Several additives have been used in research and on an
industrial scale to improve the pulp yield and to increase
the rate of delignification. One such additive is 1,4-
dihydro- 9,10-dihydroxyanthracene (DDA), also called soluble
anthraquinone. This chemical is widely used in Japan and
some other countries, especially with the...
Douglas-fir wood chips from Oregon were pulped with kraft
green liquor to produce semi-chemical pulps with properties suitable
for the manufacture of corrugating medium. The effects of five cooking
variables were studied, chemical charge, chip size, bark content
of chips, pulping temperature, and liquor sulfidity. The combinations
of levels of...