Of Naa Zeolite Membrane Synthesis And Permeation Studies

Zeolite membrane have been attracted much during the last decade because of their unique characteristics, such as thermal, chemical and structural properties compared to polymeric membranes, and great potential applications in the separation. Because of the small pore size (0.41nm) and its hydrophile property, NaA zeolite membrane can be used in the separation of small molecules or separating water from organic substance by penetration.The main work of this thesis is1. In the process of synthesizing NaA zeolite, the influence of crystallization temperature, crystallization solution, crystallization time was studied thoroughly. The result showed that the best crystallization solution was Na2O:SiO2.Al2O3.H2O=7.5:2:1:600, the best crystallization temperature was 95-98 C and the crystallization time was 3-4h. The crystal of NaA zeolite was cube with 2.5 m side.The other crystal in the process of synthesizing NaA zeolite was zeolite P. The process of baking NaA zeolite was set according to TGA.2. Effectsof some important factors on the preparation of zeolite membranes are thoroughly studied. The NaA zeolite membrane was prepare on the a-Al2O3 support. The penetration of H2, N2 and C3Hg were 1.52 10-6mol/m2s-Pa, 3.71 10-7 mol/m2-s-Pa, 3.11 10-7 mol/m2-s-Pa correspondingly. The ideal selectivities of H2/N2, HT/ C3Hg were 4.10, 4.89.3. NaA zeolite membrane was synthesized on a porous a-Al2O3 tube support's inner surface by a dynamic hydrothermal method. The thickness of membrane was 20 m and zeolite crystals were cubes without side. The penetration of H2 , N2 and C3H8 were 7.66 10-7mol/m2-s-Pa, 2.32 10-7mol/m2-s-Pa, 1.58 10-7mol/m2-s-Pa correspondingly. The ideal selectivities of H2/N2, H2/ C3H8 were 3.38, 4.87.