takesita, Yutaka Katsuhara
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A method for removing a perfluoroalkyl alcohol from a waste gas and recovering the perfluoroalkyl alcohol comprising the steps of bringing the waste gas into contact with an aqueous alkaline solution thereby to absorb the perfluoroalkyl alcohol into said solution and consequently obtain an aqueous alkaline solution containing an alkoxide of the perfluoroalkyl alcohol. Adding an acid to the aqueous alkaline solution containing the alkoxide of the perfluoroalkyl alcohol until the alkaline solution turns into an acidic solution with a pH value smaller than 5, thereby to turn said alkoxide into said perfluoroalkyl alcohol and subjecting the acidic solution to distillation to recover the perfluoroalkyl alcohol.
A method for removing a fluoroalkyl alcohol from a waste gas, wherein said fluoroalkyl alcohol is selected from the group consisting of trifluoroethanol, pentafluoropropanol and hexafluoroisopropanol, the method comprising the step of bringing the waste gas into contact with an aqueous basic solution having a concentration in the range from 10 to 30% by weight of a base selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkaline earth metal hydroxides and alkaline earth metal carbonates, thereby to absorb the fluoroalkyl alcohol into said solution and consequently obtain an aqueous basic solution containing an alkoxide of the fluoroalkyl alcohol.
A method for removing a fluoroalkyl alcohol from a waste gas and recovering the fluoroalkyl alcohol, wherein said fluoroalkyl alcohol is selected from the group consisting of trifluoroethanol, pentafluoropropanol and hexafluoroisopropanol, the method comprising the steps of:
A method for removing a fluoroalkyl alcohol from a waste gas, wherein said fluoroalkyl alcohol is selected from the group consisting of trifluoroethanol, pentafluoropropanol and hexafluoroisopropanol, the method comprising the step of bringing the waste gas into contact with an aqueous basic solution having a concentration in the range from 10 to 30% by weight of ammonia, thereby to absorb the fluoroalkyl alcohol into said solution and consequently obtain an aqueous basic solution containing an alkoxide of the fluoroalkyl alcohol.
A method for removing a fluoroalkyl alcohol from a waste gas and recovering the fluoroalkyl alcohol, wherein said fluoroalkyl alcohol is selected from the group consisting of trifluoroethanol, pentafluoropropanol and hexafluoroisopropanol, the method comprising the steps of:
Dependencies are inferred from the claim text.