The FFA conversion increased with increasing the methanol to oil
ratio (Table 3, entries 4–8). However, when the ratio exceeded to 4, increasing in conversion was marginal. Therefore, 4:1 of methanol to oil
ratio was found to be the optimum value (Table 3, entry 7).
Water is a product of the reversible esterification reaction, so its
presence in the feed is expected to reduce the conversion at equilibrium. To investigate the effect of the water content on the catalytic
activity, the initial water content was varied with 2, 4, 6, 8, and
10 wt.% of water to oil (Table 3, entries 9–13). The [QPS]PW gave
over 67.7% conversion at 10 wt.% water content. Below 6 wt.% the
catalytic activity was fairly stable. Therefore, the [QPS]PW is a relatively water-tolerant catalyst.
The FFA conversion increased with increasing the methanol to oilratio (Table 3, entries 4–8). However, when the ratio exceeded to 4, increasing in conversion was marginal. Therefore, 4:1 of methanol to oilratio was found to be the optimum value (Table 3, entry 7).Water is a product of the reversible esterification reaction, so itspresence in the feed is expected to reduce the conversion at equilibrium. To investigate the effect of the water content on the catalyticactivity, the initial water content was varied with 2, 4, 6, 8, and10 wt.% of water to oil (Table 3, entries 9–13). The [QPS]PW gaveover 67.7% conversion at 10 wt.% water content. Below 6 wt.% thecatalytic activity was fairly stable. Therefore, the [QPS]PW is a relatively water-tolerant catalyst.
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