Membrane dehydration of isopropyl alcohol (IPA) is an attractive alternative to azeotropic distillation in terms of energy saving. First, the optimal conditions for synthetic of CHA zeolite membrane on porous alumina tubes was explored to shorten the enrichment time in a continuously recycled dehydration for IPA-water vapor mixture. Second, it was found that use of a membrane with higher water-selectivity raised the IPA recovery rate but required a longer enrichment time. It was also found that the water permeability of the membrane increased while the selectivity decreased with increasing temperature, and accordingly the operation temperature was increased in two steps, from 100 to 140 degrees C. As a result, concentration polarization was suppressed and the enrichment time was signiicantly reduced.