| 摘要 |
Liquid extraction agents for ions comprising one or more components with ion exchange properties selected from the group natural or synthetic ethereal oils, preferably turpentine oils, and distillation and/or hydrogenation and/or rearrangement products of these, optionally in combination with one or more organic solvents and optionally also comprising organophilic chelating agents and/or hydrophilic chelating agents and/or organophilic ion active compounds. The extraction agent preferably is essentially water insoluble or has a restricted solubility in water and is useful for extraction of ions from both solid and liquid phase, especially metal ions from lignocellulose, preferably with simultaneous metal ion extraction and/or anion extraction and delignification and bleaching of lignocellulose. A special application is to remove from lignocellulose incrust forming and bleaching retardant metal ions with simultaneous delignification in closed system under EFM (Effluent Free Mill) conditions. |
