Forward osmosis concentration method of ionic liquid water solution
An ionic liquid and aqueous solution technology, applied in reverse osmosis, chemical instruments and methods, semi-permeable membrane separation, etc., can solve the problem of limited concentration and achieve the effect of wide selection, universality and good recovery effect
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[0049] Example 1
[0050] Prepare 1L sodium chloride aqueous solution with a concentration of 6mol / L as the extraction solution, prepare 0.5L 1-butyl-3-methylimidazole chloride (M4) aqueous solution with a concentration of 0.5mol / L as the raw material solution, and transfer the two solutions To the corresponding raw material liquid storage tank. The separation membrane adopts the commercial reverse osmosis membrane FilmTec BW30-4040 (DOW), the pump adopts the peristaltic pump Masterflex L / S (Cole-Parmer), the cross-flow flow rate is set to 30L / h, the concentration time is 96h, and the draw liquid circulation and raw material liquid are controlled The cycle temperature is 30°C. The forward osmosis concentration performance is shown in Table 1.
Example
[0051] Examples 2~5
[0052] The 1-butyl-3-methylimidazole chloride in Example 1 was replaced with 1-hexyl-3-methylimidazole chloride (M6), 1-octyl-3-methylimidazole chloride (M8 ), 1-decyl-3-methylimidazole chloride (M10), 1-dodecyl-3-methylimidazole chloride (M12), pyridine chloride, and other conditions are the same as in Example 1. The forward osmosis concentration performance is shown in Table 1.
[0053] Table 1 Forward osmosis concentration performance of Examples 1 to 5
[0054]
Example
[0055] Examples 6-9
[0056] The 1-butyl-3-methylimidazole chloride in Example 1 was replaced with N-butylpyridine chloride (P4), Mhexylpyridine chloride (P6), and N-octylpyridine chloride (P8) respectively. , N-decylpyridine chloride (P10), N-dodecylpyridine chloride (P12), other conditions are the same as in Example 1. The forward osmosis concentration performance is shown in Table 2.
[0057] Table 2 Forward osmosis concentration performance of Examples 6-9
[0058]
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