Purification of hydrophobic solids
AssigneeBASF SE
InventorKarl Schmeidl
Life of this patent
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Abstract
Purification of hydrophobic solids by forming granules in the presence of water comprises treating the solids, if desired more than once, with one or more different two-phase systems comprising A) a phase which wets the solids and effects granule formation and which consists essentially of one or more water-immiscible or partially water-miscible organic liquids, and B) a phase which takes up the impurities and which consists essentially of B1) water, one or more water-miscible organic liquids and if desired an inorganic acid or an inorganic base, or B2) water and an inorganic acid in the heat and subsequently separating the resulting granules from the aqueous phase.
Claims10
A process for purifying hydrophobic solids of pigments of phthalocyanines, to form granules in the presence of water, which comprises treating the solids, if desired more than once, with one or more different two-phase systems comprising
- A) a phase which wets the solids and effects granule formation and which consists essentially of one or more water-immiscible or partially water-miscible organic liquids, and
- B) a phase which takes up the impurities and which consists essentially of
- B1) water, one or more water-miscible organic liquids and if desired an inorganic acid or an inorganic base, or
- B2) water and an inorganic acid by heating and subsequently separating the resulting granules from the aqueous phase.
Dependencies are inferred from the claim text.