Process for removing metal-EDTA complex and free EDTA salts from

Details Process for removing metal-EDTA complex and free EDTA salts from Process for removing metal-EDTA complex and free EDTA salts from

1977-12-30

1979-06-05

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing only nonpolymerized or nonpolymerizable material...

210500R, 210502, 528212, C08G 6546

Patent

active

041574346

ABSTRACT:
Ethylenediaminetetraacetic acid (EDTA)-complexed heavy metals alone or together with free EDTA salts are removed from solution in a mixture comprising a solvent for a polyphenylene ether resin, an antisolvent for a polyphenylene ether resin and water, by contacting the mixture with alumina for a time at least sufficient to selectively adsorb the metal-EDTA complex and free EDTA salts and recover the mixture of solvent, antisolvent and water substantially free of the metal-EDTA complex and EDTA salts. The alumina can be regenerated to nearly its full original adsorption capacity by contacting with water at a neutral or nearly neutral pH, to give an aqueous solution of the metal-EDTA complex and free EDTA salts.

REFERENCES:
patent: 3951917 (1976-04-01), Floryan et al.
Chem. Abstracts 53, 17629g, Centini et al. Gazz. Chim. Ital., 88, 607-616 (1958).
Chem. Abstracts, 58, 8534, Kavalerova et al., Zh. Fiz. Khim., 37, 226-227 (1963).

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