公开(公告)号：WO2019152980A1

公开(公告)日：2019-08-08

申请号：PCT/US2019/016631

申请日：2019-02-05

Applicant: LYONDELL CHEMICAL TECHNOLOGY, L.P.

Inventor： ROSS-MEDGAARDEN, Elizabeth I. ,  LEYSHON, David W. ,  RUFENER, Karl P. ,  KONGKITISUPCHAI, Sunti ,  WOLFF, Richard J. ,  PETRY, Kimberly A.

IPC: C07D301/32 ,  B01D3/32

CPC classification number: C07D301/32 ,  B01D3/008 ,  B01D3/143 ,  B01D3/40 ,  B01D3/4227

Abstract: A propylene oxide separation system comprising a heavies distillation column configured to receive a crude propylene oxide stream and discharge a heavies purge bottoms comprising at least one impurity selected from acetone, methanol, aldehydes, aldehyde derivatives, water, heavy hydrocarbons comprising C 5+ , or combinations thereof, and discharge a heavies distillation column overhead stream comprising a majority of the propylene oxide entering with the crude propylene oxide stream, and a first extractive distillation column configured to receive the heavies distillation column overhead stream and a first extraction solvent stream comprising a hydrocarbon solvent, and discharge a lights purge overhead comprising at least one impurity selected from aldehydes (e.g., acetaldehyde, formaldehyde, etc.) methyl formate, methanol, water, C 3 hydrocarbons, C 4 hydrocarbons, or combinations thereof, and discharge a rich solvent bottoms stream comprising a majority of the propylene oxide entering via the heavies distillation column overhead stream. A propylene oxide purification method is also provided.