GB492387A - Improvements in or relating to the manufacture of fertilizers - Google Patents
Improvements in or relating to the manufacture of fertilizersInfo
- Publication number
- GB492387A GB492387A GB852737A GB852737A GB492387A GB 492387 A GB492387 A GB 492387A GB 852737 A GB852737 A GB 852737A GB 852737 A GB852737 A GB 852737A GB 492387 A GB492387 A GB 492387A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium
- cyanamide
- urea
- calcium carbonate
- sulphuric acid
- 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)
- Fertilizers (AREA)
Abstract
Urea-calcium sulphate [4CO(NH2)2-CaSO4] is obtained by suspending calcium cyanamide in water, passing carbon dioxide therethrough to precipitate calcium as calcium carbonate and liberate free cyanamide, removing the calcium carbonate, mixing sulphuric acid with the cyanamide solution, the ratio of sulphuric acid to cyanamide being in the molecular proportions 1 : 4, converting the cyanamide to urea by heating and hydrolyzing, and then after concentrating the mixture, neutralizing it with the bye-product calcium carbonate thereby combining nascent calcium sulphate with the urea.ALSO:A fertilizer is obtained by suspending calcium cyanamide powder in water, passing carbon dioxide therethrough to precipitate calcium as calcium carbonate and liberate free cyanamide, removing the calcium carbonate, mixing sulphuric acid with the cyanamide solution, the ratio sulphuric acid to cyanamide being in the molecular proportions of 1 : 4 converting the cyanamide to urea by heating and hydrolysing, and then after concentrating the mixture, neutralizing it with the byeproduct calcium carbonate thereby combining nascent calcium sulphate with urea to form urea-calcium sulphate (4CO (NH2)2.CaSO4). The sulphuric acid employed may be waste acid containing amino acids, remaining after the preparation of glutamic acid by hydrolysing protein. A saturated solution of potassium nitrate, potassium chloride, or potassium sulphate may be added to the urea-calcium sulphate the resulting mixture being converted into a syrup by evaporation under reduced pressure, mixed with powdered aluminium phosphate, monocalcium phosphate or calcium superphosphate, broken into pieces after being kneaded, and dried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB852737A GB492387A (en) | 1937-03-23 | 1937-03-23 | Improvements in or relating to the manufacture of fertilizers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB852737A GB492387A (en) | 1937-03-23 | 1937-03-23 | Improvements in or relating to the manufacture of fertilizers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB492387A true GB492387A (en) | 1938-09-20 |
Family
ID=9854139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB852737A Expired GB492387A (en) | 1937-03-23 | 1937-03-23 | Improvements in or relating to the manufacture of fertilizers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB492387A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11299441B2 (en) | 2017-07-21 | 2022-04-12 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| CN115321925A (en) * | 2022-07-15 | 2022-11-11 | 嘉华特种水泥股份有限公司 | Cementing material for plant-growing concrete |
-
1937
- 1937-03-23 GB GB852737A patent/GB492387A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11299441B2 (en) | 2017-07-21 | 2022-04-12 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| US11352306B2 (en) | 2017-07-21 | 2022-06-07 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| US11802096B2 (en) | 2017-07-21 | 2023-10-31 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| US11912634B2 (en) | 2017-07-21 | 2024-02-27 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| CN115321925A (en) * | 2022-07-15 | 2022-11-11 | 嘉华特种水泥股份有限公司 | Cementing material for plant-growing concrete |
| CN115321925B (en) * | 2022-07-15 | 2023-03-31 | 嘉华特种水泥股份有限公司 | Cementing material for plant-growing concrete |
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