Answer / engineer muhammad amin baloch

Generally it is very difficult to differentiate both but
difference is at the end product.
Crystalline produce ordered solids while precipitation gives
amorphous solids
it is easier to carried out the precipitation than
crystalliztion

Answer / mangla

Basically the difference between crystallization and precipitation is the end product. Both are phase changes in which a solid is formed; however, crystalization produces crystalline solids while precipitation produces amorphous solids. Crystalline solids are more highly ordered than amorphous solids, and so it is generally harder to produce crystals than precipitates (this is especially true for biologists like me who try to crystalize proteins). In general, if you let the phase change occur more slowly (i.e. supersaturate a solution then let it cool) you will form crystals wheras if you let the phase change occur rapidly (i.e. mix two solutions and a solid forms immediately), you will form a precipitate

UNIT OPERATION - EXAMPLE 9.2 : A distillation column separates 10000 kg / hr of a mixture containing equal mass of benzene and toluene. The product D recovered from the condenser at the top of the column contains 95 % benzene, and the bottom W from the column contains 96 % toluene. The vapor V entering the condenser from the top of the column is 8000 kg / hr. A portion of the product from the condenser is returned to the column as reflux R, and the rest is withdrawn as the final product D. Assume that V, R, and D are identical in composition since V is condensed completely. Find the ratio of the amount refluxed R to the product withdrawn D. Hint : Solve the simultaneous equations as follow in order to find the answer (R / D) : 10000 = D + W; 10000 (0.5) = D (0.95) + W (0.04); 8000 = R + D.

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