Method for separating perfluoro(poly)ether-group-containing alcohol compounds

1. A method for chromatographically separating a mixture comprising a perfluoro(poly)ether group-containing monoalcohol compound represented by the following formula (2) and a perfluoro(poly)ether group-containing dialcohol compound represented by the following formula (3):

A-Pf-Z  (2)

Z-Pf-Z  (3)

wherein

Pf represents a divalent perfluoropolyether group,

A each independently represents an R 1 — group, an R 1 —O— group, an R 2 O—CH 2 —R 3 — group, or an R 2 O—CH 2 —R 3 —O— group,

R 1 each independently represents an alkyl group,

R 2 each independently represents an alkyl group,

R 3 each independently represents a divalent organic group containing 1 to 4 carbon atoms,

Z each independently represents an —R 5 —CH 2 OH group or an —O—R 5 —CH 2 OH group, and

R 5 each independently represents a bond or a divalent organic group containing 1 to 4 carbon atoms,

the method comprising:

adsorbing the mixture onto a stationary phase by using the same solvent as a solvent used as a mobile phase described below, and

eluting the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) by one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents to separate the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) from the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3).

2. The method according to claim 1 , further comprising increasing a temperature of the stationary phase to elute the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3) by one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrofluorocarbons, hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents after separating the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2).

3. A method for chromatographically separating a mixture comprising:

a perfluoro(poly)ether group-containing nonalcohol compound represented by the following formula (1),

a perfluoro(poly)ether group-containing monoalcohol compound represented by the following formula (2), and

a perfluoro(poly)ether group-containing dialcohol compound represented by the following formula (3):

A-Pf-A  (1)

A-Pf-Z  (2)

Z-Pf-Z  (3)

wherein

Pf represents a divalent perfluoropolyether group,

A each independently represents an R 1 — group, an R 1 —O— group, an R 2 O—CH 2 —R 3 — group, or an R 2 O—CH 2 —R 3 —O— group,

R 1 each independently represents an alkyl group,

R 2 each independently represents an alkyl group,

R 3 each independently represents a divalent organic group containing 1 to 4 carbon atoms,

Z each independently represents an —R 5 —CH 2 OH group or an —O—R 5 —CH 2 OH group, and

R 5 each independently represents a bond or a divalent organic group containing 1 to 4 carbon atoms,

the method comprising:

(i) adsorbing the mixture onto a stationary phase,

(ii) eluting the perfluoro(poly)ether group-containing nonalcohol compound represented by formula (1) by a mobile phase selected from nonpolar solvents and low-polarity solvents to separate the perfluoro(poly)ether group-containing nonalcohol compound represented by formula (1) from the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) and the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3),

(iii) eluting the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) by one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents to separate the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) from the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3), and

(iv) increasing a temperature of the stationary phase to elute the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3) by one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrofluorocarbons, hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents.

4. The method according to claim 2 , wherein a column temperature when eluting the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3) is 50 to 150° C.

5. The method according to claim 1 , wherein Pf is a perfluoro(poly)ether group represented by:

wherein a, b, c, and d are each independently an integer of 0 or 1 or more; the sum of a, b, c, and d is at least 1; and the occurrence order of the respective repeating units in parentheses with the subscript a, b, c or d is not limited in the formula.

6. The method according to claim 3 , wherein in formula (1) or (2), R 1 is each independently a C 1-16 perfluoroalkyl group, HCF 2 (CF 2 ) g —, or ClCF 2 (CF 2 ) g —, and g is an integer of 0 or more and 15 or less.

7. The method according to claim 5 , wherein b is an integer of 1 or more and 200 or less, and a, c, and d are 0.

8. The method according to claim 5 , wherein a and b are each independently an integer of 0 or more and 30 or less, and c and d are each independently an integer of 1 or more and 200 or less.

9. The method according to claim 3 , wherein Pf in formulae (1) to (3) has a number average molecular weight of 500 to 100,000.

10. The method according to claim 1 , wherein the mobile phase for eluting the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) is m-xylene hexafluoride, perfluorobenzene, perfluorohexyl methyl ether, perfluorobutyl ethyl ether, perfluorobutyl methyl ether, HCFC-225, or ethyl trifluoroacetate.

11. A method for producing a perfluoro(poly)ether group-containing monoalcohol compound represented by the following formula (2):

A-Pf-Z  (2)

wherein

Pf represents a divalent perfluoropolyether group,

A each independently represents an R 1 — group, an R 1 —O— group, an R 2 O—CH 2 —R 3 — group, or an R 2 O—CH 2 —R 3 —O— group,

R 1 each independently represents an alkyl group,

R 2 each independently represents an alkyl group,

R 3 each independently represents a divalent organic group containing 1 to 4 carbon atoms,

Z each independently represents an —R 5 —CH 2 OH group or an —O—R 5 —CH 2 OH group, and

R 5 each independently represents a bond or a divalent organic group containing 1 to 4 carbon atoms,

the method comprising:

adsorbing a mixture comprising the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) and a perfluoro(poly)ether group-containing dialcohol compound represented by the following formula (3):

Z-Pf-Z  (3)

wherein Pf, A, and Z are as defined above onto a stationary phase by using the same solvent as a solvent used as a mobile phase described below, and eluting the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) from the mixture, by using one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents in chromatography using a stationary phase to purify the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2).

12. A method for producing a perfluoro(poly)ether group-containing dialcohol compound represented by the following formula (3):

Z-Pf-Z  (3)

wherein

Pf represents a divalent perfluoropolyether group,

R 1 each independently represents an alkyl group,

R 2 each independently represents an alkyl group,

R 3 each independently represents a divalent organic group containing 1 to 4 carbon atoms,

Z each independently represents an —R 5 —CH 2 OH group or an —O—R 5 —CH 2 OH group, and

R 5 each independently represents a bond or a divalent organic group containing 1 to 4 carbon atoms,

the method comprising:

eluting a perfluoro(poly)ether group-containing monoalcohol compound represented by the following formula (2):

A-Pf-Z  (2)

wherein

Pf, and Z are as defined above, and

A each independently represents an R 1 — group, an R 1 —O— group, an R 2 O—CH 2 —R 3 — group, or an R 2 O—CH 2 —R 3 —O— group,

from a mixture comprising the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3) and the perfluoro(poly)ether group-containing monoalcohol compound represented by formula (2) by using one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents in chromatography using a stationary phase, and then increasing a column temperature to elute the perfluoro(poly)ether group-containing dialcohol compound represented by formula (3) by using one mobile phase of a single solvent in a liquid state selected from the group consisting of hydrofluorocarbons, hydrochlorofluorocarbons, hydrofluoroethers, fluorine-containing ester solvents, and fluorine-containing aromatic solvents.

13. The method according to claim 1 , wherein the stationary phase is selected from the group consisting of aluminum oxide, silica gel, magnesium oxide, aluminum silicate, magnesium silicate, chemically modified silica gel, and diatomaceous earth.

14. The method according to claim 1 , wherein the stationary phase is silica gel.