Synthesis of phosphonomethyliminodiacetic acid with reduced effluent
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United States of America Patent
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Sep 12, 2000
Grant Date -
N/A
app pub date -
Sep 1, 1999
filing date -
Sep 8, 1998
priority date (Note) -
Expired
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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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