| 摘要 |
PURPOSE:To perform safe hydrogenation at a low cost under low pressure in high reduction rate using a highly reactive hydrogen storage alloy in reducing a nitrogen-atom-contg. compound such as nitro group-contg. compound, nitrile group-contg. compound, nitroso group-contg. compound, aldoxime or ketoxime. CONSTITUTION:A nitrogen-atom-contg. compound is reduced by catalytic hydrogenation with hydrogen released from a hydrogen storage alloy having, as the main phase, compounds with hexagonal CaCu5-type crystal structure containing rare earth element or Ca plus Ni as the essential elements. The compounds are e.g. (A) as the essential constituents, CaNi5, LaNi5, LaNi4.2, Al0.8, etc., containing >=50wt.% of the CaCu5-type crystal phase. With this method, using, as starting material, RNO2, RCN, RCHNOH, RNO, RNHNH2, etc., (R is atomic group), RNH2, RNHOH, RCH2NH2, RCH, etc., can be obtained. This process can be effected in high efficiency under highly safe conditions of a hydrogen gas pressure of <20kg/cm<2> without requiring any catalyst. |
