Liquid-phase mass-transfer coefficients of Mellapak structured packings under desorption of oxygen from primary alcohols

Abstract

Volumetric mass-transfer coefficient in the liquid phase, kLa, for Mellapak 250.Y, 350.Y and 500.Y structured packings has been measured by standard method of desorption of oxygen into nitrogen from pure methanol, ethanol and n-propanol in the column of i.d. of 150 mm. Although utilization of organic solvents for absorption experiments provides valuable behavior interlink between properties of aqueous absorption systems and ordinary (organic) systems under distillation conditions, studies of such kind are not published in the open literature. The behavior of the kLa data on alcohol systems do not differ significantly from that found for aqueous system, the kLa values rise with the liquid load powered to â\u88¼0.5â\u80\u930.78. For one solvent the kLa are almost identical for all three packings under the same liquid load. According to the expectations the kLa values under the same superficial liquid flow rate are highest for the solvent with the lowest viscosity and the highest diffusivity of oxygen, methanol, and decrease in the order ethanol, n-propanol and water. The kLdata for all three packings, alcohols and also for water has been successfully correlated by dimensionless correlation Sh = 0.207 â\u88\u99 Re0.798Frâ\u88\u920.563We0.511Sc0.528with mean relative deviation of 12%

Progress Towards a Comprehensive Model for Mass Transfer in Structured Packings

“…Other researchers have also measured the interfacial area participating in mass transfer for structured packings. 30,31 Data Analysis…”

Progress Toward a Comprehensive Model for Mass Transfer in Structured Packings

“…These experiments help to deconvolute the aforementioned statistical difficulties that arise from total reflux experiments and also help to isolate the calculation of the interfacial area in the products k x a m and k y a m . Other researchers have also measured the interfacial area participating in mass transfer for structured packings. , …”

“…Other researchers have also measured the interfacial area participating in mass transfer for structured packings. 31,32 ■ DATA ANALYSIS Preliminaries. Our data set included 444 individual ⟨HETP⟩ points for a variety of chemical systems and packing styles.…”