Home-made NaA zeolite membranes were used for pervaporation dehydration of ethylene glycol (EG)/water mixtures. Hydrothermal stability of the membranes in pervaporation was investigated for industrial application purpose. The membranes exhibited good stability for water content of less than 20 wt.% at 100 B.VC. The reduction of operating temperature was effective to improve membrane stability for operating at high feed water content (e.g. 30 wt.%). The influence of feed water content and operating temperature on dehydration of EG was extensively investigated. A permeation flux of 4.03 kg m(-2) h(-1) with separation factor of >5000 was achieved at 120 degrees C for the separation of the solution with 20 wt.% water content. A pilot-scale pervaporation facility with membrane area of 3m(2) was built up for dehydration of EG with the water content of 20 wt.%, which showed technical feasibility for industrial application. (C) 2011 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.