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US 2012/0074065 A1Published application
Zeolite membrane, separation membrane, and component separation method
AssigneeMitsubishi Chemical Corporation
InventorKiminori SATOU
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AssigneeMitsubishi Chemical Corporation
InventorKiminori SATOU
Estimating the term…
A zeolite membrane excellent in separation performance and having an acid resistance, and a separation membrane employing the zeolite membrane are provided. A zeolite membrane comprising a layer wherein at least two different types of zeolite crystals are present in mixed state, wherein at least two types of the above at least two different types of zeolite crystals are detectable by an X-ray pattern obtained by X-ray diffraction under the conditions that (A) the output of X-ray is 12 kW, (B) an X-ray bulb of copper (Cu) is employed, and (C) the wavelength of X-ray is 1.54058 Å. As an alternative, the zeolite membrane comprising a first layer containing zeolite crystals and a second layer containing different type of zeolite crystals from the zeolite crystals of the first layer, wherein the first layer and the second layer constitute a laminate structure, and the thickness of the laminate structure is at most 20 μm.
A zeolite membrane comprising a layer wherein at least two different types of zeolite crystals are present in mixed state,
A zeolite membrane comprising a first layer containing zeolite crystals and a second layer containing different type of zeolite crystals from the zeolite crystals of the first layer, wherein the first layer and the second layer constitute a laminate structure, and the thickness of the laminate structure is at most 20 μm.
A zeolite membrane wherein MOR and MFI are present in mixed state, which comprises the following layers (a) and (b) laminated in this order from a surface of the membrane towards the inside of the membrane:
A zeolite membrane wherein MOR and MFI are present in mixed state, which comprises the following layers (a) and (b′) laminated in this order from a surface of the membrane toward the inside of the membrane to form a laminate structure, wherein the thickness of the laminate structure is at most 20 μm:
A separation membrane which has a permeation flux Q (kg/m2·hr) and a separation coefficient α represented by the following formulae (1) and (2), respectively, as measured in pervaporation of a mixed solution containing 30 wt % of water and 70 wt % of acetic acid at a mixed solution temperature of 70° C. under atmospheric pressure after 45 minutes from start of measurement, wherein the reduction ratio of the permeation flux Q375 as measured after 375 minutes from start of the measurement based on the permeation flux Q as measured after 45 minutes from start of the measurement, is at most 20%:
Dependencies are inferred from the claim text.