An adsorption process in which high adsorption of C 2 -C 6 fluorine-containing compound can be attained without any morphological change thereof by the use of active carbon; and a desorption process in which active carbon and adsorbed substances can be recycled by desorption from active carbon. A liquid containing the C 2 -C 6 fluorine-containing compound is brought into contact with active carbon to thereby cause the active carbon to adsorb the fluorine-containing compound and thus obtain a liquid of low fluorine-containing compound content. The active carbon having the adsorbed fluorine-containing compound is heated so as to desorb the fluorine-containing compound from the active carbon.

Claims

15 · 4 independent · depth 2

15 granted claims

›1.independentA method of adsorbing a fluorine-containing compound, which comprises contacting a liquid containing the fluorine-containing compound with active carb…+7

›2.↳ 1The method of adsorption according to claim 1, wherein the active carbon is used, which has adsorption performance improved by subjecting the active c…d2

›3.↳ 1The method of adsorption according to claim 1, wherein the active carbon has an adsorption rate of the fluorine-containing compound of 10% or more.d2

›4.↳ 1The method of adsorption according to claim 1, wherein the adsorption rate of the fluorine-containing compound to the active carbon is controlled by c…d2

›11.↳ 1The method of adsorption according to claim 1, wherein the active carbon has a specific surface area of at most 2,500 m2/g.d2

›12.↳ 1The method of adsorption according to claim 1, wherein the surface of the active carbon is impregnated with a cation.d2

›13.↳ 1The method of adsorption according to claim 1, wherein the active carbon has a specific surface area of at least 1,500 m2/g.d2

›14.↳ 1The method of adsorption according to claim 1, wherein the steam activation treatment comprises exposing the active carbon to steam at a temperature o…d2

›5.independentA method of desorbing a fluorine-containing compound, which comprises desorbing the fluorine-containing compound from an active carbon by heating the …+2

›7.independentA method of treating a liquid containing a fluorine-containing compound, comprising contacting the liquid containing the fluorine-containing compound …

›8.independentA method of recovering a fluorine-containing compound, wherein the fluorine-containing compound, which was adsorbed by an active carbon, are desorbed …+2

Classifications

2 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C07C53/21

USPC · US Patent Classification

562/605

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5.3 y

1,938 days filing → grant

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non-final + final

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1 RCE

Examiner

Karl J Puttlitz

art unit 1621 · TC 1600

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20100197964 A1	5 Aug 2010

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