Advanced Thin Zeolite/Metal Flat Sheet Membrane for Energy Efficient Air Dehumidification and Conditioning
- Air conditioning consumes a large amount of electricity globally in warm humid climates.
- Efficient membrane dehumidification requires both high permeance and selectivity.
- Thin zeolite/metal sheet membranes are demonstrated for this application first time.
- H2O permeance of 6.8×10−6 mol/(m2 Pa s) and H2O/air separation factor of 300 are obtained.
Development of Thin Porous Metal Sheet as Micro-filtration Membrane and Inorganic Membrane Support
- Thin (25–200 µm) porous Ni alloy sheets of sub-micrometer pores are prepared with uniform pore structures.
- Inexpensive metal oxide powder is used as the metal precursor.
- The preparation process is versatile for tailoring of sheet chemical and physical properties.
- The 50 µm-thick sheet shows gas permeance of 1.0 × 10−4 mol/(m2 Pa s) and water permeability of 10,000 L/m2/h/bar.
Preparation of Robust, Thin Zeolite Membrane Sheet for Molecular Separation
- Feasibility study on the preparation of zeolite membrane films on a thin, porous support sheet (50 µm thick)
- Zeolite sodium A (NaA) and silicalite zeolite frameworks are chosen to represent syntheses of zeolite membranes on the support
- Found that a dense, continuous intergrown zeolite crystal layer at a thickness less than 3 µm can be directly deposited with excellent adhesion
- Molecular-sieving functions of the prepared membranes are characterized with ethanol/water separation, CO2 separation, and air dehumidification
- Results show great potential for a range of energy conversion and environmental applications.
Thin Porous Metal Sheet-Supported NA Zeolite Membrane for Water/Ethanol Separation
- An ultra thin (<\2 µm) NaA zeolite membrane is directly deposited on a thin (∼50 µm) porous metal support sheet with good adhesion and high quality for the first time.
- A water/ethanol selectivity greater than 10,000 and water permeation flux above 4 kg/(m2 h) were demonstrated with water/ethanol feed mixtures over a range of water contents and separation temperatures.
- A H2O-facilitated ethanol transport model is proposed to explain the decrease of the H2O/ethanol selectivity with increasing water content in the feed mixture.