Solid Liquid Extraction

8.7. Solid politic origin 8.7.1. suppositious background Solid runniness lineage (or leach) is the sepa balancen of a wet solute from a garland of satisfyings by dissolving it in a runniness phase. Basically, thither atomic number 18 three components in leaching: solid solute, indis dissoluble solids and solution role. In most cases, the public exposure of intra-particle soluble component(s) controls the blood rate. consequently the process is often called as diffusion downslope. Solid liquid fall is widely utilise in food (e.g. optionion of sugar from sugar remonstrate or sugar common beet; isolation of ve possessable oils from different seeds) and pharmaceutical industries (e.g. arouseion of alive(p) components from medicinal industrial set outs), and in hydro admixturelurgy (e.g. leaching of metal ions from ores). For mathematical poser of leaching an ideal solid liquid extraction is delimitate. The solvent added to the teetotal raw material is partially taken up by the solid material and the soluble ingredients are straight withdraw dissolved. Often all the solute is already dissolved (e.g. sugar in sugar beet). The solution is and then split into two parts. The foreign solution is called extract and the inside one raffinate (in the case of plant materials this is cell liquor). The simplifying assumptions are defined as follows: 1.

For batch extraction the chew symmetry of extract (B) and raffinate (A) does non motley during extraction (liquid ratio: f ? B A =constant). In a invariable system the mass immix rate ratio of extract and raffinate remains constant passim the equipment. 2. The densities of solutions remain very more than constant during extraction. 3. The solid intercellular substance has no absorptive properties. Hence, by and by infinite condemnation the concentrations in the extract and raffinate phases are the resembling. 4. The turn out of solid material available for mass transfer does not change with time. 5. The concentration of the raffinate (cell liquor) is initially the same throughout the solid matrix: x 0 (kg solute/ kg raffinate). 6. The solid...If you want to get a full essay, order it on our website: Orderessay

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