Conversion of iminodiacetic acid crystal liquors to...

Details Conversion of iminodiacetic acid crystal liquors to... Conversion of iminodiacetic acid crystal liquors to...

C - Chemistry, Metallurgy

07

C

260/523.1

C07C 227/18 (2006.01) C07C 227/38 (2006.01) C07C 229/24 (2006.01)

Patent

CA 2026532

ABSTRACT Conversion of iminodiacetic acid crystal liquors to solutions of monoalkalimetal or monoammonium iminodiacetate is disclosed. The process involves adjusting the pH of the IDA liquor to about 6-7 with an alkalimetal or ammonium base, and cooling the solution. Where the starting solution comprises substantial amounts of sodium sulfate, sodium sulfate decahydrate can be separated by cooling the solution to the saturation temperature of sodium sulfate decahydrate.

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