Process for producing composite semipermeable membrane
A composite semi-permeable membrane and manufacturing method technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as membrane damage, decrease in membrane performance and salt rejection rate, and achieve the effect of preventing membrane damage
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[0068] Hereinafter, although an Example is given and demonstrated to this invention, this invention is not limited to these Examples.
[0069] 〔Evaluation and measurement method〕
[0070] (measured by flux and salt rejection)
[0071]Cut the obtained flat-film unwashed composite semi-permeable membrane and the cleaned composite semi-permeable membrane into specified shapes and sizes, and place them in a cell for flat membrane evaluation. At 25°C, a differential pressure of 1.5 MPa was applied to the supply side and the permeation side of the membrane, and an aqueous solution containing about 1500 mg / L of NaCl and adjusted to pH 6.5 to 7.5 with NaOH was brought into contact with the membrane. Measure the permeation velocity and conductivity of the permeated water obtained by this operation, and calculate the permeation flux (m 3 / m 2 • d) and salt rejection (%). As for the salt rejection rate, the correlation (calibration curve) between the NaCl concentration and the conduc...
manufacture example 1
[0076] (Production of porous support)
[0077] A film-forming coating material obtained by dissolving 18% by weight of polysulfone (manufactured by Solvay, P-3500) in N,N-dimethylformamide (DMF) was uniformly coated on a nonwoven fabric substrate, and The wet thickness was set at 200 μm. Thereafter, by immediately immersing it in water at 40 to 50°C to solidify it, and thoroughly extracting and washing DMF as a solvent, a wet porosity having a polysulfone microporous layer on a nonwoven fabric substrate is produced. support body. In addition, this wet porous support was dried at 120° C. for 5 minutes to produce a dry porous support.
Embodiment 1
[0079] An amine aqueous solution containing 3% by weight of m-phenylenediamine, 3% by weight of triethylamine and 6% by weight of camphorsulfonic acid was coated on the wet porous support to form an aqueous solution coating layer. Then, an isooctane solution containing 0.2% by weight of trimesic acid chloride was coated on the surface of the aqueous solution coating layer. Thereafter, it was kept in a hot air dryer at 120° C. for 3 minutes to form a skin layer containing a polyamide-based resin on the wet porous support to obtain an unwashed composite semipermeable membrane. Thereafter, pretreatment was carried out by immersing the unwashed composite semipermeable membrane in a 5% by weight aqueous methanol solution adjusted to 25° C. for 10 seconds, and then the pretreated unwashed composite semipermeable membrane was adjusted to 50° C. immersion in pure water for 10 minutes to perform membrane cleaning treatment to produce a composite semipermeable membrane. The passing tes...
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