Multi-Functionalized Basic Immobilized Amine Sorbents for Removal of Metal Contaminants from Wastewater
US-2021016246-A1 · Jan 21, 2021 · US
Purification of amines by adsorption using a super adsorbent
US12582964B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12582964-B2 |
| Application number | US-202218260872-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 21, 2022 |
| Priority date | Mar 23, 2021 |
| Publication date | Mar 24, 2026 |
| Grant date | Mar 24, 2026 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
The present invention describes a method to remove metals present in a mixture comprising one or more organic amines comprising the step of contacting the mixture with a silica-polyethyleneimine adsorbent.
First claim
Opening claim text (preview).
What is claimed is: 1 . A method to remove metal ions present in a mixture comprising one or more organic amines comprising the step of contacting the mixture with a silica-polyethyleneimine adsorbent. 2 . The claim 1 wherein the polyethyleneimine is a linear, branched, or dentrimer. 3 . The method of claim 1 wherein, the metal ions to be removed comprise at least one of Fe, Zn, Cr, Mn, Co, Ni, Cu, Cd, Li, Na, K, Mg, Ca, Sr, Ba, Al, Pb and Sb. 4 . The method of claim 1 wherein the organic amines are selected from the group consisting of Monoethanolamine (MEA), Diethanolamine (DEA), Triethanolamine (TEA), Monoisopropanolamine (MIPA), Diisopropanolamine (DIPA), Triisopropanolamine (TIPA), N-Methyldiethanolamine (MDEA), N-Methylethanolamine (NMEA), Ethylenediamine (EDA), Piperazine (PIP), Diethylenetriamine (DETA), Aminoethylethanolamine (AEEA), Aminoethylpiperazine (AEP), Triethylenetetramine (TETA), Tetraethylenepentamine (TEPA), dimethylethanolamine (DMEA), Polyethylene polyamines, Pentaethylenehexamine mixtures, and combinations thereof. 5 . The method of claim 1 wherein the mixture is passed through a fixed bed of silica-polyethyleneimine adsorbent. 6 . The method of claim 5 wherein the flow rate of the mixture through the bed is in a range from 1 to 30 BV per hour, where BV is the volume of the bed. 7 . The method of claim 6 where the flow rate of the mixture through the bed is in a range from 1 to 10 BV per hour. 8 . The method of claim 5 wherein the mixture is passed through two or more fixed beds of silica-polyethyleneimine adsorbent, wherein the two or more beds are arranged in parallel, series, or a combination of parallel and series circuits. 9 . The method of claim 8 wherein the two or more beds are arranged in parallel circuits. 10 . The method of claim 1 where the silica-polyethyleneimine adsorbent is added to the mixture and mixed. 11 . The method of claim 1 where the mixture is contacted with the silica-polyethyleneimine adsorbent at a temperature ranging from the freezing point of the mixture to just below the boiling point of the mixture. 12 . The method of claim 1 where the silica-polyethyleneimine adsorbent is washed with water or other solvent(s) prior to contacting the mixture. 13 . The method of claim 12 , where the silica-polyethyleneimine adsorbent is washed with water or other solvent(s) two or more times. 14 . The method of claim 1 where the silica-polyethyleneimine adsorbent is periodically regenerated by contacting the the adsorbent with a material to which the metal ions have a higher affinity comprising weak acid, weak acid aqueous solutions, or a comparatively stronger amine a weak acid or a weak acid aqueous solution, or a comparatively stronger amine. 15 . The method of claim 14 where the contacting material is a weak acid selected from the group consisting of acetic acid, formic acid, hydrocyanic acid, hydrofluoric acid, hydrogen sulfide, trichloracetic acid, or mixtures thereof. 16 . The method of claim 14 where the contacting material is ammonia. 17 . The method of claim 7 wherein the volume of the bed is configured to reduce the amount of a particular metal contaminant to a desired level given a desired flow rate. 18 . The method of claim 17 where the desired level of metal contaminant is less than 10 ppb.
Assignees
Inventors
Classifications
Use in several different columns · CPC title
Use in the form of a bed · CPC title
Regenerating or reactivating · CPC title
Sorbents specially adapted for preparative, analytical or investigative chromatography · CPC title
comprising silica · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12582964B2 cover?
- The present invention describes a method to remove metals present in a mixture comprising one or more organic amines comprising the step of contacting the mixture with a silica-polyethyleneimine adsorbent.
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- What technology area does this patent fall under?
- Primary CPC classification B01D15/36. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 24 2026 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).