US 12,378,212 B2
Process for removing poly(propylene oxide) from propylene oxide by membrane separation
Johannes Leendert Willem Cornelis Den Boestert, Amsterdam (NL); and Adrianus Robert Storm, Moerdijk (NL)
Assigned to SHELL USA, INC., Houston, TX (US)
Appl. No. 17/769,790
Filed by SHELL USA, INC., Houston, TX (US)
PCT Filed Nov. 16, 2020, PCT No. PCT/EP2020/082227
§ 371(c)(1), (2) Date Apr. 18, 2022,
PCT Pub. No. WO2021/099255, PCT Pub. Date May 27, 2021.
Claims priority of application No. 19210455 (EP), filed on Nov. 20, 2019.
Prior Publication US 2022/0380327 A1, Dec. 1, 2022
Int. Cl. C07D 301/32 (2006.01)
CPC C07D 301/32 (2013.01) 6 Claims
OG exemplary drawing
 
1. Process for removing poly(propylene oxide) from propylene oxide, comprising:
a) sending a stream comprising propylene oxide and poly(propylene oxide) to a filtration screen having openings with an average diameter of at most 50 μm, wherein the filtration screen is a self-cleaning filtration (SCF) screen; and
b) sending the filtrate stream resulting from step a) to a membrane having an average pore size of from 0 to 30 nm and recovering a permeate stream from the membrane as a purified propylene oxide stream.