Method of removing dissolved gas from liquid.

摘要

Liquid containing the gas dissolved therein is brought into contact with a membrane, thereby causing the dissolved gas to selectively permeate said membrane, said membrane being a permselective, composite membrane composed of a porous support and a nonporous, active membrane of a synthetic resin formed on said porous support, or being a permeable membrane having such characteristics that the nitrogen gas permeation rate at 30<o>C is in the range from 7 x 10<-><4> to 2 x 10<2> Nm<3>/m<2>.h.atom and that the amount of permeated steam is 100 g/m<2>.h or less when 20<o>C water is supplied to said membrane under atmospheric pressure while maintaining the pressure on its permeate side at 40 mmHg.