GB574485A - Method of preparing cyanamide - Google Patents

Method of preparing cyanamide

Info

Publication number
GB574485A
GB574485A GB9573/43A GB957343A GB574485A GB 574485 A GB574485 A GB 574485A GB 9573/43 A GB9573/43 A GB 9573/43A GB 957343 A GB957343 A GB 957343A GB 574485 A GB574485 A GB 574485A
Authority
GB
United Kingdom
Prior art keywords
cyanamide
carbon dioxide
tank
calcium
june
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
Application number
GB9573/43A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wyeth Holdings LLC
Original Assignee
American Cyanamid Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by American Cyanamid Co filed Critical American Cyanamid Co
Publication of GB574485A publication Critical patent/GB574485A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C3/00—Cyanogen; Compounds thereof
    • C01C3/16—Cyanamide; Salts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

574,485. Cyanamide. AMERICAN CYANAMID CO. June 15, 1943, Nos. 9573 and 9574. Convention dates, June 12, 1942, and June 23, 1942. [Class 1 (ii)] Cyanamide is obtained by precipitating calcium from a slurry of calcium cyanamide, e.g., by means of carbon dioxide, sulphur dioxide or sulphuric acid, in an atmosphere of carbon dioxide the feed of calcium cyanamide being so regulated by a pH control. device that the solution is maintained at pH 4.0-7.2 and by a temperature controller to maintain the temperature at 0-55‹ C. Solid carbon dioxide is the preferred precipitant. The system as shown in Fig. 1, is charged with water or a weak solution of cyanamide from a previous operation. Calcium cyanamide is supplied from a feeding device 6 into a tank 7 in a line 8, and the resulting slurry passes through valves 9 and 16 and a feed line 4 into a storage tank 11 under the action of a pump 5. Carbon dioxide from a feeding device 10 is also passed into the tank 11. The mixed slurry passes into a stirred water-jacketted closed vessel 1 provided with a leg 12 submerged in liquid 13 for the escape of excess carbon dioxide, a pH controller 22 and a temperature controller 23. Controllers 22 and 23 are electrically connected with the motor which drives the calcium cyanamide feeder so as to stop the feed when the pH or temperature rises above the predetermined limit. The reaction magma leaves the vessel 1 by line 14. By operating a valve 17 part or all of the circulating magma may be passed through the tank 7. By closing the valve 16 and opening a valve 18 (preferably when a slurry containing 20-30 per cent. solids has been obtained), the reaction-magma may be passed to a filter 19, the filtrate being discharged into a container 21. The filtrate may be combined with wash water from the filter cake and returned to the apparatus for a further extraction. By making three such extractions the cyanamide concentration may reach about 25 per cent. while the dicyandiamide content is about 1.5 per cent.
GB9573/43A 1942-06-12 1943-06-15 Method of preparing cyanamide Expired GB574485A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US253009XA 1942-06-12 1942-06-12

Publications (1)

Publication Number Publication Date
GB574485A true GB574485A (en) 1946-01-08

Family

ID=21825214

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9573/43A Expired GB574485A (en) 1942-06-12 1943-06-15 Method of preparing cyanamide
GB19026/45A Expired GB606568A (en) 1942-06-12 1945-07-25 Improvements in or relating to the preparation of cyanamide

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB19026/45A Expired GB606568A (en) 1942-06-12 1945-07-25 Improvements in or relating to the preparation of cyanamide

Country Status (3)

Country Link
CH (2) CH253009A (en)
FR (2) FR912636A (en)
GB (2) GB574485A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105347362A (en) * 2015-12-07 2016-02-24 上海弗鲁克科技发展有限公司 System and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen
CN111686639A (en) * 2020-05-26 2020-09-22 平罗县祥美化工有限公司 Reaction device for reducing tail gas emission and method for producing cyanamide by using reaction device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300281A (en) * 1965-08-06 1967-01-24 American Cyanamid Co Method for manufacture of cyanamide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105347362A (en) * 2015-12-07 2016-02-24 上海弗鲁克科技发展有限公司 System and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen
CN111686639A (en) * 2020-05-26 2020-09-22 平罗县祥美化工有限公司 Reaction device for reducing tail gas emission and method for producing cyanamide by using reaction device

Also Published As

Publication number Publication date
CH262477A (en) 1949-06-30
CH253009A (en) 1948-02-15
FR912636A (en) 1946-08-14
GB606568A (en) 1948-08-17
FR56025E (en) 1952-09-11

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