Method B was chosen over Method A, due to the time saving; however, the
acidity of the pyrolytic lignin from method B was still higher than that from method A.
In this part of the study, the amount of water used in Method B was investigated, with
the hope that more water can remove more polar compounds including acids. Water:biooil
ratios of 5:1, 10:1, 15:1 and 20:1 by volume were studied. The amount of water was
fixed, while the bio-oil was varied in order to limit the total volume of liquid in the
extraction system, which used a constant stirring speed.