Nitto-denko Corporation

Osami Tozawa

Akio Iwama

Takeshi Sasaki

Akira Shimazu

This invention relates to a method of removing dissolved gas from liquid, which comprises bringing the liquid containing the gas dissolved therein into contact with a membrane, thereby causing the dissolved gas to selectively permeate the membrane. The membrane is a permselective, composite membrane composed of a porous support and a nonporous, active membrane of a synthetic resin formed on the porous support, or is a permeable membrane having such characteristics that the nitrogen gas permeation rate at 30.degree. C. is in the range from 7.times.10.sup.-4 to 2.times.10.sup.2 Nm.sup.3 m.sup.2 .multidot.h.multidot.atom and that the amount of permeated steam is 100 g/m.sup.2 .multidot.h or less when 20.degree. C. water is supplied to the membrane under atmospheric pressure while maintaining the pressure on its permeate side at 40 mmHg.

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Osaka, Japan

Osami Tozawa