Elementary Principles 82

# Elementary - 4.50 a Design for low conversion and feed ethane in excess Low conversion and excess ethane make the second reaction unlikely C2H6 Cl2

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4- 41 4.50 a. Design for low conversion and feed ethane in excess. Low conversion and excess ethane make the second reaction unlikely. b. C 2 H 6 + Cl 2 C 2 H 5 Cl + HCl, C 2 H 5 Cl + Cl 2 C 2 H 4 Cl 2 + HCl Basis : 100 mol C 2 H 5 Cl produced n 1 (mol C 2 H 6 ) 100 mol C 2 H 5 Cl 5 unknowns n 2 (mol Cl 2 ) n 3 (mol C 2 H 6 ) –3 atomic balances n 4 (mol HCl) 2 D.F. n 5 (mol C 2 H 5 Cl 2 ) c. Selectivity: 100 14 5 mol C H Cl (mol C H Cl 25 24 2 = n ) = n 5 7143 . m o l C H C l 15% conversion: C balance: 10 1 5 22 1 0 0 7 1 4 3 13 −= =+ + U V | W | . . bg b g nn = = n n 1 3 714 3 114 3 . . mol C H in mol C H out 26 H balance : 6 714 3 5 100 6 114 3 4 7143 4 .. . b g + + n ⇒= n 4 6071 . mol HCl Cl balance: 2 100 6071 2 7143 2 n + = n 2 114 3 . mol Cl 2 Feed Ratio : 114 3 016 66 ./ . / mol Cl 714.3 mol C H mol C H 2 2 = Maximum possible amount of C 2 H 5 Cl : n max == 114.3 mol Cl 1 mol C H Cl 1 mol Cl 114.3 mol C H Cl 5 2 Fractional yield of C 2 H 5 Cl : n n CHC l 100 114 3 0875 max . . mol mol d. Some of the C 2 H 4 Cl 2 is further chlorinated in an undesired side reaction: C 2 H 5 Cl 2 + Cl 2 C 2 H 4 Cl 3 + HCl 4.51 a. C 2 H 4 + H 2 O
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## This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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