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US 3,962,329 AGranted
Manufacture of granular isobutylidenediurea
AssigneeBASF SE
InventorsGuenther Schoenaich, Otto Grabowsky, Johann Mayer, Guenther Matthias
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Abstract
The preparation of isobutylidenediurea from isobutyraldehyde and urea, the particle size of the product being controlled by alternate use of sulfuric acid and phosphoric acid.
Claims5
In a continuous process for the production of solid granular isobutylidene diurea by condensation of urea with isobutyraldehyde in the presence of a mineral acid, catalyst, the improvement consisting of repeatedly alternately adding phosphoric and sulfuric acid at different intervals of time to the continuous feed of the urea and isobutyraldehyde.
Dependencies are inferred from the claim text.