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Manufacture of granular isobutylidenediurea

  • US 3,962,329 A
  • Filed: 10/25/1974
  • Issued: 06/08/1976
  • Est. Priority Date: 11/05/1973
  • Status: Expired due to Term
First Claim
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1. 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.

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