EFFECT OF TIME, TEMPERAYURE AND ALKALI TO SULFATE COOKS OF EUCALYPTUS CAMALDULENSIS

Abstract

The relationship of time, temperature and amount of alkali to sulfate cooking of Eucalyptus camaldulensis wood was studied by the following method. Sample woods were taken from six and a half years old E. camaldulensis plantation from Prachin Buri. The trees were grown at 2 x 8 m. They were debarked and machined into chip of the size between 3 t0 19 mm. About 350 g of dry chip per each cook was made. The total number of cooks were 60 times at the following conditions: cooking time from 0 to 2 hours at temperature of 160 - 180ºC and effective alkali of 14.0 to 17.5 %. The results were summarized as follows. The average of H-factor, pulping yield and Kappa number were 626 - 1128, 45 - 51% and 36 - 51, respectively. The number is identical to 3.5 - 5.7% calculated lignin in pulp. The yield and number depended on the factor and effective alkali. The regression equation among Kappa number (K), effective alkali (EA) and H-factor (H) was calculated. The square of correlation coefficient of the equation was 0.913. The equation was
                                      K = 289.4 - 28.70 (EA)^0.0903 ln H
          The liner regression equation between lignin (L) and Kappa number (K) was calculated. The square of correlation coefficient of the equation was
                                      L = -2.214 + 0.1563K.