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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 A portion of the product from the condenser is returned to the column as reflux R, and the rest is withdrawn as the final product D. Assume that V, R, and D are identical in composition since V is condensed completely. Find the ratio of the amount refluxed R to the product withdrawn D. Hint : Solve the simultaneous equations as follow in order to find the answer (R / D) : 10000 = D + W; 10000 (0.5) = D (0.95) + W (0.04); 8000 = R + D.
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Answer Posted / kangchuentat
UNIT OPERATION - ANSWER 9.2 : Overall Process - Total Balance : 10000 = D + W. Benzene Balance : 10000(0.50) = D (0.95) + W (0.04). Solving simultaneously, D = 5050 kg / hr; W = 4950 kg / hr. Total balance around the separator : 8000 = R + D; R = 2950 kg / hr. Answer : Ratio R / D = (2950 / 5050) = 0.58. The answer is given by Kang Chuen Tat; PO Box 6263, Dandenong, Victoria VIC 3175, Australia; SMS +61405421706; chuentat@hotmail.com; http://kangchuentat.wordpress.com.
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