The reusability of the prepared ICG(15)-SO3H catalystwas carried
out at the 75 C reaction temperature, 10:1 methanol-to-PFAD
molar ratio, 2.5 wt.% of the catalyst and 2 h reaction time. The
catalyst was recovered, separated from the product, washed and
dried before it was reused for the next reaction cycle under the
same operating conditions