Quiz 4 - ChE 2114 Fourth Quiz September 28, 2007 1. (30...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ChE 2114 Fourth Quiz September 28, 2007 1. (30 points) An aqueous sugar solution which is 10.0 mass % sugar is fed to an evaporator which is in series with a second evaporator. The final product leaving the second evaporator is 20.0 mass % sugar. Equal amounts of water are evaporated in each of the two evaporators. What is the mass % sugar in the solution that flows from ElZIeEfirst evaporator to the second evaporator? 15 T HAG I I C; 0 WIS _ CJOUOG} 20.2019 ,- P:5c> " I +‘0‘i’a/‘L- FILO‘MJ—a—j/Ma:4é, : lOO *5? : l0 FXlOC;f3,3/mma,dfa_fio7o.¢u&— "L._ 7-5 2. (30 points) When ethane, C2H6, is combusted in a furnace with 15.0% excess air, there is 100% conversion of the fuel, but both C02 and C0 are formed. The selectivity is 9 to 1. Desired reaction: ($21-15 + W2 02 —+ 2 C0; + 3 H20 Undesired reaction: C2H6 + 5;? 02 —> 2 C0 + 3 H20 Calculate the mo] % 02 in the product gas leaving the fiJrnace? ago/Loaf. IOOWIUJ— CLHé‘L-C’J‘I'" \ .., Ci. Hg _—H—.._ L0; ZOOLO-qoj : [ 6/0 do 9.00 (a. r H10 300 o,L 402.5490— 375* 3:0:625 Ni, 151+ +Cawta Zc'TQS bl ‘ W gag N;— zone—.5 x100 :- 3.o[ 700,1. I, (40 points) Consider the production of ammonia by the reaction N2 + 3 H2 (9 2 NH3 in a system involving recycle and purge. The fresh feed to the process is 1.50 mol % inerts (Ar) and contains the N2 and H2 in stoichiornetric proportions. The ammonia product is removed from the coolen’condenser as pure NH3 and the recycle and purge contain no NHg. Given: the fresh feed rate is 100 molsfmin the mo] % Ar in the recycle is 8.00% (a) (20 points) What is the total molar flow rate for the purge stream? _ [Jib I 3-00 0A!- E‘ 'Q‘”‘” 690% H; r: LSOAF ileum; 73.97 H; lootooiso) : Etooe‘oo} l P 2:3.75% NHBMMK- (b) (20 points) What is the overall % conversion for the process? Nag ‘ t : 14.e3t2)— magma-50') L1) _. M- +O’&+ N x (or: :— 92.5"o WLvmm/WL. L(2_zfir_{53j _..——*:_. ...
View Full Document

This note was uploaded on 09/28/2008 for the course CHE 2114 taught by Professor Pldurrill during the Fall '08 term at Virginia Tech.

Page1 / 2

Quiz 4 - ChE 2114 Fourth Quiz September 28, 2007 1. (30...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online