Elementary Principles 326 - 8.67 (cont'd) (b) Cooling...

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8- 47 8.67 (cont’d) (b) Cooling water: T out C 40 , T 2 34 = ° C, T 1 25 = ° C () ( ) ( ) ( ) * * 40 C 0.109 11,877 0.752 3961 0.139 2831 4667 mm Hg 1 0 45.7 C ii i TE i ff i if Px p y fT P T pT + = + + = =− = ⇒ = ° Refs: CH 38 l bg , C H 41 0 l @ 40 ° C, H O 2 l @ 25 ° C. Δ ± . ± . ± . Hm m =⇒ × =⇒ = × 03 7 7 2 1 7 1 00 5 7 4 1 0 1 8 1 6 kg H O / h 2 (c) Cost of refrigerant pumping and recompression, cost of cooling water pumping, cost of maintaining system at the higher pressure of part (b). 8.68 Basis: 100 mol leaving conversion reactor (mol H O( )) 0.37 g HCHO/g ( mol/min) conversion n 3 (mol O ) 2 n 3 (mol N ) 2 3.76 n 4 (mol H O( )) 2 v reactor 100 mol, 600°C, 1 atm 0.199 mol HCHO/mol 0.0834 mol CH OH/mol 3 0.303 mol N /mol 2 0.0083 mol O /mol 2 0.050 mol H /mol 2 0.356 mol H O( )/mol 2 v n 1 (mol CH OH( )) 3 ln 2 (mol CH OH( )) 3 l n 8 (mol CH OH( )) 3 l H O( ) 3.1 bars, sat'd 2 v m w1 (kg H O( )) 2 l 3.1 bars, sat'd H O( ) 45°C 2 l m w2 (kg H O( )) 2 l 30°C Q (kJ) n 8 (mol CH OH) 3 2.5 distillation sat'd, 1 atm CH OH( ), 1 atm, sat'd 3 l Product solution n 7
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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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