Membrane Device for Water and Energy Exchange
A technology of heat exchange device and air conditioning device, applied in the direction of membrane, application, membrane technology, etc.
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Embodiment II
[0149] Example II. Thin Water Selective Molecular Sieve Membrane
[0150] Figure 7 shows a thin molecular sieve membrane 102, a NaA-type zeolite membrane 102 grown on a porous metal sheet support 116. The support sheet 116 has a thickness of about 50 μm. After the zeolite membrane 102 has grown, the membrane 102 has an average thickness of about 55 μm. The zeolite membrane layer 102 is so thin that the membrane 102 has the same mechanical rigidity and flexibility as the porous metal sheet 116 . It is rigid enough to hold one or both ends of the diaphragm and hold the diaphragm flat ( Figure 7A ). It is flexible enough to bend ( Figure 7B ). The membrane structure is shown by cross-sectional view ( Figure 7C ). On the porous metal support body 116, the dense zeolite membrane layer 102 with several micrometers thickness is grown. Can see the zeolite crystal ( Figure 7D ). The membrane surface contains intergrown zeolite crystals without any pores or cracks.
[0151]...
Embodiment III
[0152] Example III. H of Zeolite Membranes 2 O-molecular specificity
[0153] NaA type zeolite membrane 102 relative to the H of other molecules 2 Characterization of O selective permeation by gas separation tests using different feed gas mixtures. Permeability and selectivity were measured using the differential test cell described in Example I. Feed gas is introduced at atmospheric pressure into contact with the zeolite membrane surface while the permeate is drawn from the porous metal support by a vacuum pump at 1 to 10 mbar. Figure 9 shows the 85mol% CH 4 , 10mol% CO 2 , and 5mol% N 2 The composition of the humidified feed gas H 2 O permeability and selectivity. Since the mole fraction of water in the feed gas is constant ( Figure 9A ), H 2 O permeability increases slightly with temperature, while H 2 O to CO 2 , CH 4 and N 2 The selectivity decreases with temperature. h 2 O / CO 2 and H 2 O / CH 4 Selectivity ratio H 2 O / N 2 The selectivity is an order of...
Embodiment IV
[0156] Example IV. Humidity exchange through a thin zeolite membrane in a countercurrent test cell
[0157] A thin NaA / metal diaphragm 118 was cut into 40 mm x 110 mm samples and loaded into an integrating test cell made of stainless steel. Diaphragm 118 is supported by stainless steel beams 110 of 92.4 mm long x 0.3 mm wide x 1.5 mm high with a uniform spacing of 3.5 mm. The ratio of the area of the solid spacer 110 to the area of the diaphragm 118 is 0.068, ie the fractional open membrane area (OMA) is 0.932. The air flow void fraction (OFA) is 0.92, ie, the air flow cross-sectional area is 92% of the total cross-sectional area. The air flow channels 104, 106 consist of eleven 3.5 mm (width) x 1.5 mm (height) straight channels 104, 106. The hydraulic diameter is 2.1mm. A wet gas stream (Process Stream 1) is introduced into the test cell from one end of the membrane 118, contacts the zeolite membrane surface, and exits from the other end of the membrane 118. A purge d...
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