Abstract:

Polypropyrene（PP）hydrophobic hollow fiber membrane was used in ammonia/water separation，the effects of velocity，concentration，and temperature of both feed and absorbing liquids on the mass-transfer coefficient and ammonia removal ratio were examined. The results indicated that ammonia/water could be separated effectively with polypropyrene hydrophobic hollow fiber membrane. The circulation velocity and temperature of feed were the important factors. It was found that mass-transfer coefficient increased with feed temperature. However with increasing circulation feed velocity，membrane flux and pressure increased，and ammonia removal ratio decreased. It was also found that the starting ammonia concentration was important. With increasing starting ammonia concentration，membrane flux increased. With an excess of reactant concentration in the absorbing liquid over transfer ammonia concentration，the effect of concentration and velocity of absorbing liquid on the transfer process could be ignored.