ORGANOSOLV PULPING .3. ETHANOL PULPING OF WHEAT-STRAW

Organosolv pulping of wheat straw has been studied using aqueous ethan ol and alkali ethanol processes. Optimum results for the aqueous ethan ol process were obtained by using 1:1 aqueous ethanol (v/v) and 7:1 li quor ratio at 175 degrees for 2 hours. The pulp yield was 56% and chlo rine number 15. In this process, more than one half of the residual li gnin of the pulp could be diminished by a proper washing procedure. Be st results obtained in the alkaline ethanol process gave a pulp yield of 56.5% and chlorine number 3 by using 0.3 mol/L sodium hydroxide, 0. 05% anthraquinone, liquor ratio 7:1 and ethanol concentration 50% at 1 50 degrees for 90 minutes.