a b s t r a c t
Projected decline in future wood resources has prompted researchers to try various additives in existing
pulping processes for fiber yield improvement. Many studies have been conducted in the past aimed at
improving kraft pulp yield with the use of additives in the cooking liquor. In this study, the effects of
anthraquinone (AQ) and 2-methylanthraquinone (MAQ) on the pulp yield of kadam (Anthocephalus chinensis)
were investigated. Three different active alkali doses (14%, 16% and 19% as NaOH) along with 0.1%
of AQ or MAQ on chips were used to obtain various levels of delignification of the hardwood. Addition of
AQ or MAQ to kraft pulping, increased fiber yield (0.5–2.7% on chips) and improved delignification selectivity
(lignin vs. carbohydrate removal). Increases in pulp yield due to AQ or MAQ were more significant
at lower doses of active alkalis. The viscosities and the physical strength properties of the pulps with
kappa numbers 16–19 were comparable to kraft although there was a minor decrease in tensile strength
for the kraft/MAQ pulp.