Process for producing zeolite separation membrane
View Patent ↗The present invention provides a process for production of a zeolite separation membrane with satisfactory separation performance. The process for production of a zeolite separation membrane according to the invention is comprising: a seed crystal-attaching step in which: a sealed body ( 10 ), which is obtained by sealing both ends of a cylindrical porous body ( 11 ) with sealing members ( 12 a , 12 b ), is immersed from the sealing member ( 12 a ) end into a suspension ( 22 ) containing zeolite seed crystals; the suspension ( 22 ) is allowed to permeate from the exterior of the porous body ( 11 ) to the interior thereof; the zeolite seed crystals are thereby attached to the porous body ( 11 ); and a seed crystal-attached porous body is obtained; and a zeolite membrane-forming step in which: the seed crystal-attached porous body is contacted with a reaction solution containing the raw material of a zeolite membrane; the zeolite membrane is formed on the porous body ( 11 ); and a zeolite separation membrane is obtained.
1. A process for production of a zeolite separation membrane, comprising:
a seed crystal-attaching step in which: a tubular porous body, wherein one end is sealed with a sealing member and the other end is open, is immersed from the sealing member end into a suspension containing zeolite seed crystals while keeping the interior of the tubular porous body open to air; the suspension is allowed to permeate from the exterior of the tubular porous body to the interior thereof by hydraulic pressure of the suspension; the zeolite seed crystals are thereby attached to the exterior of the tubular orous body; and a seed crystal-attached porous body is obtained; and
a zeolite membrane-forming step in which: a zeolite membrane is formed on the exterior of the tubular porous body by contacting the exterior of the seed crystal-attached tubular porous body with a reaction solution containing the raw material of the zeolite membrane; and a zeolite separation membrane is obtained.
2. The process for production of a zeolite separation membrane according to claim 1 , wherein:
the sealing member is provided in a detachable manner on the porous body; and
between the seed crystal-attaching step and the zeolite membrane-forming step, or after the zeolite membrane-forming step, the sealing member is detached from the porous body.
3. The process for production of a zeolite separation membrane according to claim 1 , wherein:
the open end of the tubular porous body does not have a sealing member, or the open end has a sealing member with an open air means.
4. The process for production of a zeolite separation membrane according to claim 1 , wherein:
the mean pore size of the pores of the tubular porous body is 0.1 μm to 20 μm and the porosity of the porous body is 5% to 50%.