Kinetic Studies on Saponification of Poly(ethylene terephthalate) Waste Powder Using Conductivity Measurements

Table 4

Thermodynamic parameters of saponification.

Temp; /K	1//10^−3 K^−1	/10^−3 g^−1s^−1
323	3.10	0.88	−3.05	−9.44
333	3.00	1.68	−2.77	−8.32
343	2.92	2.88	−2.54	−7.41
353	2.83	5.12	−2.29	−6.49

Slope of the graph of verses = −10925.92.
Intercept of verses = −4.90.
∴ Activation enthalpy: = −90.8 KJg⁻¹.
Activation energy: = 126.5 JK⁻¹g⁻¹.
Free energy of activation: = 49.9 KJg⁻¹.