The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 05, 2024
Filed:
May. 07, 2021
Sulzer Management Ag, Winterthur, CH;
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;
Erik Temmel, Basel, CH;
SULZER MANAGEMENT AG, Winterthur, CH;
Abstract
A method for preparing a purified styrene composition is provided. The method includes providing a crude composition and subjecting the crude composition to at least one crystallization step. The crude composition contains 70% by weight or more styrene based on the total weight of the crude composition. The at least one crystallization step comprises at least one of a static crystallization stage and a dynamic crystallization stage. The crude composition contains at least one impurity selected from the group consisting of: color inducing species, oxygenates, sulfur species, alpha-methylstyrene, and mixtures thereof.