Urea granulation process
US-2021316261-A1 · Oct 14, 2021 · US
Urea granules comprising lignosulfonate coating
US11987535B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11987535-B2 |
| Application number | US-202217582751-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 24, 2022 |
| Priority date | Jul 12, 2018 |
| Publication date | May 21, 2024 |
| Grant date | May 21, 2024 |
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Abstract
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A process of granulation of a urea melt, comprising: adding a first additive containing carboxymethyl starch to one or more first stage(s) of the granulation process, to form a carcarboxymethyl starch containing inner layer of urea granules, and adding a second additive containing calcium lignosulfonate to one or more second stage(s) of the granulation process, downstream said first stages, to form granules with a coating containing calcium lignosulfonate.
First claim
Opening claim text (preview).
What is claimed is: 1. A urea granular product comprising granules made of at least 96% wt. urea with a layer containing carboxymethyl starch and a coating layer containing calcium lignosulfonate. 2. The urea product according to claim 1 , wherein the carboxymethyl starch containing layer has a thickness of 0.6 to 1.05 mm and the coating layer has a thickness of 0.1 to 0.2 mm. 3. The urea product according to claim 1 , wherein the carboxymethyl starch containing layer contains 0.1% to 0.8% in weight of carboxymethyl starch and the coating layer contains 0.3% to 1% in weight of calcium lignosulfonate. 4. The urea product according to claim 1 , wherein the urea product is obtainable with a process of granulation of a liquid urea melt containing at least 96% wt urea, the granulation process comprising: adding a first additive containing carboxymethyl starch to one or more first stage(s) of the granulation process; adding a second additive, which contains calcium lignosulfonate, to one or more second stage(s) of the granulation process; performing said one or more second stage(s) of the granulation process after said one or more first stage(s); wherein no amount of said first additive is added to said one or more second stage(s) of the granulation process.
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Classifications
- C05C9/005Primary
Post-treatment · CPC title
followed by coating of the granules (to prevent the granules sticking together B01J2/30) · CPC title
Coating of the granules without description of the process or the device by which the granules are obtained (to prevent the granules sticking together B01J2/30) · CPC title
in a gaseous medium {(if combined with suspending the material in a gas, e.g. fluidised beds B01J2/16)} · CPC title
by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain · CPC title
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- What does patent US11987535B2 cover?
- A process of granulation of a urea melt, comprising: adding a first additive containing carboxymethyl starch to one or more first stage(s) of the granulation process, to form a carcarboxymethyl starch containing inner layer of urea granules, and adding a second additive containing calcium lignosulfonate to one or more second stage(s) of the granulation process, downstream said first stages, to …
- Who is the assignee on this patent?
- Casale Sa
- What technology area does this patent fall under?
- Primary CPC classification C05C9/005. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 21 2024 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).