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US 2026/0103386 A1Published application
Batch Process For Silica Generation
OwnerZhi Chen, Shawnee Marie Wilson +1inventors
InventorsZhi Chen, Shawnee Marie Wilson, Qianhe Wang
Life of this patent
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Abstract
An improved batch process for making silica onsite is provided. Optionally, a pH buffer system is used for accurate pH control and as a method to offset the variation of caustic and acid concentration in the raw materials. The turbidity measurement is used as an indication for reaction termination.
Claims20
A batch process for preparing silica, said process comprising:
- a) mixing a silicate salt in the range of about 26% to about 29%, an acid, and a capacity buffer, and water in a vessel to obtain a mixture, wherein said mixture has a starting pH in the range of about 8.5 to about 10;
- b) aging said mixture for a period of time sufficient to obtain a turbidity in the range of about 10 NTU to about 50 NTU;
- to obtain unmodified silica, wherein said silica have a S-value of about 2 to about 10 or about 4 to about 10, and
- c) diluting said mixture with water to obtain silica with a concentration of about 0.1 wt. % to about 3 wt. %.
1 more element
A silica, wherein said silica is prepared by a process comprising:
- a) mixing a silicate salt in the range of about 26% to about 29%, an acid, and a capacity buffer, and water in a vessel to obtain a mixture, wherein said mixture has a starting pH in the range of about 8.5 to about 10;
- b) aging said mixture for a period of time sufficient to obtain a turbidity in the range of about 10 NTU to about 50 NTU;
- to obtain unmodified silica, wherein said silica have a S-value of about 2 to about 10 or about 4 to about 10, and
- c) diluting said mixture with water to obtain silica with a concentration of about 0.1 wt. % to about 3 wt. %.
1 more element
Dependencies are inferred from the claim text.