Purification of spent ethylene glycol

Details Purification of spent ethylene glycol Purification of spent ethylene glycol

1977-01-17

1978-10-03

Thomas, Jr., James O.

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

Organic compounds

Carboxylic acid esters

560 79, 568871, C07C 6976, C07C 2924

Patent

active

041185820

ABSTRACT:
Spent ethylene glycol recovered from polyester manufacture contains dissolved antimony catalyst residues and other impurities. Prior to distillation of the spent glycol to recover purified ethylene glycol, the antimony compounds are removed by adjusting the pH of the spent glycol to about 2 to 7, preferably 5 to 7, preferably by adding an organic acid (e.g., acetic acid) adding an alkali metal borohydride (e.g., sodium borohydride) in the absence of oxygen and with intimate mixing to form a metallic antimony precipitate, and recovering the precipitate. The process is further improved by adding a catalytic amount of a strong inorganic base, e.g., sodium hydroxide, prior to the pH adjustment step, to convert any terephthalyl values to dihydroxyethyl terephthalate which can be recovered.

REFERENCES:
patent: 3878055 (1975-04-01), Cox et al.
patent: 4013519 (1977-03-01), Hoppert et al.
Jula, Inorganic Reductions with NaBH.sub.4, Ventron Corp., Chem. Div., Congress St., Beverly, Mass. (1974).
Ventron Corp. Technical Bul. No. 47-A, Ventron Corp., Chem. Div., Beverly, Mass.
Anon., "Chem. Absts.", vol. 81, 21894(g) 1974, citing Fed. Regist. 28(173), 24342-24344 (1973).

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