초록 ▼

Wet feed air to, or high purity nitrogen from, a pressure swing adsorption system is dried in a dryer membrane system preferably operated with a countercurrent flow path. Drying is enhanced by the use of a purge gas on the permeate side of the membrane, with waste gas from the pressure swing adsorpt

Wet feed air to, or high purity nitrogen from, a pressure swing adsorption system is dried in a dryer membrane system preferably operated with a countercurrent flow path. Drying is enhanced by the use of a purge gas on the permeate side of the membrane, with waste gas from the pressure swing adsorption system or a portion of the dry, high purity nitrogen product gas being used as purge gas.

대표청구항 ▼

An improved process for the production of dry, high purity nitrogen from air comprising: (a) passing a wet, high purity nitrogen from a pressure swing adsorption system or wet feed air stream to a dryer membrane system capable of selectively permeating water from said wet stream; (b) passing relativ

An improved process for the production of dry, high purity nitrogen from air comprising: (a) passing a wet, high purity nitrogen from a pressure swing adsorption system or wet feed air stream to a dryer membrane system capable of selectively permeating water from said wet stream; (b) passing relatively dry purge gas to the low pressure permeate side of said dryer membrane system to facilitate the carrying away of water vapor from the surface of the membrane and maintaining the driving force for removal of water vapor through the membrane from the high purity nitrogen or feed air stream for enhanced moisture removal therefrom, said relatively dry purge gas comprising waste gas from said pressure swing adsorption system or nitrogen product gas, whereby the provision of said purge gas on the permeate side of the dryer membrane system facilitates the desired moisture removal with minimum loss of product gas.