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N-膦酰基甲基甘氨酸的生产方法将N-膦酰基甲基亚氨基二乙酸在含Mn、Fe、Co、Cu或Ni的炭催化剂存在下,与氧气反应。生成N-膦酰基甲基甘氨酸。本发明通过催化剂及氧化剂控制氧化程度,使目标产物选择性好,收率高;通过对反应体系中甲醛的去除,使草甘膦或其盐质量稳定;通过对反应体系中杂质的除弃,反应母液可以套用5～6次,制取固体草甘膦不仅能耗低,而且收率高。
Production of N-phosphonomethylglycine N-phosphonomethyliminodiacetic acid is reacted with oxygen in the presence of a carbon catalyst containing Mn, Fe, Co, Cu or Ni. N-phosphonomethylglycine is formed. In the invention, the degree of oxidation is controlled by the catalyst and the oxidant, so that the target product has good selectivity and high yield; the quality of the glyphosate or the salt thereof is stabilized by the removal of the formaldehyde in the reaction system; the impurities in the reaction system are discarded, Reaction mother liquor can be applied 5 to 6 times, preparation of solid glyphosate not only low energy consumption, but also high yield.