| 摘要 |
PROBLEM TO BE SOLVED: To reduce a residual organic solvent and to obtain a module which does not cause the deterioration of not only membranes in the module but also of a main body by specifying the concentration of the organic solvent in a packing liquid or in water after being preserved with ultrapure water put in the module when no packing liquid is absent. SOLUTION: A module incorporated with separation membranes and others is used in various applications. As regards the membranes, the organic solvent solution of a polymer is adjusted and formed in the shapes of a membrane, a hollow fiber membrane, and others. Since the residual organic solvent of the module is minimized, the concentration of the organic solvent in a packing liquid or in water after being preserved at 80 deg.C for 24 hr with ultrapure water put in the module when the packing liquid is absent is set up at 50 ppb or below, preferably at 30 ppb or below. Only by a process in which the assembled module is irradiated with electron beams preferably in a ratio of 1-5 kGy, the organic solvent in the packing liquid can be decomposed.
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