US 11,925,918 B2
Silica aggregate, adsorbent, adsorption column, cleaning system, method for treating liquid, and method for producing silica aggregate
Kengo Kanazaki, Yokohama (JP); Fumio Yamauchi, Yokohama (JP); Teigo Sakakibara, Tokyo (JP); Yoshinori Kotani, Yokohama (JP); and Ryoko Ueyama, Yokohama (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 26, 2020, as Appl. No. 16/831,548.
Application 16/831,548 is a continuation of application No. PCT/JP2018/034573, filed on Sep. 19, 2018.
Claims priority of application No. 2017-192047 (JP), filed on Sep. 29, 2017.
Prior Publication US 2020/0230573 A1, Jul. 23, 2020
Int. Cl. B01J 20/10 (2006.01); B01D 15/14 (2006.01); B01J 20/08 (2006.01); B01J 20/24 (2006.01); B01J 20/28 (2006.01); B01J 20/283 (2006.01); B01J 20/286 (2006.01); B01J 20/30 (2006.01); B09B 3/10 (2022.01); B09B 101/30 (2022.01); C01B 33/18 (2006.01); C02F 1/28 (2023.01); C02F 101/20 (2006.01); C02F 103/08 (2006.01); C22B 11/00 (2006.01); G21F 9/12 (2006.01)
CPC B01J 20/103 (2013.01) [B01D 15/14 (2013.01); B01J 20/08 (2013.01); B01J 20/24 (2013.01); B01J 20/28007 (2013.01); B01J 20/28016 (2013.01); B01J 20/2803 (2013.01); B01J 20/28052 (2013.01); B01J 20/283 (2013.01); B01J 20/286 (2013.01); B01J 20/3028 (2013.01); B01J 20/3085 (2013.01); B09B 3/10 (2022.01); C01B 33/18 (2013.01); C02F 1/281 (2013.01); C02F 1/286 (2013.01); C02F 1/288 (2013.01); C22B 11/042 (2013.01); B01J 2220/52 (2013.01); B01J 2220/58 (2013.01); B09B 2101/30 (2022.01); C01P 2004/50 (2013.01); C01P 2004/61 (2013.01); C01P 2004/64 (2013.01); C02F 2101/20 (2013.01); C02F 2103/08 (2013.01); G21F 9/12 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for producing a silica aggregate containing primary silica particles aggregated, the method comprising:
preparing a dispersion of primary silica particles having an average particle size of 1 nm or more and less than 10 nm;
adding a solution containing at least one of:
a compound represented by at least one of the following formulae (1) to (5), or
a condensate resulting from partial hydrolysis of at least one of the compounds represented by the formulae (1) to (5),

OG Complex Work Unit Chemistry
wherein R1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 8 carbon atoms, R3, R4, R5, R6, and R9 are each independently a monovalent hydrocarbon group having 1 to 8 carbon atoms, R7 and R8 are each independently a divalent hydrocarbon group, and R2 is a divalent hydrocarbon group having 1 to 8 carbon atoms or a divalent group containing —NH—;
removing a dispersion medium from the dispersion; and
crosslinking the primary silica particles to each other,
wherein the silica aggregate contains aluminum oxide on at least a portion of a surface thereof.