| 摘要 |
<p>The agent to be used for de-inking waste paper in the form of, for instance, old newspapers, pictorials, and the like, is an aqueous fatty acid-containing anionic dispersion which essentially contains saturated fatty acids, anionic surfactants as well as mono- and/or diesters of polyvalent alcohols of fatty acids having an HLB value of from about 3 to about 7. A preferred fatty acid is palmitic acid. A particularly suitable ester is commercial glycerin monostearate having a monoester content of 45-60 %. Use of the agent in de-inking results in a considerable improvement of the degree of whiteness of the remaining fibres and a reduction in the fibre losses during flotation. The agent may with advantage be used in continuous operation at a high recirculation rate of the process water.</p> |
