GB179544A - An improved process for the manufacture of salts of urea and more especially of nitrate of urea, starting from cyanamides - Google Patents

An improved process for the manufacture of salts of urea and more especially of nitrate of urea, starting from cyanamides

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Publication number
GB179544A
GB179544A GB12492/22A GB1249222A GB179544A GB 179544 A GB179544 A GB 179544A GB 12492/22 A GB12492/22 A GB 12492/22A GB 1249222 A GB1249222 A GB 1249222A GB 179544 A GB179544 A GB 179544A
Authority
GB
United Kingdom
Prior art keywords
nitrate
cyanamide
urea
calcium
ammonium
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
GB12492/22A
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.)
CHIMIQUES POUR L IND SOC ET
Original Assignee
CHIMIQUES POUR L IND SOC ET
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 CHIMIQUES POUR L IND SOC ET filed Critical CHIMIQUES POUR L IND SOC ET
Publication of GB179544A publication Critical patent/GB179544A/en
Expired legal-status Critical Current

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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
    • C07C273/06—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 from cyanamide or calcium cyanamide

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Urea salts are obtained by treating concentrated solutions of free cyanamide, obtained for example as described in Specification 151,597 and concentrated by repeating the process using the dilute cyanamide to dissolve further quantities of calcium cyanamide, with sulphuric acid, or other cheap acid, and a salt of the acid of which the urea salt is required; suitable salts are alkali, alkaline earth, and ammonium nitrates and chlorides, for example, those of sodium, potassium, magnesium and calcium. In an example sulphuric acid and ammonium or an alkali nitrate are used; the mixed product may be used directly as a manure, or urea nitrate crystallized out. The filtrate containing ammonium sulphate may be treated with calcium nitrate, filtered from plaster of paris, and evaporated for ammonium nitrate; or the mixture may be evaporated without filtering, for use as a manure.ALSO:Concentrated solutions of cyanamide are obtained from calcium cyanamide by multiple extraction, that is the calcium salt is decomposed, for example by carbon dioxide as described in Specification 151,597, [Class 2 (iii), Dyes &c.], and the dilute solution of cyanamide obtained is used to dissolve further quantities of calcium cyanamide. In an example of the process described for converting the cyanamide into urea, sulphuric acid and ammonium nitrate are employed. The urea nitrate is crystallized out and the filtrate containing ammonium sulphate may be treated with calcium nitrate, filtered from calcium sulphate and evaporated for ammonium nitrate.
GB12492/22A 1921-05-03 1922-05-03 An improved process for the manufacture of salts of urea and more especially of nitrate of urea, starting from cyanamides Expired GB179544A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH179544X 1921-05-03

Publications (1)

Publication Number Publication Date
GB179544A true GB179544A (en) 1923-07-12

Family

ID=4429349

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12492/22A Expired GB179544A (en) 1921-05-03 1922-05-03 An improved process for the manufacture of salts of urea and more especially of nitrate of urea, starting from cyanamides

Country Status (1)

Country Link
GB (1) GB179544A (en)

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