Recovery of guanidine carbonate from aqueous solutions

Details Recovery of guanidine carbonate from aqueous solutions Recovery of guanidine carbonate from aqueous solutions

D - Textiles, Paper

01

F

260/557.5

D01F 6/64 (2006.01)

Patent

CA 1038886

Recovery of Guanidine Carbonate from Aqueous Solutions ABSTRACT OF THE DISCLOSURE Guanidine carbonate is isolated from dilute aqueous solutions con- taining guanidine, urea, pyrolysis products of urea, ammonia and carbon dioxide, by evaporation of the solution at a temperature of 80° to 130° C until a guanidine carbonate content of 20g/l and a pyrolysis products content of not more than 28g/l at at 80° C or not more than 128° g/l at 30°C is achieved, without exceeding a heating time of 6 hours at the upper temperature limit, separation of the precipitated pyrolysis products, subsequent cooling to not more than 45° C, addition of ammonia to an ammonia content of 15 to 30 % by weight and separation of the precipitated guanidine carbonate, - 1 -

231064

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