METHODS FOR PRODUCING CHELATING AGENT-CONTAINING WATER GLASS AND SILICA SOL

WIPO Patent Application WO/2020/262406

A1

[Problem] To provide a method for heating anhydrous sodium silicate (cullet), a chelating agent, and water to obtain a sodium silicate aqueous solution and a method for producing a high-purity silica sol using the sodium silicate aqueous solution (water glass). [Solution] A method for producing a sodium silicate aqueous solution that heats and mixes anhydrous sodium silicate, a chelating agent, and water at 100-270°C. A method for producing a sodium silicate aqueous solution that heats and mixes anhydrous sodium silicate and a chelating agent-containing aqueous solution at 100-270°C. A method for producing a sodium silicate aqueous solution in which the chelating agent is 0.1-3000 ppm relative to SiO2. A method for producing a silica sol that includes a step (a): a step for bringing a sodium silicate aqueous solution obtained by the above production method into contact with a cation-exchange resin and obtaining an active silicic acid aqueous solution, a step (b): a step for heating the active silicic acid aqueous solution obtained in step (a) to obtain a silica sol, and a step (c): a step for ultrafiltering the silica sol obtained in step (b).

OIWAMOTO MASAKI (JP)
KOYAMA YOSHINARI (JP)
SUZUKI MUTSUKO (JP)
SHIKII KAZUAKI (JP)
MATSUMOTO TOMOYUKI (JP)

PCT/JP2020/024667

December 30, 2020

June 23, 2020

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NISSAN CHEMICAL CORP (JP)

C01B33/141; C01B33/32; C07C59/105; C07C229/16

JPH0481526B2	1992-12-24
JP2000247625A	2000-09-12
JPH055766B2	1993-01-25
JP2006036605A	2006-02-09
JP3691047B1	2005-08-31
JP3691048B1	2005-08-31

HANABUSA PATENT & TRADEMARK OFFICE (JP)

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