METHOD FOR PREPARING HYDRAZOCARBONAMIDE WITH USING BIURET AS PARENT MATERIAL Russian patent published in 2006 - IPC C07C231/12 

FIELD: chemical technology.

SUBSTANCE: invention relates to synthesis of hydrazocarbonamide used as raw in producing foaming materials. Method for synthesis of hydrazocarbonamide involves the following steps: preparing monochlorobiuret metallic salt of the formula (2) or (3) wherein M means metal and X means chlorine atom by reaction of biuret of the formula (1) with metal hypochlorite or by reaction of biuret of the formula (1) with a chlorinating agent and a base, and reaction of synthesized monochlorobiuret metallic salt with ammonia. Hydrazocarbonamide is formed in the presence of catalyst comprising bromine or iodine atom and bromine or iodine ion formed in the process of the reaction and chosen from the group consisting of metal bromide, metal iodide, bromine-containing organic compound, iodine-containing organic compound and their mixtures. The amount of catalyst is from 0.001 to 1 mole per 1 mole of monochlorobiuret and/or monochlorobiuret metallic salt. As a solvent method involves using a mixture of water and hydrophobic organic solvent chosen from the group consisting of chlorinated hydrocarbon, aliphatic hydrocarbon, aromatic hydrocarbon, acetate, ether and their mixtures. Invention provides reducing time of the process, enhancing yield of the end product and improvement of economic and ecological indices.

EFFECT: improved method of synthesis.

6 cl, 7 tbl, 53 ex