Alkylene oxide separation systems, methods, and apparatuses
US8981133B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 7, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Apr 24, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D301/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The disclosure relates to a process for separating propylene oxide for a crude propylene oxide stream, for example an intermediate stream from a PO/TBA process. The crude propylene oxide stream can be passed through an extractive distillation column. The distillation column is operated at a pressure in a range of greater than 25 up to 50 psig, and/or at a temperature in a range of from 70 to 150 degrees Celsius using C8-C20 paraffin as extractive solvent with an overhead distillate water wash drum. The crude propylene oxide stream include from 0.001 to 0.1 wt % methanol, based on the total composition of the crude propylene oxide stream. The systems, methods, and apparatuses can produce a propylene oxide stream having less formaldehyde and acetaldehyde than the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.