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    • 6. 发明授权
    • Process for preparing highly concentrated aqueous press cakes of solids
    • 制备高浓缩水性固体的压饼的方法
    • US4828622A
    • 1989-05-09
    • US191808
    • 1988-05-05
    • Joachim WeideErwin DietzReinhold Deubel
    • Joachim WeideErwin DietzReinhold Deubel
    • C09B67/38B01D37/03B01J13/00C09B67/02C09B67/42C09B67/54
    • B01D37/03C09B67/0096
    • According to the invention, addition of one or more surfactants having a cloud point in aqueous solution to an aqueous suspension of a solid gives after the isolation of the solid at a temperature above the cloud point aqueous press cakes containing a large amount of this solid. The direct processing of press cakes as obtained for example after the synthesis and isolation of dyes or pigments to give practical aqueous pastes or dispersions requires a minimum solids content in the press cakes. The minimum content is frequently not obtained when conventional methods of isolation are used, so that it is necessary to proceed via the indirect route of drying to obtain the powders and redispersing the powders. By using the process according to the invention it is possible to cut out the costly indirect route or, if desired, to reduce the expense of drying to obtain powders by an appreciable margin.
    • 根据本发明,将一种或多种在水溶液中具有浊点的表面活性剂加入到固体的水悬浮液中,在高于含有大量该固体的浊点水性压饼的温度下分离固体后,得到固体。 在合成和分离染料或颜料之后获得的压榨蛋糕的直接加工以产生实用的水性糊剂或分散体,需要在压榨蛋糕中具有最小的固体含量。 当使用常规的隔离方法时,通常不能获得最小含量,因此需要通过间接的干燥途径进行获得粉末并再分散粉末。 通过使用根据本发明的方法,可以切出昂贵的间接途径,或者如果需要,可以减少干燥所需的费用,以获得明显的余量。