1983 Volume 37 Issue 6 Pages 537-547
Studies were carried out on the prepared of a new chemical pulp (PAP) and semichemical pulp (PASCP) from bagasse without depithing by hydrogen peroxide-alkali (PA) process.
The cooking liquor was a mixture of water, hydrogen peroxide 15%, sodium hydroxide 1020%, on raw materials and small quantities auxilialies, (chelating agents : EDTA or DTPA0.3%, and anthraquinone AQ 0.010.05% on raw materials) the liquor ratio of mixture to bagasse being 10 l/kg. PAP (total yield of 46.554.2%, rejects 1.08.8% and the screened 38.648.4%) was easily obtained from bagasse without depithing after cooking for 11.5 hours at about 150°C.
Increasing alkali in PA cooking liquor resulted in increasing the screened and decreasing rejects. Increasing hydrogen peroxide in PA cooking liquor resulted decreasing rejects and Kappa no. of the screened. Increasing of AQ in PA cooking liquor resulted incresing in the screened and decreasing rejects.
The analysis of unbleached PAP gave kappa no. 5.011.5, Klason lignin about 1%, pentosan 2126% and whiteness 4048 Hunter. Unbleached PAP C-402 (total yield 48.0%, rejects3.1%, the screened 44.9%, kappa no. 7.5) has breaking length 4.5 km at 336 ml C. S. F.
Bleached PAP C-104 (at 175 ml C. S. F.) has breaking length 6.7 km, burst factor 3.9, tear factor 49, folding endurance 290.
