A preparation method of silica, especially superfine silica, with water glass and carbon dioxide as major raw materials in a carbonization reaction conducted under a high gravity field, typically in a Higee reactor.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part of copending International Application PCT/CN01/01554, with an international filing date of Nov. 14, 2001.
This invention relates to a process for converting silica to polysilicate gels or hydrogels by combining an aqueous silica source with a CO.sub.2 feed stream as the gel initiator, whereby the reaction stream is propelled at high velocity and turbulence maintaining the CO.sub.2 uptake rate in the reaction stream. The invention also relates to a process for converting silica to polysilicate by pre-carbonating water at pressures of equal to or greater than 100 psig before initiating the polysilicate reaction.
A method is provided for degassing a liquid. One step of the method includes providing a rotating packed bed (RPB) reactor. The RPB reactor includes a rotatable permeable element disposed within a chamber defining an interior region, at least one liquid inlet for infusing the liquid into the interior region, at least one gas outlet for removing a gas from the interior region, and at least one liquid outlet for removing a liquid from the interior region. The rotatable permeable element within the RPB reactor is caused to spin at a tangential velocity, and the liquid is then infused into the at least one liquid inlet at an inlet flow rate. Next, a vacuum is applied to the interior region of the RPB reactor via the at least one gas outlet to generate a liquid substantially free of the gas.
