Method and apparatus for manufacturing zeolite membrane, and zeolite tubular separation membrane provided by the method
View Patent ↗A process for manufacturing a zeolite membrane by hydrothermal synthesis on the surface of a porous tubular support 3 with both ends open, by adding a reaction solution containing a silica source and an alumina source and the porous tubular support 3 into a lengthwise reaction container 1 longer than the porous tubular support 3 while placing the porous tubular support 3 vertically in the reaction container 1 and substantially apart from the inner surface of the reaction container 1 , and immersing the porous tubular support 3 completely in the reaction solution so that the inside of the porous tubular support 3 is filled with the reaction solution; and heating the reaction solution under conditions of leaving the top and bottom ends of the porous tubular support 3 open, and an apparatus using thereof and zeolite tubular separation membranes thus obtained.
1. A zeolite tubular separation membrane comprising a porous tubular support with both ends open and a zeolite membrane which is formed with plural number of A-type zeolite single crystals on a surface of the porous tubular support, wherein A-type zeolite single crystals exposed on the surface of the zeolite membrane each have a growth axis almost perpendicular to the surface of the porous tubular support, and wherein the membrane has grain boundary layers of 5-50 nm in thickness in spaces among the A-type zeolite single crystals exposed on the surface of the zeolite membrane.