Abstract: In this paper, the water balance in para-xylene separation unit is discussed. The effect of water in adsorbent on the stability and selective adsorption performance of the adsorbent is analyzed, finally, measures for keeping the optimal water content of adsorbent are put forward, such as proper controlling the amount of water injection, monitoring the water content in feed and tracing water balance daily, to prolong the service life of adsorbent and ensure a safety running of the unit under optimum conditions.

Key words: para-xylene, adsorbent, water content, control