GB883319A - Improvements in or relating to the production of cyanamide - Google Patents
Improvements in or relating to the production of cyanamideInfo
- Publication number
- GB883319A GB883319A GB3152158A GB3152158A GB883319A GB 883319 A GB883319 A GB 883319A GB 3152158 A GB3152158 A GB 3152158A GB 3152158 A GB3152158 A GB 3152158A GB 883319 A GB883319 A GB 883319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- cyanamide
- cacn2
- filtrate
- concentrated
- 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
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/16—Cyanamide; Salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In a process for producing cyanamide in which calcium cyanamide is subjected to a carbon dioxide neutralization process to produce a dilute aqueous solution of CN.NH2, the Ca ion content of the solution is subsequently reduced to less than 0,2%. The reduction of the Ca ion content permits the solution to be concentrated without hydrolysis and dimerization of the CN.NH2. A slurry of CaCN2, in water, or an aqueous solution obtained by extracting CaCN2 with water, is neutralized with CO2 at atmospheric or elevated pressure, and precipitated solids are separated. CO2 treatment of the filtrate may be repeated. The filtrate is passed upwardly through a bed of cation exchange resin, e.g. of carboxylic acid type, to effect the Ca ion removal. The resulting solution may be concentrated at above 40 DEG C., e.g. 70 DEG -90 DEG C., to produce a solution of 70-90% from which crystalline CN.NH2 may be obtained on cooling, or under reduced pressure almost to dryness to obtain crystals.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US759128A US2982616A (en) | 1958-09-05 | 1958-09-05 | Method of producing calcium-free crystalline cyanamide |
| GB3152158A GB883319A (en) | 1958-10-02 | 1958-10-02 | Improvements in or relating to the production of cyanamide |
| DES60195A DE1094721B (en) | 1958-10-02 | 1958-10-08 | Process for the production of crystalline cyanamide or concentrated, aqueous solutions of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3152158A GB883319A (en) | 1958-10-02 | 1958-10-02 | Improvements in or relating to the production of cyanamide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB883319A true GB883319A (en) | 1961-11-29 |
Family
ID=10324330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3152158A Expired GB883319A (en) | 1958-09-05 | 1958-10-02 | Improvements in or relating to the production of cyanamide |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB883319A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3300281A (en) * | 1965-08-06 | 1967-01-24 | American Cyanamid Co | Method for manufacture of cyanamide |
| EP0347045A1 (en) * | 1988-05-18 | 1989-12-20 | Nippon Carbide Kogyo Kabushiki Kaisha | Process for producing cyanamide from calcium cyanamide |
| CN102936211A (en) * | 2012-11-13 | 2013-02-20 | 宁夏宝马化工集团有限公司 | Method for continuously producing dicyandiamide |
| CN110921682A (en) * | 2019-12-19 | 2020-03-27 | 山东益丰生化环保股份有限公司 | Purification method of cyanamide solution |
| CN111233005A (en) * | 2020-02-13 | 2020-06-05 | 宁夏嘉峰化工有限公司 | Cyanamide freeze concentration method |
| CN111994921A (en) * | 2020-08-04 | 2020-11-27 | 宁夏锦华化工有限公司 | Monocyanamide decoloring method |
-
1958
- 1958-10-02 GB GB3152158A patent/GB883319A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3300281A (en) * | 1965-08-06 | 1967-01-24 | American Cyanamid Co | Method for manufacture of cyanamide |
| EP0347045A1 (en) * | 1988-05-18 | 1989-12-20 | Nippon Carbide Kogyo Kabushiki Kaisha | Process for producing cyanamide from calcium cyanamide |
| US5017355A (en) * | 1988-05-18 | 1991-05-21 | Nippon Carbide Kogyo Kabushiki Kaisha | Process for producing cyanamide |
| CN102936211A (en) * | 2012-11-13 | 2013-02-20 | 宁夏宝马化工集团有限公司 | Method for continuously producing dicyandiamide |
| CN110921682A (en) * | 2019-12-19 | 2020-03-27 | 山东益丰生化环保股份有限公司 | Purification method of cyanamide solution |
| CN111233005A (en) * | 2020-02-13 | 2020-06-05 | 宁夏嘉峰化工有限公司 | Cyanamide freeze concentration method |
| CN111994921A (en) * | 2020-08-04 | 2020-11-27 | 宁夏锦华化工有限公司 | Monocyanamide decoloring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE3879T1 (en) | PRODUCTION OF FRUCTOSE AND USEFUL BY-PRODUCTS. | |
| GB883319A (en) | Improvements in or relating to the production of cyanamide | |
| GB1256178A (en) | Melamine purification | |
| KR910019961A (en) | Method of Purifying Glycine | |
| GB1530477A (en) | Ammonia absorption by acids | |
| GB341386A (en) | A process for producing calcium carbamate | |
| SU378382A1 (en) | METHOD OF OBTAINING COMPLEX BIOMINERAL FERTILIZER | |
| SU442180A1 (en) | The method of obtaining the combined peat-mineral fertilizer | |
| GB650341A (en) | Method for the production of amido sulphonic acid | |
| GB617778A (en) | Process of manufacturing basic calcium chlorate and basic calcium chloride from solutions containing both calcium chlorate and chloride | |
| GB1343847A (en) | Removal of non-sugar material from crude sugar solutions | |
| GB785979A (en) | Improvements in or relating to the production of lithium carbonate | |
| SU451641A1 (en) | The method of wastewater treatment from urea | |
| GB869948A (en) | Process for producing glutamic acid from fermentation broth | |
| GB628413A (en) | Improvements in or relating to ethylene cyanohydrin and method of producing same | |
| GB1346970A (en) | Preparation of lysine | |
| SU107150A1 (en) | The method of obtaining boron concentrate from natural brines | |
| SU114061A1 (en) | Method of producing nickel carbonyl | |
| SU145226A1 (en) | Method for producing boric acid | |
| SU138240A1 (en) | The method of purification of ammonium chloride | |
| GB795424A (en) | Improvements in or relating to sodium cyanide | |
| GB889647A (en) | Process for the purification and decolorization of pre-treated technical sugar solution | |
| GB592823A (en) | Process of hydrolysis of starch | |
| GB874580A (en) | A process for the production of l-malic acid | |
| Kogyo | Vanadium Recovery From the By-Product of Bayer Process |