Process for producing porous spherical silica gel particles
AssigneeW.R. Grace & Co.-Conn.
InventorsLinping Xu, Dave Chapman, Li Zhang, Michael Baptiste, Jr., Jamin L. Krinsky, John H. Hain, Jr.
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Abstract
A process for forming a porous spherical silica material is provided. The process comprises mixing an alkali silicate with a mineral acid at pH and temperature sufficient to form a silica sol, mixing the silica sol with an oil and a surfactant to form a water-in-oil type emulsion, adding an alkaline solution to the emulsion to form a gel, adding a demulsifying agent and heating to a temperature of from about 60°° C. to about 90° C., and filtering, washing, optionally aging, and drying to obtain the porous spherical silica gel particles.
Claims26
A process for forming a porous spherical silica, the process comprising:
- a. mixing an alkali silicate with a mineral acid at pH and a temperature sufficient to form a silica sol,
- b. mixing the silica sol with an oil and a surfactant to form an emulsion,
- c. adding an alkaline solution to the emulsion at a time and temperature sufficient to form a gel,
- d. adding a demulsifying agent and heating at a temperature sufficient to separate porous spherical silica particles from the oil,
- e. washing and optionally aging the particles, and
- f. drying the porous spherical silica particles.
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Dependencies are inferred from the claim text.