Absorption of oxygen in countercurrent multistage bubble columns—III Viscoelastic liquids. Comparison of systems with high viscosity

✍ Scribed by V. Hecht; J. Voigt; K. Schügerl

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 465 KB
• Volume: 35
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(80)85125-6

✦ Synopsis

The volumetnc mass transfer coeficlents, kLa, were measured by a steady state method m the first stage of a multrstage countercurrent column 20 cm III drameter Perforated plate trays with different bore hole diameters and free cross sectlonal area were employed The height of the skage was vaned Vfscoelastlc flurds (PAA) soluhons) were used as me&a In general k~a increases with mcreasmg superficial gas velocity, with decreasing bore hole diameter and free cross sectIona area of the perforated plate trays as well as with decreasmg concentration and viscosity With mcreasmg height of the bubbling layer /cLn dimmrshes This effect IS lower wdh an Increase of PAA concentrahon A quahtatlve comparison of the rheologcally correspondmg media mduzates that under srnular conditions PAA solutions yield the tughest, and the glycerol solution the lowest kLo values Wtth mcreasmg specific power Input k~a becomes larger At constant power mput the highest k~a IS attamed with the smallest bore hole diameter of the trays for CMC and PAA solutions For glycerol no such effect was found