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METHOD FOR THE SELECTIVE SEPARATION OF AN ORGANIC ACID CONTAINING FLUORINE

Foreign code F190009674
File No. 4619
Posted date Jan 22, 2019
Country France
Application number 1650714
Gazette No. 3032129
Date of filing Jan 29, 2016
Gazette Date Aug 5, 2016
Priority data
  • P2015-017005 (Jan 30, 2015) JP
Title METHOD FOR THE SELECTIVE SEPARATION OF AN ORGANIC ACID CONTAINING FLUORINE
Abstract PROBLEM TO BE SOLVED: To provide a processing method where required energy and time are reduced and further a fluorine-containing organic acid having a carbon number of 2-7 can be selectively removed.SOLUTION: In a separation method of perfluorohexanoic acid in a fluorine-containing organic acid solution having a carbon number of 2-7 utilizing reverse osmosis using a semipermeable membrane, the semipermeable membrane has a fractionation molecular weight larger than the molecular weight of a fluorine-containing organic acid having a carbon number of 2-7 and a negative surface zeta potential.SELECTED DRAWING: Figure 1
(From JP2016144800 A)
Scope of claims [claim1]
1. Method for separating a fluorine containing at least one organic acid having carbon atoms in a 2-7 solution of the organic acid containing fluorine having 2-7 carbon atoms by filtration wherein: a filtration membrane has a molecular weight cutoff greater than the molecular weight of the organic acid containing fluorine having 2-7 carbon atoms and has a negative zeta potential surface.
[claim2]
2. Method according to claim 1 wherein the filtration is carried out by reverse osmosis.
[claim3]
3. Wherein the molecular weight of method according to claim 1 or 2 cutoff of the membrane filter is 5000 or more and 50000 DA Da or lower.
[claim4]
4. Wherein the molecular weight of method according to any one of claims 1 to 3 cutoff of the membrane filter is 8000 or more and 30000 DA Da or lower.
[claim5]
5. Wherein the molecular weight of method according to any one of claims 1 to 4 cutoff of the membrane filter is 15000 or more and 25000 DA Da or lower.
[claim6]
6. Wherein the zeta potential of the method according to any one of claims 1 to 5 surface of the membrane filter is less than or equal to-30 mV.
[claim7]
7. Wherein the zeta potential of the method according to any one of claims 1 to 6 surface of the membrane filter is less than or equal to-50 mV.
[claim8]
8. Wherein the zeta potential of the method according to any one of claims 1 to 7 surface of the membrane filter is-80 mV or less.
[claim9]
9. Wherein the molecular weight of method according to any one of claims 1 to 8 cutoff of the membrane filter is 5000 or more and 50000 DA Da or less and the zeta potential of the membrane filter surface is-30 or less MV.
[claim10]
10. Wherein the at least one organic acid method according to any one of claims 1 to 9 containing fluorine having 2-7 carbon atoms is a carboxylic acid containing fluorine having 2-7 carbon atoms or a salt thereof.
[claim11]
11. Method according to claim 10 wherein the carboxylic acid containing fluorine having 2-7 carbon atoms is a fluorine containing carboxylic acid of the formula (- I): X l - Rf l - COOH (- I) where: X l is H, F or Cl, and Rf L is a linear or branched fluoroalkylene group having 1-6 carbon atoms, a group having 1-6 carbon atoms which has a monoglycerolated œw fluoroalkylene group, or a group having 1-6 carbon atoms which has a poly-oxy fluoroalkylene; or perfluorocarboxylic acid of formula (i -a): X-2 2-Rf A=COOH (i -a) where: X ** 2 is H or F, and 2 RF is a group of formula (has): (CF2), - (CF20CF2) n r (CF20CF (CF3)), (has) in the formula (has), I is 0 or an integer from 1-4, m is 0 or an integer from 1-3, n is 0, 1 or 2, provided that I+2m+3n is not greater than 6, m and n are not simultaneously 0, and the order of occurrence of the respective repeating units in parentheses is not limited.
[claim12]
12. Method according to any one of claims 1 to 11 where the number of carbon atoms in the fluorine containing at least one organic acid having carbon atoms is 5-7 2-7.
[claim13]
13. Wherein the at least one organic acid method according to any one of claims 1 to 11 containing fluorine having 2-7 CF 3 0CF carbons is (see 3) see 2 0CF (see 3) COOH, CF3CF20CF2CF20CF2C001-1, 2 2 3 0CF 2 CF ═OCH FCF CF 2 CF CCOH, CF3CF20CF2CF20CF2C001-1, CF30CF2CF2CF2OCHFCF2COOH, 3 CF (see 2) 4 COOH, CF3CF2CF20CF (CF3) COOH, f. (see 2) 4 CH 2 CF 2 COOH, hr (CF2) 6COOH, - H (CF2) 4COOH, 2 0CF or 2=CFCF CH (CF3) COOH.
[claim14]
14. Filtration system equipped with a filtration membrane for a solution of an organic acid containing fluorine having 2-7 carbon atoms, wherein a semipermeable membrane has a molecular weight cutoff greater than the molecular weight of the organic acid containing fluorine having 2-7 carbon atoms and has a negative zeta potential surface.
  • Applicant
  • DAIKIN INDUSTRIES
  • KYOTO UNIVERSITY
  • Inventor
  • TOKUNO SATOSHI
  • KURAMITSU MASAKI
  • SHIBATA NORIAKI
  • TANAKA SHUHEI
  • HAYASHI MASUHIRO
  • ISHIKAWA KAZUMA
IPC(International Patent Classification)
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