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    • 4. 发明授权
    • Continuous process for the preparation of N-(phosphonomethyl)
iminodiacetic acid
    • 连续制备N-(膦酰基甲基)亚氨基二乙酸的方法
    • US6130351A
    • 2000-10-10
    • US373106
    • 1999-08-12
    • Michael K. SternTodd J. JohnsonAmy L. JorgensonMichael D. RogersThaddeus S. Franczyk, II
    • Michael K. SternTodd J. JohnsonAmy L. JorgensonMichael D. RogersThaddeus S. Franczyk, II
    • B01J20/26B01J20/34B01J31/20B01J31/40B01J38/00C07B61/00C07C233/47C07D241/08C07F9/38
    • C07D241/08C07C233/47C07F9/3808
    • A process for the production of N-(phosphonomethyl)iminodiacetic acid. N-(acetyl)iminodiacetic acid is formed in a amidocarboxymethylation reactor system, into which a source of each of the following is continuously fed: (1) acetamide or an acetamide derivative, (2) formaldehyde or a formaldehyde generator or derivative, (3) a carbonylation catalyst, (4) carbon monoxide, and optionally (5) hydrogen. In turn, an amidocarboxymethylation reaction product stream, which contains N-(acetyl)iminodiacetic acid and the carbonylation catalyst, is withdrawn from the amidocarboxymethylation reactor system. The carbonylation catalyst is separated from the amidocarboxymethylation reaction product stream to recover the carbonylation catalyst and form a catalyst depleted product stream which contains N-(acetyl)iminodiacetic acid. The separated carbonylation catalyst is returned to the amidocarboxymethylation reactor system, and the N-(acetyl)iminodiacetic acid in the catalyst depleted product stream is either: (1) reacted with a source of phosphorous and a source of formaldehyde in the presence of an acid to form a phosphonomethylation reaction product stream containing N-(phosphonomethyl)iminodiacetic acid and acetic acid; or (2) deacylated and cyclized to form a 2,5-diketopiperazine, and then reacted with a source of phosphorous and a source of formaldehyde in the presence of an acid to form a phosphonomethylation reaction product stream containing N-(phosphonomethyl)iminodiacetic acid and acetic acid. Either way, the N-(phosphonomethyl)iminodiacetic acid is precipitated from the phosphonomethylation reaction product stream in the presence of acetic acid, and the precipitate is recovered to form a filtrate stream.
    • 一种生产N-(膦酰基甲基)亚氨基二乙酸的方法。 在酰胺羧甲基化反应器系统中形成N-(乙酰基)亚氨基二乙酸,其中连续供给以下各项的源:(1)乙酰胺或乙酰胺衍生物,(2)甲醛或甲醛发生剂或衍生物,(3 )羰基化催化剂,(4)一氧化碳和任选的(5)氢。 反过来,含有N-(乙酰基)亚氨基二乙酸和羰基化催化剂的酰胺甲基甲基化反应产物流从酰胺羧甲基化反应器系统中排出。 从酰胺羧甲基化反应产物流中分离羰基化催化剂以回收羰基化催化剂并形成含有N-(乙酰基)亚氨基二乙酸的催化剂贫化产物流。 将分离的羰基化催化剂返回到酰胺羧甲基化反应器系统中,催化剂贫化产物流中的N-(乙酰基)亚氨基二乙酸是:(1)在酸存在下与磷源和甲醛源反应 以形成含有N-(膦酰基甲基)亚氨基二乙酸和乙酸的膦酰基甲基化反应产物流; 或(2)脱酰基并环化形成2,5-二酮哌嗪,然后在酸存在下与磷源和甲醛源反应,形成含有N-(膦酰基甲基)亚氨基二乙酸的膦酰基甲基化反应产物流 和乙酸。 无论哪种方式,在乙酸存在下,从膦酰基甲基化反应产物流中沉淀N-(膦酰基甲基)亚氨基二乙酸,并回收沉淀物以形成滤液流。