Process for preparing aqueous colloidal silica sols of high purity from alkali metal silicate solutions
US-10065865-B2 · Sep 4, 2018 · US
Method for producing purified aqueous solution of silicic acid
US10865113B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10865113-B2 |
| Application number | US-201615768846-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 14, 2016 |
| Priority date | Oct 20, 2015 |
| Publication date | Dec 15, 2020 |
| Grant date | Dec 15, 2020 |
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Abstract
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There is provided a method for obtaining a purified aqueous solution of silicic acid containing less metal impurities such as Cu and Ni using water glass as a raw material with less number of purification steps than that in conventional methods without using any unnecessary additives. The method for producing a purified aqueous solution of silicic acid, the method comprising the steps of: (a) passing an aqueous solution of alkaline silicate having a silica concentration of 0.5% by mass or more and 10% by mass or less through a column filled with a polyamine-, iminodiacetic acid-, or aminophosphoric acid-type chelating resin, and (b) passing the aqueous solution passed in the step (a) through a column filled with a hydrogen-type cation exchange resin.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a purified aqueous solution of silicic acid, the method comprising the steps of: (a) passing an aqueous solution of alkaline silicate through a column filled with a polyamine-type chelating resin at a space velocity of 0.1 h −1 or more and 15 h −1 or less; and (b) passing the aqueous solution which has been passed in the step (a) through a column filled with a hydrogen-type cation exchange resin a space velocity of 0.1 h −1 or more and 15 h −1 or less for obtaining purified aqueous solution of silicic acid having silica concentration of 0.5% by mass or more and 10% by mass or less, wherein the purified aqueous solution of silicic acid that is obtained has 1-150 ppb of Cu and 1-50 ppb of Ni in terms of silica solid as metal impurities.
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Classifications
Abrasive particles per se (preparation of diamond C01B32/25) · CPC title
Concentration; Drying; Dehydration; Stabilisation; Purification {(C01B33/1465 takes precedence)} · CPC title
- C01B33/141Primary
Preparation of hydrosols or aqueous dispersions · CPC title
using ion exchangers · CPC title
in the weakly acidic form · CPC title
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- What does patent US10865113B2 cover?
- There is provided a method for obtaining a purified aqueous solution of silicic acid containing less metal impurities such as Cu and Ni using water glass as a raw material with less number of purification steps than that in conventional methods without using any unnecessary additives. The method for producing a purified aqueous solution of silicic acid, the method comprising the steps of: …
- Who is the assignee on this patent?
- Nissan Chemical Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C01B33/141. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 15 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).