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  • Method for preparing hydrazodicarbonamide using biuret as starting material
    Patent number: 7465828
    Abstract: The method for preparing hydrazodicarbonamide (HDCA) using biuret as a starting material is disclosed. The method comprises the steps of; obtaining metal monohalobiuret salt by reacting a biuret with a metal hypohalogen compound, or by reacting the biuret with a halogenating agent and a base; and reacting the obtained metal monohalobiuret 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.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: December 16, 2008
    Assignee: J&J Chemical Co., Ltd.
    Inventors: Chun-Hyuk Lee, Sang-Jin Han