GB819030A - Process for concentrating urea solutions - Google Patents
Process for concentrating urea solutionsInfo
- Publication number
- GB819030A GB819030A GB33438/57A GB3343857A GB819030A GB 819030 A GB819030 A GB 819030A GB 33438/57 A GB33438/57 A GB 33438/57A GB 3343857 A GB3343857 A GB 3343857A GB 819030 A GB819030 A GB 819030A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- temperature
- solution
- water
- per cent
- 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
- 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
A process for concentrating an aqueous solution of urea comprises bringing the solution into a chamber under a reduced pressure of less than 100 mm. of mercury, under such temperature conditions that the solution of urea is caused to separate into solid urea and water vapour, and the greater part of the water is removed from the chamber by carrying off such water while it is in the vapour state. The temperature is controlled so that the solid urea is melted and continuously discharged at a temperature of not more than 145 DEG C. and preferably between 132 DEG and 137 DEG C. The water vapour is carried off in countercurrent by a gas such as air, nitrogen, carbon dioxide or ammonia. In a typical example 600 kgs. per hour of 94.5 weight per cent of urea solution at a temperature of 122 DEG C. was admitted into a tubular steam jacketed evaporator of 2 mm. length and 30 cm. internal diameter at a pressure of 55 mm. of mercury. Water vapour was carried off at about 30 kgs. per hour and the melt was continously discharged at 136 DEG C. having a moisture content of 0.45 weight per cent and a biuret content of 0.7 per cent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL819030X | 1956-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB819030A true GB819030A (en) | 1959-08-26 |
Family
ID=19838993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33438/57A Expired GB819030A (en) | 1956-10-26 | 1957-10-25 | Process for concentrating urea solutions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB819030A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3147174A (en) * | 1959-10-14 | 1964-09-01 | Chemical Construction Corp | Low moisture urea melt |
| US4256662A (en) * | 1980-01-18 | 1981-03-17 | Gorlovsky David M | Process for producing urea |
-
1957
- 1957-10-25 GB GB33438/57A patent/GB819030A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3147174A (en) * | 1959-10-14 | 1964-09-01 | Chemical Construction Corp | Low moisture urea melt |
| US4256662A (en) * | 1980-01-18 | 1981-03-17 | Gorlovsky David M | Process for producing urea |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES447043A1 (en) | Process for producing sulfuric acid | |
| GB902713A (en) | Process of producing anhydrous urea | |
| GB1490228A (en) | Process for regenerating sulphuric acid | |
| GB630914A (en) | Process for the production of starch conversion products | |
| GB819030A (en) | Process for concentrating urea solutions | |
| ES2047656T3 (en) | PROCESS AND APPARATUS TO PREPARE COMPOSTE. | |
| GB1115952A (en) | Process for the separation of ammonia produced in medium and low pressure synthesizing plants | |
| ES8303389A1 (en) | Process for the isothermal absorption of ethylene oxide using film absorbers | |
| GB986503A (en) | Stable, storable crystalline potassium sorbate and process for its manufacture | |
| GB1434061A (en) | Process for purification | |
| GB1036822A (en) | A process for treating chlorine | |
| GB742386A (en) | Manufacture of ammonium bicarbonate | |
| ES238105A1 (en) | Process for the production of substantially anhydrous and substantially biuret-free urea | |
| GB892360A (en) | A process for the production of urea having a low water and biuret content | |
| NL175523C (en) | PROCESS FOR WINNING GUANIDINE CARBONATE. | |
| GB959385A (en) | Process and apparatus for the production of magnesium chloride | |
| GB916187A (en) | Process for the preparation of pure melamine | |
| GB760303A (en) | Improvements in or relating to apparatus for manufacture of chlorine dioxide hydrateand the like | |
| GB810760A (en) | A method for the preparation of a fertilizer containing urea and ammonium sulphate, with a high nitrogen content | |
| GB1038842A (en) | A method for producing shaped articles | |
| GB1287548A (en) | A process for purifying waste gases from the production of ammonium nitrite and re-using them for the production of ammonium carbonate | |
| GB757016A (en) | Process for the production of ammonium carbamate | |
| GB892564A (en) | Improvements in or relating to the production of hexamethylene diamine adipate | |
| GB771640A (en) | Improvements in or relating to production of isopropyl nitrate | |
| GB795424A (en) | Improvements in or relating to sodium cyanide |