US 12,338,215 B2
Process and apparatus for preparing purified styrene composition using divided-wall column and crystallization unit
Rahul Khandelwal, Katy, TX (US); Joseph C. Gentry, Houston, TX (US); Erik Temmel, Basel (CH); and Manfred Stepanski, Buchs (CH)
Assigned to Sulzer Management AG, Winterthur (CH)
Appl. No. 18/029,595
Filed by SULZER MANAGEMENT AG, Winterthur (CH)
PCT Filed Sep. 28, 2021, PCT No. PCT/EP2021/076672
§ 371(c)(1), (2) Date Mar. 30, 2023,
PCT Pub. No. WO2022/069479, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 20200620 (EP), filed on Oct. 7, 2020.
Prior Publication US 2023/0365480 A1, Nov. 16, 2023
Int. Cl. C07C 7/04 (2006.01); B01D 3/14 (2006.01); B01D 9/00 (2006.01); C07C 7/14 (2006.01)
CPC C07C 7/14 (2013.01) [B01D 3/141 (2013.01); B01D 9/0059 (2013.01); C07C 7/04 (2013.01); B01D 2009/0086 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for preparing a purified styrene composition, the method comprising:
providing a crude hydrocarbon composition containing styrene,
subjecting the crude hydrocarbon composition to a distillation in a divided-wall column to produce an overhead hydrocarbon stream, a bottom hydrocarbon stream, and a side hydrocarbon stream and
subjecting the side hydrocarbon stream to at least one crystallization step to obtain a purified styrene composition.