Ministry of International Trade & Industry

Agency of Industrial Science and Technology

Agency of Industrial Science and Technology Ministry of International

Agency of Industrial Science

Toshiaki Mori

Kenzi Suzuki

Masakazu Horio

Keiichi Inukai

Shinji Tomura

Yasuji Sakaguchi

Hiroyuki Masuda

Separation of nitrogen and carbon dioxide is accomplished by a method using as a separating material one member selected from the group consisting of sepiolite in the unmodified form, sepiolite which has been heat-treated, and sepiolite which has had part or the whole of the exchangeable cation thereof replaced with zinc ion and which has been subsequently subjected to a heat treatment.

Method for separation of nitrogen and carbon dioxide by use of ceramic

A pillared clay possessing the ability to exchange cations is produced by a method which comprises heating a cation-exchange clay consisting of (1) silicate layers composed of octahedrons of alumina having part of the aluminum thereof substituted by magnesium or octahedrons of magnesia having part of the magnesium thereof substituted by lithium and tetrahedrons of silica and parallelly arranged in a state assuming negative electric charge and (2) exchangeable cations interposed between the silicate layers in a state retaining an electric charge balance with the negative electric charge of the silicate layers, thereby causing part of the exchangeable cations to be fixed in the silicate layers and inducing a decrease in the cation-exchange capacity of the clay, then cross-linking the interstices between the silicate layers of the clay, and thereafter causing liberation of the fixed cations. By causing a pillared clay which possesses the ability to exchange cations to be further cross-linked with pillars different from the pillars used in the clay, a pillared clay having pillars of a plurality of kinds is produced. By causing a pillared clay which possesses the ability to exchange cations to be further cross-linked with pillars identical with the pillars used in the clay, a pillared clay containing increased amounts of pillars is obtained.

Method for production of pillared clay having cation-exchange capacity

An interlayer cross-linked smectite is produced by a method which includes the steps of preparing a smectite suspension containing a dissolved water-soluble macromolecular compound, adding a cationic hydroxide oligomer to the suspension thereby subjecting the exchangeable cation in the smectite to ion exchange, allowing the resultant smectite suspension to stand at a fixed temperature for a fixed time thereby allowing the cationic hydroxide oligomer of the smectite to age, separating a solid smectite from the resultant suspension, and heating the separated solid smectite. The interlayer interval of the produced smectite can be controlled by adjusting the amount of the cationic hydroxide oligomer.

Method for production of silicate interlayer cross-linked smectite

A pillared clay possessing a desired amount of pillers is produced by heating clay thereby changing the cation-exchange capacity owned by the clay and then adding a cation oligomer as a pillar precursor to the clay thereby causing the oligomer to exchange ion with the cation of the clay.

Method for production of pillared clay

The cation-exchange capacity of montmorillonite decreased in consequence of fixation of ion is restored by subjecting the montmorillonite to a hydrothermal treatment.

Growing community of inventors

Yokkaichi, Japan

Toshiaki Mori