Discussion
A distillery is choosing between molasses and rice straw as a feedstock for fuel ethanol.
Which consideration most favours molasses?
Answer: B
Correct answer: Its sugars need no pretreatment
Molasses arrives with its sugars already in fermentable form, so the process needs only dilution and nutrient adjustment before the yeast goes to work. Rice straw is lignocellulose: the cellulose must first be freed from the lignin by a severe pretreatment and then hydrolysed enzymatically before any fermentation can begin.
Those two extra stages carry most of the cost of the lignocellulosic route. Straw is in fact available across a far wider area than molasses, and calorific value and silica are irrelevant to a fermentation.
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