Title:
SILICA SOL CONCENTRATION METHOD USING ULTRAFILTRATION
Document Type and Number:
WIPO Patent Application WO/2023/163169
Kind Code:
A1
Abstract:
[Problem] To provide a silica sol concentration method with which it is possible, when carrying out concentration by means of ultra filtration in order to increase the concentration of a silica component in a silica sol, to prevent the formation of aggregated silica particles in the concentrated silica sol. [Solution] A concentration method for a sol (silica sol) in which silica particles are dispersed in a dispersion medium as dispersoid particles, said silica sol concentration method being characterized by including a concentration step for increasing the concentration of the silica particles contained in the silica sol using an ultrafiltration device, and by requirement A and requirement B being satisfied during the concentration step. Requirement A: The solution temperature of the silica sol immediately before being poured into the ultrafiltration device being in the range from 0-45°C. Requirement B: The concentration of the silica particles contained in the silica sol after the concentration step being increased relative to before the concentration step as a result of allowing the silica sol to circulate in the ultrafiltration device.
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Inventors:
NISHIMURA TOHRU (JP)
MITSUI SHIGERU (JP)
MITSUI SHIGERU (JP)
Application Number:
PCT/JP2023/007039
Publication Date:
August 31, 2023
Filing Date:
February 27, 2023
Export Citation:
Assignee:
NISSAN CHEMICAL CORP (JP)
International Classes:
C01B33/141; B01D61/14; B01D61/16; C01B33/193
Domestic Patent References:
| WO2014188934A1 | 2014-11-27 |
Foreign References:
| JP2018524256A | 2018-08-30 | |||
| JPH0648719A | 1994-02-22 | |||
| JP2017071527A | 2017-04-13 | |||
| JP2002075929A | 2002-03-15 |
Attorney, Agent or Firm:
HANABUSA PATENT & TRADEMARK OFFICE (JP)
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