Purification of diethylene glycol monoethyl ether

Details Purification of diethylene glycol monoethyl ether Purification of diethylene glycol monoethyl ether

1998-11-24

2000-03-07

Killos, Paul J.

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

Organic compounds

Oxygen containing

C07L 4311

Patent

active

060342811

ABSTRACT:
The present invention provides a method for purifying diethylene glycol monoethyl ether, which is commonly known as Carbitol.TM. or Ethyl Carbitol.TM.. The method according to the present invention includes combining n-heptanol as an azeotrope-forming agent to crude diethylene glycol monoethyl ether which contains ethylene glycol as an impurity to form a mixture, subjecting the mixture to distillation whereby an overhead product comprising an azeotrope of ethylene glycol and n-heptanol and a bottoms product are produced, and recovering purified diethylene glycol monoethyl ether from the bottoms product. By practicing the method of the present invention, the ethylene gylcol content of diethylene glycol monoethyl ether can be reduced from thousands of parts per million to less than about twenty-five parts per million such that the purified diethylene glycol monoethyl ether is suitable for use as a solvent in pharmaceutical manufacturing applications.

REFERENCES:
patent: 4276126 (1981-06-01), Saffer
patent: 5425853 (1995-06-01), Berg
patent: 5507878 (1996-04-01), Flaningam et al.

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