Method for treating N-phosphonomethyliminodiacetic acid mother liquor
A treatment method, the technology of bisglyphosate mother, applied in the field of intermediate or tail liquid treatment, can solve the problems of poor economy and environmental protection, no simultaneous separation and utilization, etc., to save resource consumption, reduce waste water discharge, The effect of good economic benefits
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[0020] use as figure 1 Processing steps shown:
[0021] First take 105g of iminodiacetonitrile and add 416g (wt) 20% sodium hydroxide solution to carry out alkaline hydrolysis deamination, after the completion, add about 115g (wt) 31% hydrochloric acid, heat up distillation, separate the water, filter to obtain 560g of filtrate. Add phosphorous acid and formaldehyde to condense, (the molar ratio of materials is IDA:phosphorous acid:formaldehyde=1:1.1:1.2) After the heat preservation is over, add 300g of bottom water, add alkali to adjust pH=0.5, and obtain 212g of diglyphosate solid after crystallization , Obtain 850g of bis-glyphosate mother liquor.
[0022] Next, take 150 g of the mother liquor of bisglyphosate (taken from 850 g) and pass through HCl to obtain about 115 g of the mother liquor of salting out and about 37 g of salt (NaCl content 98%).
[0023] Then, get 105g of iminodiacetonitrile and add 416g (wt) 20% sodium hydroxide solution to carry out alkaline hydrolys...
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