GB1113828A - Process for crystallizing urea - Google Patents
Process for crystallizing ureaInfo
- Publication number
- GB1113828A GB1113828A GB1367966A GB1367966A GB1113828A GB 1113828 A GB1113828 A GB 1113828A GB 1367966 A GB1367966 A GB 1367966A GB 1367966 A GB1367966 A GB 1367966A GB 1113828 A GB1113828 A GB 1113828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- slurry
- countercurrent flow
- mother liquor
- biuret
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/005—Post-treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
- C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
- C07C273/14—Separation; Purification; Stabilisation; Use of additives
- C07C273/16—Separation; Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Crystalline urea of low biuret content is obtained by removing urea crystals from a crystallization zone in a slurry having a mother liquor high in biuret content, passing the slurry vertically downward in an elutriator in countercurrent flow to an upward flow of an aqueous solution of urea of low biuret content, separating the crystals from the mother liquor and passing the slurry after the countercurrent flow from the upper portion of the elutriator to the crystallization step. A subatmospheric pressure may be maintained over said aqueous solution containing urea and biuret during the crystallization which may be effected at 130-160 DEG F., and the rising liquid phase during countercurrent flow is suitably maintained at 130-200 DEG F. The mother liquor of the slurry from the initial separation may be combined with make-up urea solution low in biuret content and recycled to the countercurrent flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1367966A GB1113828A (en) | 1966-03-28 | 1966-03-28 | Process for crystallizing urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1367966A GB1113828A (en) | 1966-03-28 | 1966-03-28 | Process for crystallizing urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1113828A true GB1113828A (en) | 1968-05-15 |
Family
ID=10027439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1367966A Expired GB1113828A (en) | 1966-03-28 | 1966-03-28 | Process for crystallizing urea |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1113828A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013055219A1 (en) * | 2011-10-14 | 2013-04-18 | Stamicarbon B.V. | Urea finishing method |
| CN105949087A (en) * | 2016-05-10 | 2016-09-21 | 安徽华瑞医药技术开发有限公司 | Medicinal urea and preparation method thereof |
-
1966
- 1966-03-28 GB GB1367966A patent/GB1113828A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013055219A1 (en) * | 2011-10-14 | 2013-04-18 | Stamicarbon B.V. | Urea finishing method |
| AP3926A (en) * | 2011-10-14 | 2016-12-10 | Stamicarbon | Urea finishing method |
| EA027106B1 (en) * | 2011-10-14 | 2017-06-30 | Стамикарбон Б.В. | Urea finishing method |
| US9890115B2 (en) | 2011-10-14 | 2018-02-13 | Stamicarbon B.V. | Urea finishing method |
| CN105949087A (en) * | 2016-05-10 | 2016-09-21 | 安徽华瑞医药技术开发有限公司 | Medicinal urea and preparation method thereof |
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