Liquid-Liquid Extraction??

Question

Can someone PLLLZZ explain to me what a tie line represents graphically in single stage liquid-liquid extraction processes????????

Answer 1

Problems can be varied by changing the given information. You then will need to think through the relationships (solvent/feed ratio, equilibrium tie-lines, operating lines, etc.) and adapt the procedure.

Minimum solvent-to-feed is determined by extending the tie-line that runs through the feed point until it intersects the segment connecting Vb and Lb. This intersection is the point Pmin, an operating point at minimum S/F. The line is then extended back across the envelope to the extract side. The intersection is the point Vmin, corresponding to the extract product at minimum S/F. (Remember that a "pinch" on this type of diagram means that the operating and equilibrium (tie-lines) overlap.) A mixing point "Mmin" can be determined using the feed point, Vb, Lb, and Vmin, and the lever-arm rule will provide a value for the S/F ratio.

Maximum solvent-to-feed is found by locating a point "Mmax" on the line connecting the fresh solvent and the feed, at the point where it intersects the extract side of the envelope. S/F is then calculated by lever arm.

Note on Tie Lines
Rarely do you have all the equilibrium tie lines you want. It is thus good to know that there is a fairly easy way of generating additional lines.


See this web site:
http://www.cbu.edu/~rprice/lectures/extract.html

Answer 2

each liquid has a various density and specific gravity,and the common assets that they have diverse melting and boiling factors. So in fractional distillation,the liquid with decrease boiling factors evaporates first and is gathered in a flask after being cooled and condensed,forsaking all different beverages with diverse homes.

Answer 3

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