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US 10,246,338 B2Granted
Process for preparing precipitated silica using a mixer or extruder
AssigneeRhodia Operations
InventorsSylvaine Neveu, Anne-Laure Pinault, Philippe Jost
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Abstract
A process for preparing precipitated silica comprising a reaction of a silicate with an acidifying agent to obtain a suspension of precipitated silica (S1), followed by a separation step to obtain a cake, a disintegration step of said cake to obtain a suspension of precipitated silica (S2), and a drying step of this suspension, wherein the disintegration step is performed by mixing using a twin-screw mixer or by extrusion.
Claims19
A process for preparing a precipitated silica, the process comprising:
- reacting a silicate with an acidifying agent to obtain a suspension of precipitated silica (S1), followed by separation to obtain a cake having a dry matter content of at least 25% by weight,
- compacting the cake at a pressure higher than 10 bars and lower than 60 bars;
- disintegrating the cake to obtain a suspension of precipitated silica (S2) by mixing in a twin-screw mixer or by extrusion, and
- drying the suspension of precipitated silica (S2).
1 more element
Dependencies are inferred from the claim text.