Extraction process
View Patent ↗A process for the separation of an alcohol from a non-polar solvent; a ketone from a non-polar solvent; an alcohol from a mixture of a ketone and a non-polar solvent; or a mixture of an alcohol and a ketone from a non-polar solvent; said process comprising contacting at least one ionic liquid with a mixture comprising a non-polar solvent and at least one of an alcohol and a ketone.
1. A process for the separation of
an alcohol from a non-polar solvent;
a ketone from a non-polar solvent;
an alcohol from a mixture of a ketone and a non-polar solvent; or
a mixture of an alcohol and a ketone from a non-polar solvent;
said process comprising contacting at least one ionic liquid with a mixture comprising a non-polar solvent and at least one of an alcohol and a ketone.
2. The process according to claim 1 wherein said alcohol is a cycloalkanol, said ketone is a cycloalkanone, and said non-polar solvent is a cycloalkane.
3. The process according to claim 2 for the separation of a cycloalkanone from a cycloalkane.
4. The process according to claim 2 for the separation of a cycloalkanol from a mixture of cycloalkanone and cycloalkane.
5. The process according to claim 2 for the separation of a mixture of a cycloalkanone and a cycloalkanol from a cycloalkane.
6. The process according to claim 2 for the separation of a cycloalkanol or a cycloalkanone or a mixture thereof from a cycloalkane or the separation of a cycloalkanol from a cycloalkanone and a cycloalkane, wherein on contacting said at least one ionic liquid with the mixture comprising at least one of a cycloalkanol and a cycloalkanone in a cycloalkane, two separate phases are formed wherein the first phase is ionic liquid-based and the second phase is cycloalkane-based.
7. The process according to claim 6 for the separation of a cycloalkanol from a cycloalkanone and a cycloalkane, wherein the two separate phases are allowed to reach equilibrium and wherein at equilibrium the distribution coefficient of the cycloalkanol between the ionic liquid-based phase and the cycloalkane-based phase is greater than 1.5.
8. The process according to claim 7 for the separation of a cycloalkanol from a cycloalkanone and a cycloalkane, wherein said distribution coefficient is greater than 3.
9. The process according to claim 6 for the separation of a cycloalkanol from a cycloalkanone and a cycloalkane, wherein the two separate phases are allowed to reach equilibrium and wherein at equilibrium the distribution coefficient for the cycloalkanol between the ionic liquid-based phase and the cycloalkane-based phase is greater than 1, and the distribution coefficient for the cycloalkanone between the ionic liquid-based phase and the cycloalkane-based phase is less than 1.
10. The process according to claim 6 for the separation of a cycloalkanol from a cycloalkane, wherein the two separate phases are allowed to reach equilibrium and wherein at equilibrium the distribution coefficient of the cycloalkanol between the ionic liquid-based phase and the cycloalkane-based phase is greater than 1.5.
11. The process according to claim 10 for the separation of a cycloalkanol from a cycloalkane, wherein said distribution coefficient is greater than 3.
12. The process according to claim 6 for the separation of a cycloalkanone from a cycloalkane, wherein the two separate phases are allowed to reach equilibrium and wherein at equilibrium the distribution coefficient of the cycloalkanone between the ionic liquid-based phase and the cycloalkane-based phase is greater than 1.5.
13. The process according to claim 12 for the separation of a cycloalkanone from a cycloalkane, wherein said distribution coefficient is greater than 3.
14. The process according to claim 6 for the separation of a mixture of a cycloalkanone and a cycloalkanol from a cycloalkane, wherein the two phase system is allowed to reach equilibrium and wherein at equilibrium the distribution coefficient of the cycloalkanone between the ionic liquid-based phase and the cycloalkane-based phase is greater than 1.5.
15. The process according to claim 14 for the separation of a cycloalkanone and a cycloalkanol from a cycloalkane, wherein said distribution coefficient is greater than 3.
16. The process according to any one of claims 1 to 15 , wherein each of said cycloalkanol, cycloalkanone and said cycloalkane contain 3-20 carbon atoms.
17. The process according to any one of claims 1 to 15 , wherein the cycloalkanol is cyclohexanol, the cycloalkanone is cyclohexanone and the cycloalkane is cyclohexane.
18. The process according to any one of claims 1 to 15 , wherein the cycloalkanol is cyclododecanol, the cycloalkanone is cyclododecanone and the cycloalkane is cyclododecane.
19. The process according to any one of claims 1 to 15 , further comprising, prior to said contacting step, the step of oxidation of a cycloalkane followed by a cyclohexyl hydroperoxide decomposition step followed by said contacting step defining one oxidation and separation cycle.
20. The process according to claim 19 , comprising a plurality of oxidation and separation cycles, wherein the cycloalkane-based phase or fraction which results from said separation is recycled for oxidation.
21. The process according to claim 20 , wherein subsequent to equilibrium being reached, the at least one ionic liquid-based phase is physically separated from the cycloalkane-based phase, and the cycloalkanol and/or cycloalkanone is removed from said at least one ionic liquid and said at least one ionic liquid is recycled.
22. The process according to any one of claims 1 to 15 , wherein said at least one ionic liquid consists of a mixture of two or more ionic liquids.
23. The process according to any one of claims 1 to 15 , wherein the cation of said at least one ionic liquid is selected from one or more of: 1-alkylpyridinium, alkyl- or poly-alkylpyridinium, phosphonium, alkyl- or polyalkylphosphonium, imidazolium, alkyl- or polyalkylimidazolium, ammonium, alkyl- or polyalkylammonium, alkyl- or polyalkylpyrazolium, alky- or polyalkylpyrrolidinium, alkyl- or polyalkylazepinium, alkyloxonium or alkysulfonium.
24. The process according to any one of claims 1 to 15 , wherein the anion of said at least one ionic liquid is selected from one or more of a halide, a nitrate, an alkylsulfate or alkyl polyalkoxysulfate, anions based on nitrogen, phosphorous, boron, silicon, selenium, tellurium, halogens, and oxoanions of metals.
25. The process according to any one of claims 1 to 15 , wherein at least one ionic liquid of said at least one ionic liquid comprises at least one C 2 -C 6 alkyl group, wherein the alkyl group may be present on the anion or the cation of said at least one ionic liquid.
26. The process according to any one of claims 1 to 15 , wherein said at least one ionic liquid is:
N-ethylpyridinium bis(trifluoromethanesulfonyl)amide;
N-Methyl-N′-butylimidazolium tetrafluoroborate;
N-Methyl-N′-butylimidazolium bis(trifluoromethanesulfonyl)amide;
trimethyl-(2-hydroxyethyl)ammonium bis(trifluoromethanesulfonyl)amide;
N-Methyl-N′-ethylimidazolium 2-methoxyethylsulfonate;
N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide;
N-Methyl-N′-butylimidazolium 2-methoxyethylsulfonate;
N-Methyl-N′-butylimidazolium bromide;
N-Methyl-N′-ethylimidazolium 2-ethoxyethylsulfonate;
N-Methyl-N′-butylimidazolium 1-(1-methoxypropoxy)-propylsulfonate;
N-Methyl-N′-butylimidazolium 1-(1-methoxyethoxy)-ethylsulfonate;
N-Methyl-N′-butylimidazolium 1-methyl(diethoxy)ethylsulfonate; or
N-Methyl-N-(butyl-4-sulfonic acid)pyrrolidinium trifluoromethanesulfonate, or mixtures thereof.
27. The process according to claim 26 , wherein said at least one ionic liquid is N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide.
28. The process according to claim 26 , wherein said at least one ionic liquid is N-Methyl-N′-butylimidazolium 1-(1-methoxypropoxy)-propylsulfonate.
29. A method for the use of at least one ionic liquid for the separation of an alcohol and/or ketone from a non-polar solvent, or for the separation of an alcohol from a ketone in a mixture of these compounds in a non-polar solvent by contacting at least one ionic liquid with a mixture comprising a non-polar solvent and at least one of an alcohol and a ketone.
30. The method according to claim 29 wherein said alcohol is a cycloalkanol and said ketone is a cycloalkanone.
31. The method according to claim 29 wherein said alcohol is a cycloalkanol and said ketone is a cycloalkanone and said non-polar solvent is a cycloalkane.