Production of ethylene oxide
View Patent ↗Process for the recovery of ethylene oxide (EO) from fat absorbent (FA) which comprises providing a feed of elevated temperature FA to an EO Stripper, providing a stripping gas feed and contacting the stripping gas feed at elevated temperature with the elevated temperature FA feed, obtaining stripped lean absorbent (LA) and an EO-containing gas, and providing one or more external process stream feeds to the EO Stripper at a location above the elevated temperature FA feed and at a lower temperature with respect to the elevated temperature FA feed thereby concentrating EO in the EO-containing gas. The process can also include one or more impurity removal stages in the form of one or more side draws from the EO Stripper or an EO Stripper Concentrator. The invention also includes an apparatus for performing the process.
1. A process for impurity removal in a process for the recovery of ethylene oxide (EO) from fat absorbent (FA) in an EO Stripper comprising:
providing an elevated temperature FA feed,
providing a stripping gas feed and contacting with the FA feed with the stripping gas feed at elevated temperature in the EO Stripper,
obtaining an overhead EO stream and a bottoms lean absorbent (LA) stream, and
removing impurities through one or more side draws from the EO Stripper.
2. The process of claim 1 , wherein the impurities have a relative volatility between that of EO and water.
3. The process of claim 2 , wherein hydrocarbon and chlorinated hydrocarbon impurities are removed.
4. The process of claim 2 , wherein a side draw feeds a side stripper having a stripped gaseous phase outlet for purified gases.
5. The process of claim 2 , wherein a side draw feeds a converter for converting EO and/or impurities.
6. The process of claim 5 , wherein the converter produces a waste water stream or an impurities-enriched stream.
7. The process of claim 4 , wherein the side stripper produces a waste water stream or an impurities-enriched stream.
8. The process of claim 1 , further comprising operating a reflux in the top of the EO Stripper.
9. The process of claim 1 , further comprising using EO from the EO stream to make ethylene glycols (EG).