Daicel Chemical Industries, Ltd.

Kubota Corporation

Kazuhiro Yamazaki

Kimihiro Ishikawa

Yoshio Matsuzaki

Tomohiko Sasaki

Manabu Uchida

Shigeyuki Takahashi

Etsuo Ohtake

Kazunari Oota

Takamichi Miwa

A channel groove patternallowing the passage of a permeated liquid having passed through a filtration membraneis provided on one filtration plate surface of a filtration plate, and a permeated liquid outlet nozzleis provided on the filtration plate. The channel groove patternincludes multiple channel grooves, and a header groovefor averaging suction pressures is formed on the filtration plate. An area where the channel groove patternis formed is divided into upper and lower water collection areasandby the header groove. The permeated liquid outlet nozzleand the header groovecommunicate with each other through the channel groovesof the water collection area, and the channel cross-sectional area of the header grooveis larger than that of the channel groove

Membrane cartridge

Membrane cartridge for submerged membrane separation

Cellulose acetate is formed into porous, spherical particles, having an acetylation degree of 49 to 60%, a particle diameter of 0.05 to 10 mm, a sphericity of 0.7 or larger, a pore volume of 0.4 cc/g or larger and a collapsing strength of 9 kg or higher.

Porous spherical cellulose acetate particles

A porous cellulose acetate molding containing an odoriferous substance is provided which is prepared by incorporating an odoriferous substance in a porous molding comprising cellulose acetate having a combined acetic acid of 50 to 58%, a pore volume of at least 0.65 cc/g and a collapsing strength of at least 10 kg. Said porous cellulose acetate may be one which is surface-saponified. Examples of the odoriferous substances include volatile substances such as insect repellents, antibacterials and mold inhibitors. Said porous cellulose acetate molding can adsorb the odoriferous substances fully without substantially changing its shape and persistently volatilize the substance for a long time.

Cellulose acetate molding containing odoriferous substance

A concentrator including a vacuum evaporator having a cylindrical upper part and a lower part in the form of an inverted cone. A pipe for introducing a feedstock solution is installed with a downwardly opening end thereof positioned in substantially the center of the vacuum evaporator. A pipe is provided for removing solvent vapor from the evaporator, and a pipe is provided for recovering concentrated solution from the bottom of the evaporator.

Concentrator system

An annular valve seat comprises an annular elastic seat member of large width formed in its outer periphery with a circumferential groove having an enlarged bottom and a trapezoidal cross section, and an annular metal core substantially conforming to the groove in cross section and fitting in the groove. The seat is fitted to the inner surface of the case of the valve defining a flow passage. When the valve is installed in a piping system with pipe flanges fitting to the valve case at the opposite ends of its flow passage, the opposed pipe flange surfaces hold the opposite side faces of the valve seat in pressing contact therewith to tightly fit the seat to the case. The disk of the valve has stem holding bores each provided with cutouts extending inward axially thereof and also circumferentially of the disk at the upper end of the bore to permit escape of air from the bore. A circumferentially elongated planar contact face is formed on the peripheral portion of the disk where each stem projects from the disk. A similar contact face is formed on the elastic seat member in opposed relation to the contact face on the disk. The disk is turnable from its closed position with decreasing friction between the contact faces.

Growing community of inventors

Hyogo, Japan

Kazuhiro Yamazaki