US 12,077,497 B2Granted

Process and apparatus for preparing purified styrene composition from styrene containing feedstock

AssigneeSulzer Management AG

InventorsRahul Khandelwal, Joseph C. Gentry, Randi Wytcherley, Kimberly Anderson, Meta Naulita-Ellis, Claudia Pudack, Celine Rioual, Christoph Kirschner, B. Bryant Slimp, Manfred Stepanski, Erik Temmel

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Abstract

A method for preparing a purified styrene composition with a styrene yield of at least 80%. The method comprises providing a crude composition containing styrene, and subjecting the crude composition to at least one crystallization step. The at least one crystallization step comprises at least one static crystallization stage and at least one dynamic crystallization stage.

Claims6

Dependent claims

A plant for preparing a purified styrene composition comprising at least one crystallization block, the crystallization block comprising:

at least one static crystallization section comprising one or more static crystallization stages,
at least one dynamic crystallization section comprising one or more dynamic crystallization stages, and
at least two conduits that fluidly couple at least one of the one or more static crystallization stages with at least one of the one or more dynamic crystallization stages.

Dependencies are inferred from the claim text.

Facts

Application: 18/531,135Filed 6 Dec 2023 · division
Priority: EP 202062246 Nov 2020
Published: US 2024/0132426 A125 Apr 2024
Granted: 3 Sep 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C07C 7/14
Purification; Separation; Use of additives: by crystallisation; Purification or separation of the crystals
C07C 15/46
The hydrocarbon substituent containing a carbon-to-carbon double bond: styrene; Ring-alkylated styrenes
B01D 3/143
Fractional distillation or use of a fractionation or rectification column: by two or more of a fractionation, separation or rectification step
B01D 3/40
With one or more auxiliary substances: extractive distillation

Family

Application63/022,109Us provisional application · filed 8 May 2020
PCT/EP2021/062213Parent of this division · filed 7 May 2021
US 2024/0132426 A1Pre-grant publication · published 25 Apr 2024
Application17/916,554Parent of this division
US 11,891,358 B2Parent of this division
US 2023/0174440 A1Published application
US 12,077,497 B2This patent

From the US filing history. Foreign family members aren’t listed.