EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
4th Edition
ISBN: 9781119192107
Author: BULLARD
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Textbook Question
Chapter 4, Problem 4.68P
Ethane is chlorinated in a continuous reactor:
C2H6 + Cl2 - C2H5C1 + HC1
Some of the product monochloroethane is further chlorinated in an undesired side reaction:
C2H5C1 + Cl2 - C2H4C12 + HC1
- Suppose your principal objective is to maximize the selectiv ity of monochloroethane production relative to dichloroethane production. Would you design the reactor for a high or low conversion of ethane? Explain your answer. (Hint: If the reactor contents remained in the reactor long enough for most of the ethane in the feed to be consumed, what would the main product constituent probably be?) What additional processing steps would almost certainly be carried out to make the process economically sound?
- Take a basis of I (X) mol CSH5CI produced. Assume that the feed contains only ethane and chlorine and that all of the chlorine is consumed, and carry out a degree-of-freedom analysis based on atomic species balances.
- The reactor is designed to yield a 15% conversion of ethane and a selectivity of 14 mol CSHsCl/moi C2H4CI2, with a negligible amount of chlorine in the product gas. Calculate the feed ratio (mol CI2/ mol C2H*) and the fractional yield of monochloroethane.
- Suppose the reactor is built and started up and the conversion is only 14%. Chromatographic analysis shows that there is no CI2 in the product but another species with a molecular weight higher than that of dichloroethane is present. Offer a likely explanation for these results.
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2. Ethanol is produced by the hydration of ethylene according to the first reaction below.
However, some of the products are converted to diethyl ether according to the second
reaction.
C2H4 + H20 – C,H;0H
2C2H;OH - (C,H5)20 + H20
The feed to the reactor contains ethylene, steam, and N2 An effluent analysis is given in
the following table:
C2H4
Component
%mol
H2O
45.08
With a basis of 100 kmol of effluent, determine the following:
CH;OH
2.95
(C2H5)20
0.27
N2
39.12
12.58
Determine the fractional yield of ethanol.
Ethanol reacts with chlorine in a continuous reactor according to the equationC2H6 + Cl2 → C2H5Cl + HClA portion of the monochloroethane reacts with chlorine in an undesired side reaction according to the equationC2H5Cl + Cl2 → C2H4Cl2 + HClThe conversion of ethane is 13%, the selectivity of monochloroethane relative to dichloroethane is 13.3 and all the chlorine is consumed. Calculate the moles of each species in the outflow per 100 moles of monochloroethane produced.
For the decomposition rate constant of methyl acetoxypropionate (=A)
CH3COOCH(CH3)COOCH3(g) → CH3COOH(g) + CH2=CHCOOCH3(g)
a value 0.0317 s-1 was found at 610 K. The decomposition is carried out at this
temperature in a closed vessel having a volume of 20 dm³. This reactor initially
contained 0.4 moles of pure acetoxypropionate. Assuming ideal gas phase
behaviour, calculate: a) what will be the composition of the reaction mixture
(in mole%) after 90 s from the start of the reaction, b) reactor pressure at this
time.
Chapter 4 Solutions
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
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