抄録
Deresination effects of anionics, nonionics or anionic-nonionic surfactant mixtures was evaluated during the first alkali extraction in a conventional six-stage refining process of hardwood sulfate pulp. Polyoxyethylene nonylphenyl ether (n=9) showed the highest effect as in the refining of sulfite pulp. Polyoxyethylene lauryl ether (n=7) and some anionics, such as sodium dodecylbenzene sulfonate, sodium sperm alcohol sulfate or sodium salt of sulfated polyoxyethylene nonylphenyl ether (n=6), were fairly effective for the deresination.
When mixtures of anionic with nonionic surfactant are used, certain mixing effects could be obtained in place of synergistic effect observed in the refining of sulfite pulp.
