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GB9900/23A
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Individual
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Publication of GB196601ApublicationCriticalpatent/GB196601A/en
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
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Chemical & Material Sciences
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Organic Chemistry
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Agricultural Chemicals And Associated Chemicals
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Abstract
In the preparation of urea salts of mineral acids by the action of acids on solutions of cyanamide, the solution of cyanamide is gradually added to the acid to avoid local heating and the consequent formation of undesirable by-products, such as dicyandiamide.