| 摘要 |
<p>PURPOSE: To increase a water vapor permeation flow rate by using an uncoated asymmetric membrane having a controlled pore diameter and to make the membrane usable for blowing away the water vapor from the permeation side by allowing the permeation of a part of fed gas. CONSTITUTION: The uncoated polysulfone hollow fibers spun from a soln. of a polysulfone polymer dissolved in a mixture composed of, for example, 1-formyl piperidine solvent and formamide non-solvent are used. Whether the porosity of the membrane is in an adequately controlled range or not is regulated by a sepn. coefft. of oxygen/nitrogen from air. This coefft. is so regulated as to be about 1.05 to about 2. Even more, the fed gas permeation selection rate to the water vapor is so regulated as to be at least about 1000%. The one flank of the membrane controlled in the porosity in such a manner and the fed gas contg. the water vapor are brought into contact with each other and a part of the fed gas is permeated together with the most part of water vapor through the other flank (permeation side) of the membrane. The permeated water vapor is blown away by the fed gas.</p> |
