Patent ID: 8721891

Claim:
A zeolite membrane, comprising: a layer that comprises at least two different types of zeolite crystals in mixed state, wherein the zeolite membrane has a separation coefficient of at least 500 as measured in pervaporation of a mixed solution containing 10 wt % of water and 90 wt % of isopropyl alcohol at a mixed solution temperature of 75° C. under atmospheric pressure after 45 minutes from start of measurement, at least two types of the at least two different types of zeolite crystals are detectable by an X-ray pattern obtained by X-ray diffraction, an output of an X-ray in the X-ray diffraction is 1.2 kW, the X-ray diffraction is with an X-ray bulb of copper, and a wavelength of the X-ray is 1.54058 Å.