Use of monosodium iminodiacetic acid solutions in the preparation of N-phosphonomethyliminodiacetic acid

摘要

A method is described for making solution stable salts of iminodiacetic acid (IDA), useful as precursors in the manufacture of N-phosphonomethylglycine. Concentrated dialkali salts of IDA which are insoluble at temperatures below about 55 DEG C., such as the disodium salt (DSIDA) are acidified to monoalkali salts, such as monosodium IDA (MSIDA). The resulting salts are stable in solution, and may conveniently be stored or transported in solution without recourse to dilution, heating, or similar measures.