Fluid bed granulation of urea and related apparatus
US9884811B2 · kind B2 · utility
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Key dates
| Filing date | Dec 6, 2011 |
| Grant date | Feb 6, 2018 |
| Priority date | — |
| Expiry date | Jul 24, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C273/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for preparation of a granular urea product by granulating a urea solution in a fluidized bed, where the granulation process takes place along a substantially longitudinal growth path, from a granulation starting end (1S) to a product discharge end (1E) of said fluidized bed, and said urea solution enters the fluidized bed by means of several urea inputs (2A, 2B, 2C) taken from a main urea feed (2), where an additive (6) is mixed with said urea solution said additive has a non-uniform concentration in said urea inputs, so that at least two of said urea inputs have a different concentration of additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.