Considering data from literature reviews, the concentration of
KOH was tested in a range of 0.5–1.5 wt% of WCO. Fig. 2 shows
the effect of concentration of KOH on the conversion at the methanol/WCO ratio of 8:1. Increasing KOH concentration from 0.5 wt%
to 0.75 wt% increased the conversion. It was 82% and 90% at
0.5 wt% KOH and 0.75 wt% KOH, respectively during 120 min.
However, the conversion reduced to 75% in the case of
1.5 wt% KOH. This could be explained by the fact that the forma