Hitachi Zosen Corporation

The School Corporation Kansai University

Kanadevia Corporation

Satoshi Imasaka

Masaya Itakura

Sadao Araki

Kazuhiro Yano

Hideki Yamamoto

Tetsuya Inoue

Kentaro Shinoya

Yasuhisa Hasegawa

Hiroyasu Ishii

Koichi Sato

Provided are an all-silica zeolite separation membrane for separating carbon dioxide, etc., and not causing a decrease in the processing amount due to adsorption of water molecules, and a production method therefor. One aspect of the present invention is a zeolite separation membrane, in which the framework of a zeolite crystal structure formed on a porous support is all silica, characterized in that the zeolite crystal structure formed on the porous support is fluorine free. Another aspect of the present invention is a method for producing a zeolite separation membrane having a zeolite crystal structure on a porous support, characterized in that the method includes a step of producing a seed crystal, a step of applying the seed crystal onto the porous support, a step of producing a membrane synthesis raw material composition, and a step of immersing the porous support having the seed crystal applied thereon in the membrane synthesis raw material composition and performing hydrothermal synthesis, and the membrane synthesis raw material composition contains a silica source and an organic template and does not contain a fluorine compound.

Zeolite separation membrane and production method therefor

The present invention provides a titanosilicate separation membrane which can also be used for separating a mixed gas containing a molecule having a relatively small size, has high durability in a high temperature environment, and has a high permeation rate and a high selectivity for a mixed gas containing water vapor. A titanosilicate separation membrane has a CHA-type titanosilicate crystal structure formed on a porous support, wherein aluminum is not substantially contained in the backbone of the titanosilicate crystal structure, and the titanosilicate crystal structure is constituted by silicon, oxygen, and titanium.

CHA-type titanosilicate separation membrane and production method therefor and gas separation method

Provided is a method for producing a separation membrane including a silicalite membrane without using NaOH or the like that causes an increase in cost with respect to equipment, facilities, and process time. The method for producing a separation membrane is a method for producing a separation membrane including a porous support and a silicalite membrane that is formed on the support and has an MFI-type zeolite crystal structure, and is characterized in that the method includes a step of producing a seed crystal, a step of attaching the seed crystal onto the porous support, a step of producing a membrane synthesis raw material composition containing SiO, an organic template, and HO, and a step of immersing the porous support having the seed crystal attached thereto in the membrane synthesis raw material composition and performing hydrothermal synthesis, and the composition ratio of the membrane synthesis raw material composition is as follows: SiO:organic template:HO=1:(0.05 to 0.15):(50 to 120).

Method for producing separation membrane using MFI-type zeolite (silicalite)

One object of the present invention is to provide a zeolite membrane that can achieve both practically sufficient separation performance and throughput and maintain the separation performance stably for a long period. Provided is a method of producing a zeolite membrane having CHA crystal structure on an intermediate layer of a porous support, wherein Si/Al (a molar ratio) of CHA zeolite particles is from 9.5 to 100.5 and, in an X-ray diffraction pattern obtained by applying X-ray onto a surface of the zeolite membrane, a peak intensity near 2&#x3b8;=18&#xb0; is less than 0.5 times a peak intensity near 2&#x3b8;=21&#xb0;, and/or a peak intensity near 2&#x3b8;=10&#xb0; is less than 4 times a peak intensity near 2&#x3b8;=21&#xb0;, the method including: forming the zeolite membrane having the CHA crystal structure on the intermediate layer of the porous support by hydrothermal synthesis, using an aqueous reaction mixture including a Si element source, an Al element source, an alkali source, and an organic template, wherein non-dealuminated FAU zeolite is used as the Si element source and the Al element source.

Zeolite membrane, production method therefor, and separation method using same

A carbon nanotube sheet includes a carbon nanotube layer containing numerous vertically aligned carbon nanotubes and a fibrous carbonized layer that retains the proximal end portions of the carbon nanotubes. The carbon nanotube layer is configured such that the proximal end portions and distal end portions of the carbon nanotubes are inclined and the intermediate portions of the carbon nanotubes are entangled with one another.

Growing community of inventors

Osaka, Japan

Satoshi Imasaka