Process for preparing ethylene oxide
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United States of America Patent
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Issued Date -
May 19, 2005
app pub date -
Jun 21, 2004
filing date -
Dec 21, 2001
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a process for treating a mixture of impure ethylene oxide and of water in a ratio by weight of ethylene oxide to water of 0.1/1 to 4/1, comprising aldehyde impurities, formaldehyde and acetaldehyde, in order to obtain a purified ethylene oxide essentially free of water and of the aldehyde impurities. The process comprises (1) conveying the mixture to a first fractionation region Z1, while a liquid stream L1 comprising at least 98% by weight of water and a portion of the aldehyde impurities is withdrawn at the bottom of Z1, and a gas stream G1 comprising more than 99% by weight of ethylene oxide with residual amounts of water and of the aldehyde impurities is withdrawn at the top of Z1, and (2) conveying the gas stream G1 to a second fractionation region Z2, while a liquid stream L2 comprising a mixture of ethylene oxide, of water and of the aldehyde impurity(ies) is withdrawn at the bottom of Z2, a liquid stream L3 is withdrawn as a side stream from the region Z2 and is conveyed to the region Z1, and a gas stream G2 comprising the purified ethylene oxide is withdrawn at the top of Z2. The process is particularly suitable when it is combined with a process for the manufacture of ethylene oxide by gas-phase catalytic oxidation of ethylene by molecular oxygen.
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