Asahi Kasei Kogyo Kabushiki Kaisha

Kazuo Imamura

Tetsuya Miyake

Kunihiko Takeda

Akihiko Ikeda

Kohji Noguchi

Maomi Seko

Yoshito Ikada

Tetsuo Watanabe

Hikaru Konishi

Hiroo Nakano

Eugene Corretge

Kazushige Seita

An improved regenerated cellulose membrane formed by ester-bonding an organic carboxylic acid or a functional derivative thereof to a polymeric membrane composed of a regenerated cellulose. This regenerated cellulose membrane exhibits an improved blood compatibility without lowering the dialysis performances of a regenerated cellulose membrane.

Regenerated cellulose membrane and processes for preparation thereof

A blood-purifying regenerated cellulose membrane, in which the occurrence of the leukopenia phenomenon and the activation of the complement system are moderated, is prepared by applying a solution of a polymeric substance comprising as one component units derived from one or more basic vinyl monomers having an amino group in the side chain in an organic solvent to a regenerated cellulose membrane, removing the excessive solution, and then fixing the polymeric substance to the regenerated cellulose membrane.

Blood-purifying membrane

A process for preparing simultaneously pyridine bases including 2-methylpyridine and 4-methylpyridine, occasionally, together with pyridine from acetaldehyde and ammonia by gas phase catalytic reaction, characterized in that the gas phase catalytic reaction is conducted in the presence of a catalyst prepared by (A) incorporating at least one compound containing at least one metal selected from the group consisting of tungsten, manganese, nickel, iron, cobalt, molybdenum, uranium, lead, silver, copper and tin into silica-alumina simultaneously with preparation of the silica-alumina, or (B) subjecting silica-alumina to ion exchange with ions of at least one metal selected from the group consisting of manganese, nickel, iron, cobalt, uranium, lead, silver, copper and tin to adsorb the ions on said silica-alumina. According to the process of the present invention, there can be obtained the desired pyridine bases in high yield, whereas formation of by-products including high boiling point pyridine derivatives is remarkably suppressed. The catalyst employed in the present process has a high resistance to the reaction atmosphere.

Process for preparing pyridine bases

An anion exchange resin particle provided with specific structure as well as specific functional groups is found to be suitable for uranium technology, especially for separation of uranium isotopes.

Redox uranium isotope separation using anion exchangers

A method of producing a polar, porous polymer comprising polymerizing a monomer mixture comprising:

Production of porous polymers

An anion exchange column, containing anion exchange resin particles with uniform degree of sphericity, restricted average diameter and uniform particle size distribution and having devices for flowing a liquid uniformly, is suitably used for uranium technology, especially for separation of uranium isotopes.

Growing community of inventors

Yokohama, Japan

Kazuo Imamura