Jackson group

Pulsed Packed Columns Any of the ordinaiy packings may be used, although random packings tend to orient on pulsing, which may lead to channeling. For this reason, Thornton [Chem. Eng. Prog., 50, Symp. Ser. 13, 39 (1954) Br. Chem. Eng., 3, 247 (1958)] recommends fixed packing made from plates of corrugated expanded metal. Polyethylene pacldng, not wet by aqueous solutions, provides higher flow capacities and mass-transfer rates than ceramic (wetted) packing [Jackson, Holman, and Grove, Am. Jn.st. Chem. Eng. J., 8, 659 (1952)]. Pulsing reduces the size of dispersed-phase droplets, increases holdup, and increases interfacial area for mass transfer. There is a  [c.1489]

Burdick Jackson Daicel Chemical Industries (Japan) Harcros Chemicals ICl Group (UK)  [c.132]

A. R. Haygarth-Jackson, Serials 85. Proceedings of the U. K Serials Group Conference, 29—47 (1985).  [c.133]

Early RGP Lenses. Because of poor oxygen permeabiUty, PMMA lenses can only be worn for daily wear. To overcome the poor oxygen permeabihty of PMMA lenses, other rigid polymers have been investigated for contact lens appHcation. One of the first polymer families to be successfrilly developed was the cellulose acetate butyrate [9004-36-8] (CAB) lenses (53,54), which showed oxygen permeabihty of 10—20 barriers, approximately two orders of magnitude increase in oxygen permeabihty than that of PMMA lenses. However, compared with PMMA lenses, CAB lenses had a higher tendency to warp, scratch, chip, and discolor. Another class of polymers evaluated for use as a hard lens material was styrenics. Poly -/-butylstyrene) [26009-55-2] has a higher free volume in the three-dimensional packing, due to the bulkiness of the /-butyl group, giving oxygen permeabihty of 25 barriers this value is considered to be high among the polymers evaluated for contact lens apphcation in the early 1970s. Poly -/-butyl-styrene) was commercialized as the Aidens contact lens by Wesley-Jessen. Although possessing good flexural strength, the material showed poor scratch resistance.  [c.102]

Indol, CgH N, is the mother substance of the indigo group of compounds. It exists in various essential oils including neroli oil and oil of jasmin flowers. It is a crystalline compound, melting at 52° and boiling at 253° to 254°. Its odour is powerful and disagreeable, being distinctly faecal in character. Its constitution is as follows —  [c.292]

See pages that mention the term Jackson group : [c.137]    [c.155]    [c.159]    [c.675]    [c.706]    [c.103]    [c.1091]   
Sourse beds of petroleum (1942) -- [ c.336 , c.337 ]