Silica aggregate, adsorbent, adsorption column, cleaning system, method for treating liquid, and method for producing silica aggregate

Patent metadata

Field	Value
Publication number	US-11925918-B2
Application number	US-202016831548-A
Country	US
Kind code	B2
Filing date	Mar 26, 2020
Priority date	Sep 29, 2017
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

A silica aggregate includes primary silica particles aggregated, the primary silica particles having an average particle size of 1 nm or more and less than 10 nm, the primary silica particles being crosslinked to each other by a bond containing a siloxane bond.

First claim

What is claimed is:

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),

wherein R 1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 8 carbon atoms, R 3 , R 4 , R 5 , R 6 , and R 9 are each independently a monovalent hydrocarbon group having 1 to 8 carbon atoms, R 7 and R 8 are each independently a divalent hydrocarbon group, and R 2 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.

2. A silica aggregate containing aluminum oxide on at least a portion of a surface thereof, wherein the silica aggregate is manufactured by a 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),

wherein R 1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 8 carbon atoms, R 3 , R 4 , R 5 , R 6 , and R 9 are each independently a monovalent hydrocarbon group having 1 to 8 carbon atoms, R 7 and R 8 are each independently a divalent hydrocarbon group, and R 2 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.

Assignees

• Canon Kk

Inventors

• Kanazaki Kengo
• Yamauchi Fumio
• Sakakibara Teigo
• Kotani Yoshinori
• Ueyama Ryoko

Classifications

• B01J20/103 Primary

  comprising silica · CPC title

• B01D15/14 Primary

  relating to the introduction of the feed to the apparatus · CPC title

• B01J20/08

  comprising aluminium oxide or hydroxide; comprising bauxite · CPC title

• B01J20/24

  Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives · CPC title

• B01J20/28007

  with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like (carbon nanostructures B01J20/205) · CPC title