Elementary Principles 229 - 6.82(cont'd) Overall mass...

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6- 63 6.82(cont'd) Overall mass balance Overall MgSO balance 4 U V W ± , ± mm 14 Diss. tank overall mass balance Diss. tank MgSO balance 4 U V W ± , ± 26 () ( . . . ) . , ( . * . ) . MW MgSO MgSO 7H O 4 42 =+ + = = += 24 31 32 06 64 00 12037 12037 7 1801 24644 Overall MgSO 4 balance : 60,000 lb 0.90 lb MgSO 7H O 120.37 lb MgSO h lb 246.44 lb MgSO 7H O (300 lb / h)(0.32 lb MgSO / lb ) 4 2 m 4 4 2 4 m + ± (. / . ). ± (. ) 44 120 37 246 44 0 05 0 23 ⇒= ± . mx 4 4 5257 10 lb crystals / h m Overall mass balance : 60 000 6300 105 1494 51 0 1 4 4 , ± . ±± ± .257 / + = = m h lb m2 m lb H O / h c. Diss. tank overall mass balance: Diss. tank MgSO balance lb / h lb / h recycle 4 m m 60 000 6000 54 000 120 37 246 44 0 23 0 32 1512 10 9 575 10 162 62 2 5 6 4 , ±±± :, ( . / . ) . ± . ± ± . ± . ++=+ U V W = = mmm Recycle/fresh feed ratio == 9.575x10 lb / h 1494 lb / h 64 lb recycle / lb
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