Process for melamine purification
US-2021332017-A1 · Oct 28, 2021 · US
High-pressure reactor for the synthesis of melamine
US10155729B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10155729-B2 |
| Application number | US-201715838690-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 12, 2017 |
| Priority date | Mar 12, 2014 |
| Publication date | Dec 18, 2018 |
| Grant date | Dec 18, 2018 |
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- Title
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Abstract
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Reactor for the synthesis of melamine from urea, in accordance with the high-pressure non-catalytic process, comprising: a vertical reactor body ( 1 ), at least one inlet ( 2 ) for the urea melt, a set of heating elements ( 3 ), and a central duct ( 7 ), said set of heating elements ( 3 ) being arranged inside said central duct.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for the high-pressure synthesis of melamine from a urea feed, comprising a primary reaction stage in which urea is converted into melamine with an endothermic reaction, inside a vertical reactor, wherein said primary reaction stage is performed with a circulatory flow in a liquid mass comprising melamine and urea, said flow comprising: a descending flow through a central portion of said reactor, said flow being directly heated by heating elements installed in said central portion of said reactor and in contact with the liquid mass, and an ascending flow in a peripheral reaction zone which is arranged around said central portion and is without heating elements, the urea feed being introduced into said peripheral zone. 2. The process according to claim 1 , wherein the pressure is at least 70 bar. 3. The process according to claim 1 , wherein the pressure is between 70 and 250 bar.
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Classifications
Purification of melamine · CPC title
internally, i.e. the mixture circulating inside the vessel such that the upward stream is separated physically from the downward stream(s) · CPC title
Fingers · CPC title
Nozzle-type elements (nozzle-type reactors B01J19/26) · CPC title
- C07D251/60Primary
from urea or from carbon dioxide and ammonia · CPC title
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- What does patent US10155729B2 cover?
- Reactor for the synthesis of melamine from urea, in accordance with the high-pressure non-catalytic process, comprising: a vertical reactor body ( 1 ), at least one inlet ( 2 ) for the urea melt, a set of heating elements ( 3 ), and a central duct ( 7 ), said set of heating elements ( 3 ) being arranged inside said central duct.
- Who is the assignee on this patent?
- Casale Sa
- What technology area does this patent fall under?
- Primary CPC classification C07D251/60. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 18 2018 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).