Kinetic Studies on Saponification of Poly(ethylene
terephthalate) Waste Powder Using Conductivity Measurements
Table 2
Reaction rate constant of saponification of PET waste powder.
Amount of PET waste powder: 10.0 g Amount of sodium hydroxide: 7.0 g Volume of pyridine: 3.0 cm3 Temperature: 70.0°C Specific conductance of conductivity water (): 1.45 µs/cm Specific conductivity of solution, : 668.1 µs/cm Specific conductivity at infinity, : 180.3 µs/cm
Time /min
Specific conductance of reaction mixture µs/cm
Specific conductance of reaction mixture (corrected) µs/cm
00
= 668.1
= 666.6
—
—
—
25
= 631.9
= 630.5
36.1
450.2
0.08
50
= 604.1
= 602.6
64.0
422.3
0.15
75
= 580.8
= 579.4
87.2
399.1
0.22
100
= 556.8
= 555.4
111.2
375.1
0.30
125
= 536.7
= 535.3
131.3
355.0
0.37
150
= 519.8
= 518.4
148.2
338.1
0.44
Slope of the graph of versus time = reaction rate constant, = 2.88 × 10−3 g−1s−1.
