Problem 5.5 A nonstoichiometric mixture of a dicarboxylic acid and a glycol having 20 mol % excess of the latter and a carboxyl group concentration of 5.64 mol/kg, was polymerized to about 80% esterification of the carboxylic acid groups. The mixture was then further polymerized in the presence of a strong acid catalyst which yielded the following data of the concentration of carborylic acid groups in the mixture versus reaction time.

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12.111:-0 2 14 16 8UUIOLTO 12
Problem 5.5 A nonstoichiometric mixture of a dicarboxylic acid and a glycol
having 20 mol % excess of the latter and a carboxyl group concentration of
5.64 mol/kg, was polymerized to about 80% esterification of the carborylic acid
groups. The mixture was then further polymerized in the presence of a strong acid
catalyst which yielded the following data of the concentration of carboxylic acid
groups in the mixture versus reaction time.
Time (min)
(COOH] (mol/kg)
1.24
0.78
10
0.52
15
0.38
20
0.27
0.20
25
Determine the reaction rate constant for the catalyst polyesterification.
Transcribed Image Text:12.111:-0 2 14 16 8UUIOLTO 12 Problem 5.5 A nonstoichiometric mixture of a dicarboxylic acid and a glycol having 20 mol % excess of the latter and a carboxyl group concentration of 5.64 mol/kg, was polymerized to about 80% esterification of the carborylic acid groups. The mixture was then further polymerized in the presence of a strong acid catalyst which yielded the following data of the concentration of carboxylic acid groups in the mixture versus reaction time. Time (min) (COOH] (mol/kg) 1.24 0.78 10 0.52 15 0.38 20 0.27 0.20 25 Determine the reaction rate constant for the catalyst polyesterification.
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