| 摘要 |
<p>A process for deinking a printed wastepaper pulp slurry comprising: (a) adding to a printed wastepaper pulp slurry a deinking composition consisting essentially of a nonionic ethoxylated and propoxylated surfactant of the formula (I): R-O-(OCH2CH2)n-(OCH2CHCH3)m-(OCH2CH2)q-O-X, wherein n is a number from about 1 to about 50, m is a number from about 1 to about 50, q is a number from about 1 to about 50, and R and X are H or an alkyl, alkenyl, or aryl group containing from about 3 to about 35 carbon atoms; (b) washing the slurry in order to obtain a deinked paper pulp suspension and an ink suspension; and (c) separating the deinked paper pulp suspension from the ink suspension.</p> |
