Combined animal repellant and fertilizer composition
US-2015329435-A1 · Nov 19, 2015 · US
Encapsulated sustained release urea fertilizer
US10011536B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-10011536-B1 |
| Application number | US-201715710735-A |
| Country | US |
| Kind code | B1 |
| Filing date | Sep 20, 2017 |
| Priority date | Sep 20, 2017 |
| Publication date | Jul 3, 2018 |
| Grant date | Jul 3, 2018 |
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- Title
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Abstract
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The encapsulated sustained release urea fertilizer is a urea fertilizer and a stabilizer encapsulated in fumed silica. The stabilizer may be a gellan gum hydrogel or biochar. The encapsulated sustained release urea fertilizer allows for both immediate and sustained nitrogen release over time and displays reduced nitrogen volatilization and increased water holding capacity.
First claim
Opening claim text (preview).
We claim: 1. An encapsulated sustained release urea fertilizer, comprising a composition including: an aqueous solution of urea fertilizer, wherein the aqueous solution of urea fertilizer includes a stabilizer comprising gellan gum hydrogels thereby forming a stabilized urea solution; and fumed silica encapsulating the stabilized urea fertilizer solution. 2. The encapsulated sustained release urea fertilizer according to claim 1 , wherein said fumed silica comprises hydrophobic nanoparticles of fumed silica. 3. The encapsulated sustained release urea fertilizer according to claim 1 , wherein said urea fertilizer comprises 46% nitrogen by weight. 4. The encapsulated sustained release urea fertilizer according to claim 1 , wherein said fumed silica comprises 5% wt/vol of said composition. 5. The encapsulated sustained release urea fertilizer according to claim 1 , wherein said fumed silica comprises 10% wt/vol of said composition. 6. The encapsulated sustained release urea fertilizer according to claim 1 , wherein said stabilizer comprises up to 1% wt/vol of said composition. 7. The encapsulated sustained release urea fertilizer according to claim 6 , wherein said fumed silica comprises up to 10% wt/vol of said composition. 8. A process of making an encapsulated sustained release urea fertilizer, comprising the steps of: dissolving urea fertilizer in water to form a urea solution; adding a stabilizer to the urea solution, wherein the stabilizer comprises gellan gum hydrogels; adding fumed silica to the urea solution to form a pre-mix solution, wherein the stabilizer comprises 1% wt/vol of the pre-mix solution; and mixing the fumed silica and the stabilized urea solution for a period of time sufficient to encapsulate the urea solution in the fumed silica, thereby converting the urea solution into dry water form. 9. The process of making an encapsulated sustained release urea fertilizer according to claim 8 , wherein said mixing step comprises mixing the fumed silica and the urea solution at 14,000 rpm for ten seconds.
Assignees
Inventors
Classifications
Granulation (apparatus B01J2/00); Pelletisation; Stabilisation; Colouring · CPC title
- C05G5/37Primary
layered or coated with a polymer · CPC title
Other nitrogenous fertilisers · CPC title
Layered or coated, e.g. dust-preventing coatings · CPC title
- C05C9/02Primary
containing urea-formaldehyde condensates · CPC title
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- What does patent US10011536B1 cover?
- The encapsulated sustained release urea fertilizer is a urea fertilizer and a stabilizer encapsulated in fumed silica. The stabilizer may be a gellan gum hydrogel or biochar. The encapsulated sustained release urea fertilizer allows for both immediate and sustained nitrogen release over time and displays reduced nitrogen volatilization and increased water holding capacity.
- Who is the assignee on this patent?
- Univ King Saud
- What technology area does this patent fall under?
- Primary CPC classification C05G5/37. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 03 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).