Process for recovering ethylene oxide

Details Process for recovering ethylene oxide Process for recovering ethylene oxide

1994-12-01

1996-06-25

Warden, Robert J.

Distillation: processes, separatory

Including addition of water or steam

To distillation column

203 76, 203 92, 203 93, 203 97, 203DIG25, B01D 338

Patent

active

055296670

ABSTRACT:
In an improved process for recovering ethylene oxide from an aqueous ethylene oxide solution further containing formaldehyde is provided wherein the impure aqueous ethylene oxide solution is introduced into a distillation zone as a feed stream and undergoes distillation therein to form an ethylene oxide product sidestream and an aqueous bottoms product, water is added to the distillation zone to absorb formaldehyde vapor into a liquid phase and combines with the formaldehyde vapor to form an apparent azeotrope, and removing the apparent azeotrope from the column, the improvement is that all or part of the water is a recycled aqueous stream originating from the aqueous bottoms product and introduced to the distillation zone above the feed stream.

REFERENCES:
patent: 3165539 (1965-01-01), Lutz
patent: 3418338 (1968-12-01), Gilman et al.
patent: 3745092 (1973-07-01), Vanderwater
patent: 3964980 (1976-06-01), Ozero
patent: 4134797 (1979-01-01), Ozero
patent: 4966657 (1990-10-01), Delannoy et al.

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