초록 ▼

A new method of forming agglomerates of fine powdered solids comprises dispersing the powder in a chemically inert carrier liquid that also contains a dissolved binder precursor polymer with cyclic dicarboxylic acid anhydride groups on the polymer chain. The dispersion is shaped and then brought int

A new method of forming agglomerates of fine powdered solids comprises dispersing the powder in a chemically inert carrier liquid that also contains a dissolved binder precursor polymer with cyclic dicarboxylic acid anhydride groups on the polymer chain. The dispersion is shaped and then brought into contact with a second carrier liquid that contains polyamines. The polyamines react with the anhydride groups on the other polymer to form an insoluble binder polymer that hardens the shaped dispersion. The hardened shape can then be separated from the liquids and/or further reacted if desired to produce amide bonds in the final agglomerates. The method is useful for forming mechanically and thermally stable agglomerates of such materials as activated carbon, metals dispersed on catalyst carriers, etc.

대표청구항 ▼

A process for making a shaped agglomerate from finely divided solid particles, comprising the steps of: (a) mixing the solid particles with a first carrier liquid phase comprising a solution of binder precursor polymer molecules that contain anhydrides of dicarboxylic acids, said solid particles bei

A process for making a shaped agglomerate from finely divided solid particles, comprising the steps of: (a) mixing the solid particles with a first carrier liquid phase comprising a solution of binder precursor polymer molecules that contain anhydrides of dicarboxylic acids, said solid particles being less than fully soluble in and chemically non-reactive with said first carrier liquid phase; (b) shaping the dispersion formed in step (a) into the desired shape for the final agglomerate; and (c) reacting the shaped body formed in step (b) with an effective quantity of anhydride-reactive polyamine molecules to harden at least a surface zone of the shaped body formed in step (b) by converting the binder precursor polymer molecules in this zone to binder polymer molecules, said binder polymer, as a result of reaction between the anhydride and the polyamine, containing sufficient cyclic imide groups and being present in sufficient amount so that the shaped body as a whole detectably absorbs infrared light selectively at about 1770 and about 750 wave numbers.