Composite semipermeable membrane and manufacturing method thereof
A composite semipermeable membrane and manufacturing method technology, applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as the reduction of desalination performance, achieve high permeation water volume, high inhibition of membrane pollutants adhesion. Effect
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[0139] Examples are given below to describe the present invention, but the present invention is not limited by these Examples.
[0140] (NaCl removal rate)
[0141] Evaluation water adjusted to a temperature of 25°C, a pH of 7, and a sodium chloride concentration of 2,000 ppm was supplied to the composite semipermeable membrane at an operating pressure of 1.55 MPa to perform membrane filtration treatment. The electrical conductivity of the supplied water and the permeated water were measured with a conductivity meter manufactured by Toa Denpa Kogyo Co., Ltd. to obtain their practical salinity, that is, the NaCl concentration. Based on the NaCl concentration thus obtained and the following formula, the NaCl removal rate was calculated.
[0142] NaCl removal rate (%)=100×{1-(NaCl concentration in permeate water / NaCl concentration in feed water)}
[0143] (through rate)
[0144] In the previous test, the membrane permeation volume of the supplied water (NaCl aqueous solution) ...
Embodiment 1
[0160] The composite semipermeable membrane obtained in Comparative Example 1 was brought into contact with an aqueous solution containing 100 ppm of polyacrylic acid (weight average molecular weight: 2,000, manufactured by Toagosei Co., Ltd.) and 0.1% of DMT-MM at 20° C. for 24 hours, and then washed with water. The obtained composite semipermeable membrane was evaluated, and the membrane performance is shown in Table 1.
Embodiment 2
[0162] The composite semipermeable membrane obtained in Comparative Example 1 was brought into contact with an aqueous solution containing 100 ppm of polyacrylic acid (5,000 in weight average molecular weight, manufactured by Wako Pure Chemical Industries, Ltd.) and 0.1% of DMT-MM at 20° C. for 24 hours, and then washed with water. The obtained composite semipermeable membrane was evaluated, and the membrane performance is shown in Table 1.
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