Preparation of ureaform

US4123570A · kind A · utility

Assignee

• Compagnie Neerlandaise de l'Azote · BE

Inventors

• Willy H. P. Van Hijfte · Assenede, BE
• Luc Vanmarcke · Eeklo, BE
• Anton Niks · Genk, BE

Key dates

• Filing date: Jun 29, 1977
• Grant date: Oct 31, 1978
• Expiry date: Jun 29, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C05C9/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Preparation of ureaform granules. A concentrated aqueous solution of a urea-formaldehyde condensate is mixed with a catalyst which at normal temperature effects virtually no acid condensation, but a elevated temperature releases sufficient strong acid to effect the acid condensation in a few seconds. The mixture of solution and catalyst is sprayed over solid ureaform particles maintained in spaced interrelationship and at such a temperature that the catalyst is decomposed and effects acid condensation, whereby the sprayed particles are coated with a layer of ureaform and dried.