Recovery of IDA and Glauber's salt from waste crystal liquors

Details Recovery of IDA and Glauber's salt from waste crystal liquors Recovery of IDA and Glauber's salt from waste crystal liquors

1989-10-11

1991-04-30

Reamer, James H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C22742

Patent

active

050119885

ABSTRACT:
The separation and recovery of iminodiacetic acid and sodium sulfate decahydrate from sodium sulfate solutions such as the liquor generated in the production of iminodiacetic acids are disclosed. The separation is accomplished by adjusting the temperature of the sodium sulfate solutions to crystallize the iminodiacetic acid and sodium sulfate decahydrate. Nitrilotriacetic acid optionally can be isolated prior to the crystallization of the IDA and sodium sulfate decahydrate.

REFERENCES:
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patent: 3974496 (1976-03-01), Thunberg et al.
patent: 4299978 (1981-11-01), Nakayasu et al.
patent: 4691054 (1987-09-01), Tosa et al.
patent: 4818409 (1989-04-01), Puetter

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