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US 10,865,114 B2Granted
Process for preparing precipitated silica comprising a high compaction step
AssigneeRhodia Operations
InventorsSylvaine Neveu, Anne-Laure Pinault
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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, followed by a step of separation to obtain a cake and a step of drying said cake, wherein a step of compaction of said cake at a pressure greater than 10 bars is carried out between the step of separation and the step of drying.
Claims11
A process for preparing precipitated silica, the process comprising;
- reacting a silicate with an acidifying agent to obtain a precipitated silica suspension,
- separating a precipitated silica from the suspension by a single separating step to obtain a cake, wherein the separating step consists of filtration, optional washing, and compacting on a filter press, and
- drying the said cake,
- wherein compacting said cake is carried out at a pressure between 10 and 45 bars and
- wherein, after compacting and before drying, said cake has a dry matter level between 29 and 35 wt %.
2 more elements
Dependencies are inferred from the claim text.