Solid Liquid Extraction

8.7. stiff politic origin 8.7.1. Theoretical background inviolable liquidity lineage (or leaching) is the sepa balancen of a potent solute from a embellish of solids by dissolving it in a liquid phase. Basically, in that location are three components in leaching: solid solute, non-water-soluble solids and resultant role. In most fonts, the diffusion of intra-particle soluble component(s) controls the communication channel rate. whence the process is often called as diffusion line of descent. Solid liquid raiseion is widely used in pabulum (e.g. extraction of loot from shekels cane or sugar beet; isolation of ve possessable oils from different seeds) and pharmaceutical industries (e.g. extraction of alive(p) components from medicative industrial plants), and in hydrometallurgy (e.g. leaching of metal ions from ores). For mathematical model of leaching an ideal solid liquid extraction is defined. The solution added to the dry raw material is partly take n up by the solid material and the soluble ingredients are unfeigned off dissolved. Often all the solute is already dissolved (e.g. sugar in sugar beet). The solution is then split into both parts. The outside solution is called extract and the internal one raffinate (in the case of plant materials this is cell liquor). The simplifying assumptions are defined as follows: 1.

For locoweed extraction the mass dimension of extract (B) and raffinate (A) does non change during extraction (liquid ratio: f ? B A =constant). In a continuous system the mass flow rate ratio of extract and raffinate remains constant throughout the equipment. 2. The densities of solutions rem! ain very(prenominal) much constant during extraction. 3. The solid matrix has no assimilative properties. Hence, by and by infinite time the concentrations in the extract and raffinate phases are the same. 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 ab initio the same throughout the solid matrix: x 0 (kg solute/ kg raffinate). 6. The solid...If you want to get a full essay, monastic order it on our website: OrderCustomPaper.com

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