Asahi Kasei Kogyo Kabushiki Kaisha

Hideo Fukuda

Hatsuki Onitsuka

Tadahiro Kobayashi

Eiichi Wakita

Yukio Matsubayashi

Shin Saito

When a packed column having a pressure-absorbing mechanism satisfies the following conditions, the pressure absorbing mechanism has a sufficient packings-supporting ability in spite of its simplicity, the disorder of flow of fluid is slight and the effect of separation of materials is high: (1) the inside diameter (D cm) is 10 cm or more, (2) the aforesaid pressure-absorbing mechanism comprises solid parts and passage spaces through which packings can pass, (3) the specified circumference ratios of most of said passage spaces are 10/D or more and their lengths in the flow direction are larger than the -1.5th power of the circumference ratio, (4) the above passage spaces exist within 1 cm from any position on the upper and lower sides of the aforesaid solid parts, and (5) the specified shielding degree of the pressure-absorbing mechanism is 0.01 or more and 0.8 or less.

Packed column having pressure-absorbing mechanism

A bulky non-woven fabric of improved softness and uniformity in surface density, flatness and thickness is provided. The non-woven fabric comprises (a) 50 to 95% by weight of spontaneously crimped acrylonitrile polymer fibers having lengths of 4mm to 20mm and at least 20 crimps per inch of length, said acrylonitrile polymer consisting essentially of, in polymerized form, 80 to 100% by weight of acrylonitrile and 0 to 20% by weight of a copolymerizable monoethylenically unsaturated monomer, and (b) 5 to 50% by weight of fibrillated fibers of at least one acrylonitrile polymer, said acrylonitrile polymer comprising, in polymerized form, 60 to 98% by weight of acrylonitrile and 2 to 40% by weight of a copolymerizable monoethylenically unsaturated monomer having a carboxyl group or an amide or N-alkyl substituted amide group. The non-woven fabric is in the form of a web having a structure such that said spontaneously crimped fibers are entangled with both each other and with said fibrillated fibers, and having an apparent density of 0.05 to 0.25 g/cm.sup.3.

Growing community of inventors

Fuji, Japan

Hideo Fukuda