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US 11,027,981 B2Granted
Process for the preparation of silicate and its use for the preparation of precipitated silica
AssigneeRhodia Operations
InventorsPhilippe Jost, Leo Ricardo Bedore Dos Santos, Daniella De Villefort Grossi
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Abstract
The invention relates to a novel process for the preparation of silicate comprising: reacting rice husk ash with a silicate precursor P1 to obtain a silicate S2 having a SiO2/MxO molar ratio MR2, in which the precursor P1 is either a silicate S1 having a SiO2/MxO molar ratio MR1 such that MR2>MR1, or a mixture of sand with metal hydroxide.
Claims15
A process for the preparation of a silicate S2, the process comprising:
- reacting rice husk ash with at least one silicate precursor P1 to obtain a silicate S2 having a SiO2/MxO molar ratio MR2, wherein the at least one silicate precursor P1 is either:
- a silicate S1 having a SiO2/MxO molar ratio MR1, such that MR2>MR1;
- or a mixture of sand with at least one metal hydroxide;
- wherein M is a metal selected from the group consisting of alkaline metals and x is 2;
- wherein, when silicate precursor P1 is the silicate S1, the method further comprises preparing the silicate S1 by direct attack of said with an alkali hydroxide.
2 more elements
A process for the preparation of precipitated silica, the process comprising:
- reacting rice husk ash with at least one silicate precursor P1 to obtain a silicate S2 having a SiO2/MxO molar ratio MR2, wherein the at least one silicate precursor P1 is:
- either a silicate S1 having a SiO2/MxO molar ratio MR1, such that MR2>MR1;
- or a mixture of sand with at least one metal hydroxide, wherein M is a metal selected from the group consisting of alkaline metals and x is 2, wherein, when silicate precursor P1 is the silicate S1, the method further comprises preparing the silicate S1 by direct attack of sand with an alkali hydroxide
- reacting silicate S2 with at least one acidifying agent in an aqueous liquid medium to obtain a suspension of precipitated silica,
- separating the precipitated silica from the aqueous liquid medium to provide wet precipitated silica, and
- drying said wet precipitated silica to obtain precipitated silica.
3 more elements
Dependencies are inferred from the claim text.