Gas separation process.

摘要

A process for obtaining highly-purified gas by selectively separating gaseous impurities from gaseous mixture by the known pressure swing adsorption method uses a holding column of the feed-in/feed-out sequence retaining type and at least three adsorption columns containing adsorbents. Each adsorption column is pressurized and depressurized in cycle to repeat adsorption and desorption. During this, the holding column is used as an intermediate gas reservoir to improve the efficiency of the separation. In this invention, the capacity of the holding column is not sufficient to hold the whole amount of purge gas.