25oil sup dpine sawdust 41 sup e 27 2 6 3 26douglas fir bark 0 12 1 15 phenols neutrals solids 2 9 47 8 15 6douglas fir bark 0 nd 19 phenols neutrals solids 4 8 50 8 17______________________________________ sup a phenolics 16 5 neutrals 9 5 sup b phenolics 16 5 neutrals 6 0 sup c water solubles by difference sup d from two condensers sup e etoac insolubles by difference not determined as indicated in table ii the aqueous alkali metal bicarbonate solution utilized to extract strong organic acids and highly polar compounds further purifies the phenol neutral fractions while any suitable alkali metal bicarbonate solution may be utilized the preferred solution is selected from sodium bicarbonate potassium bicarbonate lithium bicarbonate and ammonium bicarbonate with sodium bicarbonate being the preferred and most optimal solution from the aqueous bicarbonate solution it is possible to isolate a fraction rich in organic acids as a by product in this instance the aqueous layer can be neutralized for example with 50 by weight of phosphoric acid although other acids can be used saturated with sodium chloride and extracted with ethyl acetate it is possible to then evaporate the solvents and isolate the remaining fractions as well the phenols neutrals fraction can be further fractionated into isolated phenolics and neutrals if desired this can be accomplished by utilizing a 5 by weight solution of sodium hydroxide in a volume ratio of 5 1 of solution extract the aqueous layer is then acidified to a ph of about 2 utilizing a 50 solution of phosphoric acid although other acids can.