A NEW MODIFIED PULPING PROCESS ALTERNATIVE TO SULFATE METHOD ALKALI-SULFITE-ANTRAQUINONE-ETHANOL (ASAE)

In this study, ASAM method was modified by the use of ethanol instead of methanol. This new organosolv pulping method is referred to as ASAE . Brutia pine (Pinus brutia Ten.) was chosen as raw material in cookin g because of its wide-spread usage in Turkish sulphate mills. 28 cooks were made by changing the cooking conditions systematically to achiev e the most effective cooking parameters for yield and physical propert ies of ASAE pulps. Also, a control sulphate cook was made. After stati stical evaluations of the data optimum pulping conditions were determi ned to be 20% Na2SO3 with 50% ethanol ratios and 150 min cooking time at maximal temperature. It was found that ASAE pulps had higher yield, viscosity, brightness and strength properties than sulphate control p ulps with the exception of breaking length. Furthermore bad-odour prob lems were absent during the blowing and washing process in the laborat ory trials.