GB1148572A - Process for the production of coarse crystals of urea - Google Patents
Process for the production of coarse crystals of ureaInfo
- Publication number
- GB1148572A GB1148572A GB514066A GB514066A GB1148572A GB 1148572 A GB1148572 A GB 1148572A GB 514066 A GB514066 A GB 514066A GB 514066 A GB514066 A GB 514066A GB 1148572 A GB1148572 A GB 1148572A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- biuret
- crystals
- solution
- added
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1,148,572. Coarse crystals of urea. POWERGAS CORP. Ltd. 3 Feb., 1967 [5 Feb., 1966], No. 5140/66. Heading C2C. Coarse crystals of urea are obtained by crystallization from an aqueous urea solution containing 2-12% by wt. biuret and 0À1- 0-4% by wt. cyanuric acid, based on the wt. of an aqueous urea solution saturated at 60‹ C. Biuret and cyanuric acid may be added as such to the urea solution or may be added in admixture with urea, said mixture being obtained by thermal decomposition of urea at, e.g. 135-190‹ C. Crystallization may be effected by cooling and/or evaporation of water. The biuret content of the urea crystals, which is 3-5% by wt., may be reduced by washing with a saturated solution of urea. This washing liquid may be employed subsequently as the starting solution to which biuret and cyanuric acid are added. The crystallization process yields hexahedron crystals averaging 3 mm. in length and 1 mm. in width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB514066A GB1148572A (en) | 1966-02-05 | 1966-02-05 | Process for the production of coarse crystals of urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB514066A GB1148572A (en) | 1966-02-05 | 1966-02-05 | Process for the production of coarse crystals of urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1148572A true GB1148572A (en) | 1969-04-16 |
Family
ID=9790456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB514066A Expired GB1148572A (en) | 1966-02-05 | 1966-02-05 | Process for the production of coarse crystals of urea |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1148572A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994013630A1 (en) * | 1992-12-09 | 1994-06-23 | Sankt-Peterburgsky Gosudarstvenny Universitet | Process for obtaining carbamide |
| CZ305573B6 (en) * | 2011-11-23 | 2015-12-16 | Farid Alekovich Batullin | Process for preparing extremely pure crystalline carbamide |
-
1966
- 1966-02-05 GB GB514066A patent/GB1148572A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994013630A1 (en) * | 1992-12-09 | 1994-06-23 | Sankt-Peterburgsky Gosudarstvenny Universitet | Process for obtaining carbamide |
| CZ305573B6 (en) * | 2011-11-23 | 2015-12-16 | Farid Alekovich Batullin | Process for preparing extremely pure crystalline carbamide |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1256178A (en) | Melamine purification | |
| GB1148572A (en) | Process for the production of coarse crystals of urea | |
| US3404949A (en) | Process for the production of ammonium sulfamate | |
| GB767629A (en) | Improved process for the preparation of sodium bicarbonate and ammonium sulphate | |
| SU122742A1 (en) | Method of stabilizing cyanamide | |
| SU150105A1 (en) | Method of stabilizing cyanamide | |
| GB1041408A (en) | Improvements in or relating to the production of sodium bicarbonate | |
| GB1334871A (en) | Urea crystals pellets prills and the like | |
| GB1108302A (en) | Preparation of calcium peroxide | |
| GB1191493A (en) | Method for preparing Methylene Bis (Thiocyanate) | |
| GB1049464A (en) | Production of urea having good storage properties | |
| GB1322119A (en) | Recovery of ammonium sulphate | |
| GB1177856A (en) | Process for Resolution of Optical Isomers or Racemic Ammonium Pantoate by Preferential Crystallization | |
| GB1257270A (en) | ||
| SU112052A2 (en) | The method of decomposition of the double compound of glucose with sodium chloride upon receipt of crystalline glucose | |
| GB674496A (en) | Process for crystallising urea | |
| GB1135954A (en) | A process for producing monoammonium glutamate and monosodium glutamate therefrom | |
| GB1187808A (en) | Cooling Offgas obtained in the Synthesis of Melamine. | |
| SU115895A1 (en) | The method of obtaining adipic diamide and sigma-cyanovalsramid | |
| GB1148573A (en) | Process for the production of coarse crystals of urea | |
| GB1029132A (en) | Improvements in the production of crystals from solutions | |
| GB1165256A (en) | Trisorbitol Dihydrate and process for the preparation thereof | |
| ES322009A1 (en) | Procedure for the improvement in the processes of neutralization of acid solutions of caprolactama. (Machine-translation by Google Translate, not legally binding) | |
| GB1123078A (en) | Improvements in the manufacture of diammonium orthophosphate | |
| Lapworth et al. | CCLXIX.—Formation and decomposition of ketone cyanohydrins, with special reference to some compounds recently classified as such |