From: A novel Brönsted–Lewis acidic heteropoly organic–inorganic salt: preparation and catalysis for rosin dimerization
Catalyst recycle times
Softening point (°C)
Acid value (mg/g)
0
120.1
111.8
1
114.3
125.8
2
115.0
120.3
3
126.1
124.5
4
120.4
93.7
5
96.0