US 11,891,358 B2
Process and apparatus for preparing purified styrene composition from styrene containing feedstock
Rahul Khandelwal, Katy, TX (US); Joseph C. Gentry, Houston, TX (US); Randi Wytcherley, Belgrade, MT (US); Kimberly Anderson, Bozeman, MT (US); Meta Naulita-Ellis, Bozeman, MT (US); Claudia Pudack, Zürich (CH); Celine Rioual, Chalampé (FR); Christoph Kirschner, Volketswil (CH); B. Bryant Slimp, Houston, TX (US); Manfred Stepanski, Buchs (CH); and Erik Temmel, Basel (CH)
Assigned to SULZER MANAGEMENT AG, Winterthur (CH)
Appl. No. 17/916,554
Filed by SULZER MANAGEMENT AG, Winterthur (CH)
PCT Filed May 7, 2021, PCT No. PCT/EP2021/062213
§ 371(c)(1), (2) Date Sep. 30, 2022,
PCT Pub. No. WO2021/224487, PCT Pub. Date Nov. 11, 2021.
Claims priority of provisional application 63/022,109, filed on May 8, 2020.
Claims priority of application No. 20206224 (EP), filed on Nov. 6, 2020.
Prior Publication US 2023/0174440 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 7/14 (2006.01); C07C 5/03 (2006.01); B01D 3/14 (2006.01); B01D 3/40 (2006.01); B01D 9/00 (2006.01); C07C 7/00 (2006.01); C07C 7/08 (2006.01)
CPC C07C 7/14 (2013.01) [B01D 3/143 (2013.01); B01D 3/40 (2013.01); B01D 9/0013 (2013.01); B01D 9/0031 (2013.01); B01D 9/0059 (2013.01); C07C 5/03 (2013.01); C07C 7/005 (2013.01); C07C 7/08 (2013.01); B01D 2009/0086 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for preparing a purified styrene composition with a styrene yield of at least 80%, the method comprising:
providing a crude composition containing styrene; and
subjecting the crude composition to at least one crystallization step to produce the purified styrene composition,
the at least one crystallization step comprising at least one static crystallization stage and at least one dynamic crystallization stage.