A continuous multi-stage countercurrent leaching process is designed to exact hydrocarbons (solute) from oil sands using recycled water as solvent. The feed stream of 300 kg/h contains 85.0 wt% inert solids (B), 10.0 wt% hydrocarbons (A) and 5.0 wt% of water (C).

We propose a method for measuring gas and liquid diffusivities of surface active solutes based on the measurements of dynamic interfacial tension. The selection of the experimental system needed to achieve accurate diffusivity estimation and, particularly, the selection of the complementary fluid to create the interface sensitive to the solute …

An equation to predict the temperature dependence of solute impurity diffusivity in liquid metals has been derived by combining the Sutherland-Einstein formula with Kaptay's unified equation on the dynamic viscosity of liquid metals. It has been demonstrated that consideration of the temperature dependence of the atomic radius of the diffusing species results in better …

Leaching is a step in hydro- and electrometallurgical processes and has been also employed for the recovery of metals from waste of electrical and electronic equipment (WEEE). The process may be preceded by a mechanical pretreatment of the waste (see Chap. 6) and followed by purification and metal recovery from the solution (see Chaps. 8 and 9 ...

This challenge is particularly true in the extreme case of ionic liquids (ILs), fluids composed entirely of cations and anions. Solute diffusivities in ILs show a strong concentration dependence, broadening the already vast IL design space and rendering conventional, sample-by-sample measurements impractical for screening.

The extraction of a solute from a solid matrix involves a three-stage process: desorption of the solutes and solubilisation in the solvent, internal diffusion through the solid phase towards the surface and external solute …

For the solute studied, a reduction in effective diffusion coefficient was observed with a retardation of solute flux in both aqueous and calf meat layers. ... in beef semitendinosus is 1.1 × 10 −10 m 2 /s is in very good agreement with Schwartzberg and Chao's study on solute diffusivities in leaching process (1981).

Tomasula and Kozempel(1989) have reported on the leaching of glucose, potassium and magnesiumfrom French fry-cut Maine Russet Burbank and Maine Katahdin potatoes over a range of 4%90°C and modeled effective diffusivities as functions of Authors Gekas and Lamberg are with the Dept. of Food Engineering, Chemical Center, Univ. of Lund, P.O. Box ...

Mineral leaching is the key unit operation in metallurgical processes and corresponds to the dissolution of metals. The study of leaching is carried out in many areas, such as geology, agriculture and metallurgy. This …

SOLUTE DIFFUSIVITIES IN LEACHING PROCESSES Author SCHWARTZBERG HG; RONG YUE CHAO UNIV. MASSACHUSETTS, DEP. FOOD ENG./AMHERST MA 01003/USA …

Solute diffusivities in ILs show a strong concentration dependence, broadening the already vast IL design space and rendering conventional, sample-by-sample measurements impractical for screening.

Journal of Food Engineering 4 (1985) 313-323 Research Note Diffusivities of Volatiles in Concentrated Solutions ABSTRACT Concentration profiles obtained by slicing a cylindrical gel were used to measure diffusion of volatiles in viscous aqueous dextrose solutions.

Mineral leaching is the key unit operation in metallurgical processes and corresponds to the dissolution of metals. The study of leaching is carried out in many areas, such as geology, agriculture ...

Solute diffusivities in leaching processes. Food Technol., 36 (1982), pp. 73-86. Google Scholar. Tomasula and Kozempel, 1989. P. Tomasula, M.F. Kozempel. Diffusion coefficients of glucose, potassium, and magnesium in Maine Russet Burbank and Maine Katahdon potatoes from 45 to 90 °C.

focuses on the mathematical formulation for the calculation of effective diffusivities considering different diffusion models based on Fick's second law of diffusion.

Solute diffusivities in leaching processes. Le present travail de these porte sur l'etude de l'effet de la texturation par Detente Instantanee Controlee (DIC) sur l'operation d'extraction solide liquide d'oligosaccharides a partir des graines… Mechanisms of folate losses during processing: …

The nature of the diffusion process (in terms of the amount of dye diffused into the gel) was studied using image analysis techniques. ... Solute diffusivities in leaching processes. Food Technology, 36 (2) (1982), pp. 73-86. Google Scholar. Sebti et al., 2004.

Leaching is the process of a solute becoming detached or extracted from its carrier substance by way of a solvent. Leaching is a naturally occurring process which scientists have adapted for a variety of applications with a variety of methods. Specific extraction methods depend on the soluble characteristics relative to the sorbent material ...

OD process water is extracted from the solid, while in the leaching process solute is extracted from the material and water is absorbed. These phenomena occur because of the differences between chemical potentials of the solute and water in the solid and solution. Both solute and moisture transfers in the soaking process are affected by operating

Mathematical prediction of leaching losses of water soluble vitamins during blanching of peas. International Journal of Food Science and Technology, 20. G. SchwartzbergH, Y. ChaoR (1982) Solute diffusivities in leaching processes. Food Technology, 36

pure solid crystalline phase. When solute concentration becomes higher than its solubility at certain temperature, the solute comes out of the solution and forms a crystal. Membrane separation- This process predominately involves the diffusion of a solute from a liquid or gas through a semi- permeable or microporous membrane to

Leaching – Organic Materials ..... 540 10.1 Definition of Process ..... 540 10.2 Contacting Methods ..... 540 10.3 Industrial Leaching Equipment ..... 541 This page has been reformatted by Knovel to provide easier navigation. ... 555 10.9 Solute Diffusivities ..... 557 10.10 Fixed Beds ..... 558 10.11 Axial Dispersion and Flow Maldistribution ...

(Schwartzberg and Chao, 1982). The study of processes involved in osmotic dehydration, as well as mass transfer simulation and modeling, is a useful predictive tool for the food industry, ... R. Y. Chao, Solute diffusivities in leaching process. Food Technology, V.36, 73-86, (1982). Figures used in the abstract Figure 1: Tetrahedral mesh with ...

The extraction of a solute from a solid matrix involves a three-stage process: desorption of the solutes and solubilisation in the solvent, ... Schwartzberg H.G., Chao R. Solute diffusivities in leaching processes. Food Technol. 1982; 36:73–86. [Google Scholar] 23.

Assuming no chemical reaction and using appropriate solutions of the unsteady state diffusion equation for square parallelpiped geometry, the apparent diffusivities, D a, of reducing sugars in the potato matrix were determined at different temperatures. the incorporation of the dimensions of the strips in the solution of the diffusion equation ...

Extraction Process Design. Q. Tuan Pham PhD, Q. Tuan Pham PhD [email protected] School of Chemical Engineering, University of New South Wales, Sydney, Australia. ... (Leaching) Supercritical Fluid Extraction. Hygienic Design Aspects. Economics. Summary and Future Needs. Nomenclature.

Solute diffusivities in leaching processes. Article. Jan 1982; Henry Schwartzberg; R.Y. CHAO; View. Long-term accumulation and retention of Al, Fe and P in peat soils of northern treatment wetlands.

The extraction process also depends on how fast the compound will dissolve and reach the equilibrium concentration in the liquid. Four mass transfer steps are involved but the diffusion of the dissolved solute within the solid into the solvent is the rate limiting step (Gertenbach, 2001).The rate of diffusion of that step can be described by Fick's second law: …

This paper has the following objectives: (i) to review the data concerning the diffusion coefficients of solutes in different cheese types; (ii) to review the experimental methods available to model …

Mathematical prediction of leaching losses of water soluble vitamins during blanching of peas. STELLA M. ALZAMORA, Corresponding Author. STELLA M. ALZAMORA. Proipa (CONICET-FCEyN), Departmento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Capital Federal Argentina ...