Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Question

You are asked to manufacture 10 kg of polyester with a number-
average molecular weight of 1000 by polymerizing butane-1,4-diol
(HO(CH2)4OH) with adipic acid (HOOC-(CH2)4-COOH).
a) What weight of diol and diacid do you need, respectively? To what
extent, p, should the reaction be carried out to? Assume a stoichiometric
balance.
b) What are the number and weight fractions of dimer, trimer and tetramer
at this point in the reaction?
c) Because of the polymerization by dehydration to olefin, 3 mol% of the
diol will be lost. What would be the number-average molecular weight
when the reaction is carried out to the same extent? How could you offset
this loss so that the desired molecular weight 

 

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