Patent application number | Description | Published |
20090007780 | METHOD OF DEHYDRATION, DEHYDRATING APPARATUS, AND MEMBRANE REACTOR - A dehydration method by which water is selectively separated from a water-containing mixture | 01-08-2009 |
20090011926 | PROCESS FOR PRODUCING DDR TYPE ZEOLITE MEMBRANE - A method for producing a DDR type zeolite membrane, comprising immersing a porous substrate in a raw material solution containing 1-adamantanamine, silica, and water; and carrying out a hydrothermal synthesis of DDR type zeolite in the presence of a DDR type zeolite seed crystal (seed crystal) to form a DDR type zeolite membrane on the surface of the porous substrate by making a content ratio of 1-adamantanamine to silica (1-adamantanamine/silica) in the range of 0.002 to 0.4 in terms of molar ratio and a content ratio of water to silica (water/silica) in the range of 10 to 500 in terms of molar ratio, and an average particle diameter of the seed crystal to 300 nm or less to provide a method for producing stably a DDR type zeolite membrane of uniform and thin membrane thickness with high gas permeability. | 01-08-2009 |
20100144512 | METHOD FOR PRODUCTION OF DDR TYPE ZEOLITE MEMBRANE - A method for producing a DDR type zeolite membrane, which method comprises a membrane formation step of immersing a porous substrate having a DDR type zeolite seed crystal adhered thereon, in a raw material solution containing 1-adamantaneamine, silica (SiO | 06-10-2010 |
20100298115 | METHOD FOR MANUFACTURING A STRUCTURE PROVIDED WITH DDR ZEOLITE MEMBRANE - A method for manufacturing a DDR zeolite membrane element including the steps of: immersing a porous substrate in a raw material solution, forming a DDR zeolite membrane containing 1-adamanthanamine on a surface of the porous substrate by subjecting a DDR zeolite to hydrothermal synthesis in the presence of DDR zeolite seed crystals, applying a glass paste onto the surface of the porous substrate so as to contact the membrane, and heating the membrane at 500 to 800° C., thereby burning away the 1-adamanthanamine contained in the membrane and melting the glass paste to form a membrane-like glass seal contacting the membrane on the surface of the porous substrate. The method for manufacturing a DDR zeolite membrane element can inhibit the permeation of the DDR zeolite membrane from being hindered in a contact portion between the membrane and the glass seal and inhibit poor seal of the glass seal. | 11-25-2010 |
20110287261 | DDR-TYPE ZEOLITE POWDER, AND PROCESS FOR THE PRODUCTION OF DDR-TYPE ZEOLITE POWDER - There is provided a DDR-type zeolite powder composed of fine particles and exhibits a particle size distribution where the majority of the particles have particle diameters converging in the vicinity of the mean particle diameter, and a process for the production of the same. Specifically provided is a process for the production of a DDR-type zeolite powder, which comprises a step of heat-treating a raw material solution at 100 to 180° C., and thereby growing crystals until the mean particle diameter reaches to a level of 0.1 μm or more and below 2.5 μm. | 11-24-2011 |
20110301017 | PROCESS FOR THE PRODUCTION OF DDR-TYPE ZEOLITE MEMBRANES - A process for production of a DDR-type zeolite membrane, which comprises: both a seed crystal-forming step of immersing a porous substrate in a seed crystal-forming raw material solution which contains a DDR-type zeolite powder dispersed therein and performing hydrothermal synthesis to form plural DDR-type zeolite crystal particles on surface of the porous substrate, and a membrane-forming step of immersing the resulting porous substrate with DDR-type zeolite crystal particles on the surface in a membrane-forming raw material solution which is free from DDR-type zeolite powder and performing hydrothermal synthesis to form a DDR-type zeolite membrane on the surface of the porous substrate. According to the process, a dense DDR-type zeolite membrane can be formed, and the vessel used in the synthesis can be prevented from being damaged. | 12-08-2011 |
20120213696 | PROCESS FOR PRODUCTION OF DDR-TYPE ZEOLITE - There is provided a process for producing a DDR-type zeolite having: a raw material solution preparation step of preparing a raw material solution containing 1-adamantaneamine hydrochloride, silica (SiO | 08-23-2012 |
20120272826 | ZEOLITE MEMBRANE AND PROCESS FOR PRODUCING ZEOLITE MEMBRANE - There are provided a process for producing a zeolite membrane which, even when large, has few defects and which has higher separation performance than conventional zeolite membranes, and a zeolite membrane obtained by the process. In the process, the structure-directing agent is removed in the atmosphere having an O | 11-01-2012 |