Synthesis of phosphonomethyliminodiacetic acid with reduced effl

Details Synthesis of phosphonomethyliminodiacetic acid with reduced effl Synthesis of phosphonomethyliminodiacetic acid with reduced effl

1999-09-01

2000-09-12

Vollano, Jean F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

562 16, C07F 938

Patent

active

06118022&

ABSTRACT:
A process for the preparation of phosphonomethylglycine in high yields is disclosed. In accordance with the process of the present invention, alkali metal IDA, such as disodium IDA, is reacted with a strong mineral acid, such as HCl, to convert the salt of IDA to IDA. The IDA is then converted to soluble IDA phosphite salt by the addition of phosphorous acid, and the alkali metal salt of the strong acid is precipitated. The phosphite salt of IDA is phosphonomethylated, such as by the addition of PCl.sub.3 and formaldehyde. Optionally, phosphorous trichloride can be hydrolyzed to provide the phosphorous acid source for phosphonomethylation of the phosphite salt.

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