Ngk Insulators, Inc.

Kunio Nakayama

Kenji Yajima

Toshihiro Tomita

Kenji Suzuki

Manabu Yoshida

Hisayoshi Nonaka

Makiko Niino

A porous substrate with a seed crystal-containing layer for manufacturing a zeolite membrane includes: a ceramic porous substrate, and a seed crystal-containing layer containing a zeolite powder to function as a seed crystal for forming a zeolite membrane and a ceramic powder and being loaded on a surface of the ceramic porous substrate and fired to fix the seed crystal-containing layer on the porous substrate. The porous substrate with a seed crystal-containing layer used for manufacturing a zeolite membrane inhibits a defect such as a crack from being generated in the zeolite layer upon manufacture or use by manufacturing a zeolite membrane by the use of the substrate which then can be subjected to air-spraying, washing, and processing for the purpose of removing a foreign substance, etc., prior to hydrothermal synthesis.

Porous structure with seed crystal-containing layer for manufacturing zeolite membrane, zeolite membrane, and method for manufacturing zeolite membrane

A dehydration method by which water is selectively separated from a water-containing mixturewith a separation membrane. The separation membrane is a DDR type zeolite membrane. The dehydration method includes bringing the mixtureinto contact with one side of the DDR type zeolite membraneand causing a pressure difference between that side of the DDR type zeolite membranewhich is in contact with the mixture and the other side of the DDR type zeolite membraneto thereby cause the water to selectively permeate and separate out. By the dehydration method, water can be selectively separated from a water-containing mixture without the need of a high energy cost. The separation membrane has excellent acid resistance.

Method of dehydration, dehydrating apparatus, and membrane reactor

A gas separator is provided, including a porous substrate made of a first ceramic and a gas-separating layer containing zeolite disposed on the surface of the porous substrate. The gas-separating layer further contains, in addition to zeolite, a thermal expansion coefficient-adjusting material made of a second ceramic having a linear thermal expansion coefficient satisfying a predetermined relationship, so that the difference between the thermal expansion coefficient of the porous substrate and the gas-separating layer can be reduced.

Gas separating body and method for producing same

A DDR type zeolite membrane formed on a substrate includes silica as a main component. The DDR type zeolite membrane separates at least one type of a gas component from a mixed gas containing at least two types of gases selected from a group consisting of carbon dioxide (CO), hydrogen (H), oxygen (O), nitrogen (N), methane (CH), normal butane (n-CH), isobutane (i-CH), sulfur hexafluoride (SF), ethane (CH), ethylene (CH), propane (CH), propylene (CH), carbon monoxide (CO), and nitrogen monoxide (NO). Each single gas permeance at room temperature and 100&#xb0; C. are different, respectively, in order to separate at least one selected gas component from the mixed gas.

Method for preparing DDR type zeolite membrane, DDR type zeolite membrane, and composite DDR type zeolite membrane, and method for preparation thereof

This invention provides a DDR type zeolite membrane, characterized in that it is formed as a membrane on a substrate and its main component is silica, and that each single gas permeance at room temperature and 100&#xb0; C. are different, respectively among at least two types of gases selected from a group consisting of carbon dioxide (CO), hydrogen (H), oxygen (O), nitrogen (N), methane (CH), normal butane (n-CH), isobutane (i-CH), sulfur hexafluoride (SF), ethane (CH), ethylene (CH), propane (CH), propylene (CH), carbon monoxide (CO), and nitrogen monoxide (NO).

A method for producing a zeolite composite membrane in which a zeolite membrane is formed on a porous substrate includes the steps of: coating a zeolite membrane on a porous substrate made of zeolite having the same or a similar composition as the zeolite membrane and containing the same template as the zeolite membrane; and calcining the porous substrate having the zeolite membrane thereon to remove the template from the zeolite membrane and the porous substrate at once. A zeolite composite membrane that does not have cracks can be obtained by almost equalizing thermal expansion coefficients of the porous substrate and the zeolite membrane.

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Okazaki, Japan

Kunio Nakayama