| US 7,465,828 B2 | ||
| Method for preparing hydrazodicarbonamide using biuret as starting material | ||
| Chun-Hyuk Lee, Kyonggi-Do (Korea, Republic of); and Sang-Jin Han, Kyonggi-Do (Korea, Republic of) | ||
| Assigned to J&J Chemical Co., Ltd., (Korea, Republic of) | ||
| Filed on Dec. 17, 2004, as Appl. No. 11/15,853. | ||
| Application 11/015853 is a continuation of application No. PCT/KR02/01862, filed on Oct. 07, 2002. | ||
| Claims priority of application No. 2002-0033814 (KR), filed on Jun. 17, 2002. | ||
| Prior Publication US 2005/0107566 A1, May 19, 2005 | ||
| Int. Cl. C07C 281/06 (2006.01) | ||
| U.S. Cl. 564—35 [564/34] | 9 Claims |
| 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.
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