| 摘要 |
This invention relates to a process for the deinking of office wastepaper stocks which comprises: a) converting the wastepaper to a pulp, b) contacting the pulp with an aqueous medium of alkaline pH containing between 0.05 and 2 percent by weight, calculated on a dry weight basis of the pulp, of a deinking agent comprising one or more alcohol ethoxycarboxylate surfactants of formula (I): R-O-(CH2-CH2O)n-X, wherein R is a straight-chain or branched-chain alkyl group having in the range of from 8 to 20 carbon atoms, n represents the average number of oxyethylene groups per molecule and is a number in the range of from 3 to 20, and X represents a carboxylate group, and c) treating the resulting pulp-containing medium by washing or flotation to remove suspended ink therefrom. |
