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:
Feb. 11, 2014
Filed:
May. 24, 2006
Applicant:
Helmut Gehrke, Bergkamen, DE;
Inventor:
Helmut Gehrke, Bergkamen, DE;
Assignee:
Thyssenkrupp Uhde GmbH, Dortmund, DE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 7/08 (2006.01); C07C 5/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a method for extracting styrene, having a polymerization quality, from pyrolysis benzol fractions containing styrene by means of extractive distillation. The pyrolysis benzol fraction is separated in a separating wall column in a C-core fraction, a Cfraction and a C-fraction, the obtained C-core fraction is subjected to selective hydrogenation of the phenylacetylene CHwhich it contains. Subsequently, the obtained C-fraction undergoes extractive-distillative separation in a styrene fraction and a fraction which is low in styrene.