Abstract A substantial effort has been made by numerous investigators to describe droplet breakage and coalescence in turbulent dispersions. An attempt is here improve these models based on existing frameworks recent advances described the literature. Two‐step mechanisms are considered for both models. The drop function structured as product of drop‐eddy collision frequency efficiency which reflect energetics liquid‐liquid retains former structure drop‐drop efficiency. model modified account...

A flash photomicrographic method and modified dye-light transmittance technique are employed to measure size distributions mixing frequencies in a turbulently agitated flow vessel. This liquid-liquid dispersion is nearly spatially homogenous. Mixing strongly dependent on impeller speed moderately holdup fraction.

Abstract The separation methods which are used in the hydro-metallurgical field reviewed and compared. Some processes solvent extraction use for recovery of crucial metals important to U.S. defense economy presented. Various commercial extractants categorized. Other such as liquid membranes ion exchange resins dilute metal ions summarized. These compared with extraction. Problems overcome further development these also identified discussed this paper.

The adsorption process of iodine, a major volatile radionuclide in the off‐gas streams spent nuclear fuel reprocessing, on hydrogen‐reduced silver‐exchanged mordenite (Ag 0 Z) was studied at micro‐scale. gas‐solid mass transfer and reaction involved were investigated evaluated with appropriate models. Optimal conditions for reducing (AgZ) hydrogen stream determined. Kinetic equilibrium data iodine Ag Z obtained by performing single‐layer experiments experimental systems high precision...

A supercritical (SC) fluid technology coupled with power cogeneration is proposed to produce biodiesel fuels without the conventional complex separation/purification steps. The core of integrated system consists transesterification (TE) various triglyceride sources (i.e., vegetable oils and animal fats) SC methanol/ethanol. Part reaction products can be combusted by a diesel engine in system, which, turn, provides needed pressurize heat exhaust gases for TE process. This article reports...

Supercritical transesterification of chicken fat with methanol was investigated at various temperatures (350, 375, and 400 °C), pressures (100, 200, 300 bar), methanol-to-chicken-fat molar ratios (from stoichiometric 3:1 to 12:1), residence times (3−10 min). The best experimental results for the conversion triglycerides decomposition glycerol fuel components were obtained under following conditions: °C, bar, methanol-to-triglycerides ratio = 9:1, time 6 min. thermal products long-chain...

The removal of mercury(II) from wastewaters (coal-fired utility plant scrubber solutions) using a thiol functional organoceramic composite (SOL-AD-IV) is investigated. A simulant employed as surrogate to demonstrate the mercury real waste solutions. Equilibrium studies show uptake capacity 500 mg/g at low concentration 0.5 mg/L and 726 saturation. Adsorption observed be independent in pH range 3−5. kinetic performance assessed on recycle batch reactor shows rapid rate adsorption. Selectivity...

Abstract The performance of a two‐phase liquid‐liquid continuous flow stirred tank reactor (CFSTR) was evaluated experimentally by simultaneous determination dispersed phase drop size distribution and extraction efficienty as function operating conditions. results provided basis against which predictions made previously developed simulation technique (Bapat et al., 1984) were compared. close agreement between the experimental validates rate models algorithm employed in this work.

Separation of neodymium(III) from aqueous solutions is investigated using an phosphorus based sol−gel adsorbent. This adsorbent has been formed by the synthesis method. The speciation diagram Nd(III) in phase with varying pH studied analyses equilibria equations. Batch adsorption equilibrium studies show increase neodymium uptake capacity range 0.5 to 6.5, and maximum at 6 observed be 1.13 mmol/g (160 mg/g). isotherm gives a satisfactory fit data. A kinetics study conducted different...

Separation of chromium(VI) from aqueous solutions is investigated using an imidazole functionalized sol−gel adsorbent. This adsorbent has been formed by the synthesis method. The speciation diagram Cr(VI) in system with varying pH studied analyses equilibria equations. Batch adsorption equilibrium studies show a decrease chromium uptake capacity increase range 2 to 9, and at 2.5 found be 2.93 mmol/g (152 mg/g). Langmuir isotherm gives satisfactory fit data. A kinetics study conducted...

This work is part of our continuing efforts to address engineering issues related the removal tritiated water from off-gases produced in used nuclear fuel reprocessing facilities. In current study, adsorption equilibrium on molecular sieve 3A beads was investigated. Adsorption isotherms for UOP were measured by a continuous-flow system at 298, 313, 333, and 353 K. Experimental data collected analyzed Generalized Statistical Thermodynamic (GSTA) isotherm model. The K+/Na+ molar ratio this...

A model is presented for the electrostatic corona discharge reactor (ECDR) in a pin-plate configuration. The main objective to describe fundamental chemistry and physics governing behavior predict ECDR performance under various operating conditions. electric field strength estimated assuming space-charge-free field. two-term spherical harmonic expansion used solve Boltzmann equation electron energy distribution function (EEDF) calculate electron-molecule reaction rates using collision...

Abstract A model which accounts for complex fluid‐fluid interactions and hydrodynamic effects in a fully baffled turbulently agitated dispersed phase system batch, semi‐batch, or continuous operation is developed. Both micromixing macromixing on particle size distributions are taken into account. Coalescence breakage functions developed examples given of the normalized number and/or volume various vessel regions. Calculated compared with experimental data to estimate values coalescence...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBUBBLE AND DROP PHENOMENABenjamin. Gal-Or, George E. Klinzing, and Lawrence L. TavlaridesCite this: Ind. Eng. Chem. 1969, 61, 2, 21–34Publication Date (Print):February 1, 1969Publication History Published online1 May 2002Published inissue 1 February 1969https://doi.org/10.1021/ie50710a006Request reuse permissionsArticle Views494Altmetric-Citations33LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads...

Iodine radioisotopes released during nuclear fuel reprocessing must be removed from the off-gas stream before discharge. One promising material for iodine capture is reduced silver mordenite (Ag0Z). Nevertheless, adsorbent's capacity will degrade, or age, over time when exposed to other constituents. Though overall impact of aging known, underlying physical and chemical processes are not. To examine these processes, Ag0Z samples were prepared aged in 2% NO2 dry air 1% NO N2 gas streams at...