Patent ID: 7465828
Filing Date: 2008-12-16
Classification: C07C

Abstract:
1. A method for preparing hydrazodicarbonamide comprising the steps of: obtaining metal monochlorobiuret salt having formula 2 or 3 by reacting a biuret having the formula 1 with a metal hypochloride, or by reacting the biuret having formula 1 with a chlorinating agent and a base; and reacting the obtained metal monochlorobiuret salt with ammonia, wherein the hydrazodicarbonamide is produced in the presence of a catalyst including bromine or iodine atom and generating bromine or iodine ion during the reaction, in the above formulas 2 and 3, M is a metal, and X is a chlorine ion (Cl), wherein the reaction solvent for preparing hydrazodicarbonamide from biuret is a mixture of water and a hydrophobic organic solvent.