Method for purifying material to be treated and method for producing coagulated material
A technology of processing objects and purification methods, which can be used in solid solvent extraction and other directions, and can solve problems such as easy fouling of membranes.
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Embodiment 1
[0140] Embodiment 1 removes the treatment of fluorosurfactant from fluorosurfactant aqueous solution
[0141] (1) The experimental device uses such as figure 1 The flow-through device shown in the schematic diagram. That is, the CO 2 After the carbon dioxide gas supplied by the high-pressure gas container 1 is cooled by the cooler 2, adjust the pressure and temperature to become a supercritical state, and stir the fluorine-containing surfactant aqueous solution (surfactant name: ammonium perfluorooctanoate [APFO] with a stirrer (stirring speed is 800rpm) ], initial surfactant concentration=550ppm), the supercritical carbon dioxide that 4000g obtains passes into above-mentioned aqueous solution with flow rate 12.2g / min. For the fluid containing supercritical carbon dioxide after passing through the fluorine-containing surfactant aqueous solution, the pressure is reduced to 0.1MPa and the density ρ is reduced to 2.0g / l through the pressure relief valve, and the fluorine-contai...
Embodiment 2
[0146] Example 2 Treatment to remove fluorosurfactant from aqueous dispersion
[0147] 51.3 g of an aqueous dispersion of fluoropolymer (TFE homopolymer) containing 147.0 ppm ammonium perfluorooctanoate as a fluorosurfactant (fluoropolymer concentration: 0.2% by mass) was used as the object to be treated instead of the fluorosurfactant The removal process was performed in the same manner as in Example 1 (1) except that the flow rate of supercritical carbon dioxide (662 g / l, 9 MPa, 35° C.) in the aqueous solution was 12.3 g / min. Its result is shown in table 1 together with the result of embodiment 1 (2). Figure 7 and Figure 8 . As can be seen from Table 1, the fluorine-containing surfactant in the aqueous dispersion is extracted by carbon dioxide in the same manner as in Example 1 (1), and when 1500 g of carbon dioxide is consumed, the concentration of the fluorine-containing surfactant is 0.6 ppm. In addition, by Figure 7 It can be seen that, compared with the removal t...
Embodiment 3
[0148] Example 3 Treatment to remove fluorosurfactant from fluoropolymer powder
[0149] Except having used 1.86g of fluorine-containing polymer powders containing a fluorine-containing surfactant [APFO] as a processing object, it carried out similarly to Example 2, and performed the removal process. The surfactant was extracted from the polymer with acetone, and after evaporating the acetone at 45°C, water was added, and the concentration of the fluorosurfactant in the fluoropolymer before and after the removal treatment was measured using HPLC. Its result is shown in table 1 and the result of embodiment 2 together with embodiment 1 (2), embodiment 2 Figure 8 . The result of the treatment to remove the fluorine-containing surfactant in the fluorine-containing polymer: when 1000 g of carbon dioxide was used, the initial 443.0 ppm of the fluorine-containing surfactant was reduced to 86.5 ppm.
[0150] [Table 1]
[0151]
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