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Method of separating anionic fluorochemical surfactant

A surfactant and separation method technology, applied in separation methods, organic anion exchangers, solid adsorbent liquid separation, etc., can solve the problems of a large amount of ammonia solution, a large amount of recovery or waste organic solvent, and a long elution time.

Inactive Publication Date: 2003-10-01
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two disadvantages in this method: 1) a large amount of ammonia solution is needed in the elution stage; 2) the elution time is too long
As a result, a large amount of cost is required to recover or discard the organic solvent from the aqueous solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Embodiment 1: Embodiment number 1-1~1-6

[0087] I) Adsorption

[0088] A glass column with an inner diameter of 2 cm and a length of 30 cm is filled with glass wool and 30 ml of weakly basic anion exchange resin DIAION WA-20, which is used as an adsorption tower. Next, 6 g of ammonium perfluorooctanoate was dissolved in 3 liters of water, and 2 ml of HCl (37%) was further added to prepare an acidic aqueous solution. The solution was adsorbed through the column at 20°C. The amount of adsorption on the ion exchange resin was determined by quantitative analysis of the content of ammonium perfluorooctanoate in the aqueous solution after passing through the column.

[0089] II) Elution

[0090] As an eluent, NaOH aqueous solution and organic solvent were mixed to prepare a 50ml solution. Table 1 shows the alkali concentration and organic solvent type of the eluent used in each example.

[0091]50 ml of each eluent was passed through the column at 20° C. for 10 minutes ...

Embodiment 2

[0094] On the IER column after implementing the embodiment number 1-4 of embodiment 1, use the hydrochloric acid aqueous acidic aqueous solution of perfluorooctanoic acid ammonium identical with embodiment 1, and flow through IER according to the method identical with embodiment 1, Adsorption of ammonium perfluorooctanoate. Then, use the same eluent as in Example No. 1-4 of Example 1, and flow through the IER column in the same way as in Example 1 to elute ammonium perfluorooctanoate. The results are shown in the second column of Table 2. Next, using the same IER column, the same adsorption and elution operations were repeated. The results are shown in the third column and the fourth column of Table 2.

[0095] times

[0096] As shown in Table 1, in Example Nos. 1 to 4 of Example 1 performed using an eluent having a small mixing ratio of the organic solvent, the recoveries were lower than those of other Example Nos. However, as shown in Table 2, when the ion excha...

Embodiment 3

[0098] According to the method disclosed in US Patent No. 3882153, using the solution shown in Table 3 as the eluent, ammonium perfluorooctanoate (Example 3-B) was separated in the same manner as in Example 1. Its result and the example result (Example 3-A) that the method of the present invention implements is shown in table 3. The results of Example 3-A correspond to the results of Example Nos. 1-3 of Example 1.

[0099] Example 3-A

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Abstract

In order to separate the fluorine-containing anion surfactant from an aqueous solution containing the fluorine-containing anion surfactant, by 1) contacting the aqueous solution with a basic anion exchange resin, the fluorine-containing anion surfactant is adsorbed on the basic anion exchange resin on; and then II) the basic anion exchange resin adsorbing the fluorine-containing anionic surfactant is eluted with an alkaline solution containing water and an organic solvent as an eluent.

Description

technical field [0001] The present invention relates to a method for separating fluorine-containing anion surfactants from aqueous solutions containing fluorine-containing anion surfactants, in particular to separating fluorine-containing anion surfactants used as emulsifiers in homopolymerization or copolymerization reactions of fluorine-containing monomers A method for recovering fluorine-containing anionic surfactants in an aqueous solution of active agents. Background technique [0002] In general, in tetrafluoroethylene (TFE), 1,1-difluoroethylene (VdF), fluorinated ethylene (VF), chlorotrifluoroethylene (CTFE), hexafluoropropylene (HEP) and fluorinated vinyl ether In the homopolymerization or copolymerization of fluorine-containing monomers such as (FVE) (these reactions can be collectively called "polymerization"), fluorine-containing anionic surfactants can be used as emulsifiers, such as C 7 f 15 COONH 4 , H(C 2 f 4 ) 3 COONa, H(C 2 f 4 ) 4 COONa. These fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/04B01J20/26B01J20/34B01J41/04B01J49/00C02F1/42C08F6/14C09K23/00
CPCB01J41/04C02F1/42C02F2001/422C08F6/14B01J41/05B01J41/07B01J49/57
Inventor 近藤昌宏市田卓也
Owner DAIKIN IND LTD