Process for the preparation of iminodiacetonitrile and iminodiacetic acid
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United States of America Patent
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Aug 14, 1990
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N/A
app pub date -
Aug 14, 1989
filing date -
Aug 14, 1989
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Expired
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Abstract
An improved process is provided for producing iminodiacetonitrile by contacting ammonia, formaldehyde and hydrogen cyanide, or hexamethylenetetramine, formaldehyde and hydrogen cyanide in a reaction medium, the improvement which comprises the further steps of thereafter adjusting the pH of the reaction medium to a pH between about 5.5 and about pH 10 and heating the reaction medium to an elevated temperature for a sufficient time to convert by-products in the reaction medium to iminodiacetonitrile.
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