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Method for the selective separation of an organic acid containing fluorine UPDATE_EN

Foreign code F190009674
File No. 4619
Posted date Jan 22, 2019
Country France
Application number 1650714
Gazette No. 3032129
Gazette No. 3032129
Date of filing Jan 29, 2016
Gazette Date Aug 5, 2016
Gazette Date Apr 3, 2020
Priority data
  • P2015-017005 (Jan 30, 2015) JP
Title Method for the selective separation of an organic acid containing fluorine UPDATE_EN
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 organic acid containing fluorine having w7 carbon atony in a solution of the organic acid containing fluorine having-7 carbon atoms per filtering wherein: e of filtration membrane has a molecular rasse cutoff greater than the molecular weight of the organic acid containing fluorine having-7 carbon atoms and has a zeta potential €egatlf and r is the surface of the organic acid solution containing fluorine having-7 carbon atoms Content a metal salt.

[claim2]
2. Method according to claim 1 wherein the filtration is carried out by reverse osmosis.

[claim3]
3. Wherein the method according to claim 1 or 2, disconnecting the molecular amassed rnembr filtration does 5000 Da or greater and is 50000 Da or lower.

[claim4]
4. Wherein the trap method according to any one of claims 1 to 3 molecular switching off of the filter membrane 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. Method according to any of claims 1-5 wherein the zeta potential of the surface of the filtration membrane is-30 TV.MV least.

[claim7]
7. Method according to any of claims 1-6 wherein the zeta potential of the surface of the filtration membrane is-50 mV or less,

[claim8]
8. Method according to any one of claims 1 to 7 wherein the zeta potential of the 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 surface of the filtration membrane 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 (1) formula: X **1 - Rf1 A=COOH (- i) X i ' is H, F and 0, and Rf1 is a group fluoroaikylene linear or branched alkyl group having 1-6 carbon atoms, a group having 1-6 carbon atoms which has a mono-oxy fluoroalkylene, or a group having 1-6 carbon atoms which has a poly-oxy fluoroalkylene; or perfluorocarboxylic acid of the formula (- a): X **2 is H or F and Rf2 is a group of formula (has): in the formula (has), l is 0 or an integer from 1-4, n is 0 or an integer from-34. n is 0,1 or 2, provided that I+ m+ n 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 restricted.

[claim12]
12. Method according to any of claims 141 wherein the number of carbon atoms in the fluorine containing at least one organic acid having carbon atoms is 5-7 2-7.

[claim13]
13. Method according to any of claims 1-11 wherein the fluorine containing organic DDE is 2-7 having carbon atoms isCF30CF(CF3)CF20CF(CF3)COOH, CF3CF20CF2CF20CF2COOH, CF30CF2CF2CF2OCHFCF2COOH, CF3CF20CF2CF20CF2C001-1, CF30CF2CF2CF2OCHFCF2COOH, CF3(CF2)4COOH, CF3CF2CF20CF(CF3)COOH, F(CF2)4CH2CF2C001-1, H(CF2)6COOH, H(CF2)4COOH, ou CH2=CFCF20CF(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, and 1a at least one organic acid solution containing fluorine having 2-7 carbon atoms contains a metal salt.
  • 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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