A clarified broth from the fermentation of sucrose using Aspergillus niger consists of 16.94% wt citric...

A clarified broth from the fermentation of sucrose using Aspergillus niger consists of 16.94% wt citric acid, 82.69% wt water, and 0.37% wt other solutes. To recover citric acid, the broth would normally be treated first with calcium hydroxide to neutralize the acid and precipitate it as calcium citrate, and then with sulfuric acid to convert calcium citrate back to citric acid. To avoid the need for calcium hydroxide and sulfuric acid, U.S. Patent 4, 25, 671 describes a solvent-extraction process using, which is insoluble in water and has a density of 0.847 g/cm^3. In a typical experiment at 30 C, 50 g of 20% wt citric acid and water was contacted with 0.86 g of amide. The resulting organic phase assumed to be in equilibrium with the aqueous phase, contained 6.39% wt citric acid and 2.97% wt water.

Determine (a) the partition (distribution) coefficients for citric acid and water, and (b) the solvent flow rate in, needed to extract 98% of the citric acid in 1300 kg/ h of broth using 5 countercurrent, equilibrium stages, with the partition coefficients from part (a), but ignoring the solubility of water in the organic phase. In addition, (c) propose a series of subsequent stages to produce near-pure citric acid crystals. In part (b), how serious would it be to ignore the solubility of water in the organic phase? 5.10. Extraction

Expert Solution

Amanda K answered 6 months ago

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